ORCID Profile
0000-0002-7174-5590
Current Organisation
Swinburne University of Technology
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanomaterials | Water treatment processes | Communications Technologies | Maritime engineering | Manufacturing Engineering | Manufacturing Processes and Technologies (excl. Textiles) | Optical And Photonic Systems | Engineering/Technology Instrumentation | Metals and Alloy Materials | Biological control | Optics And Opto-Electronic Physics | Ship and platform structures (incl. maritime hydrodynamics) |
ANZSRC Socio-Economic Objective (SEO)
Education and Training Systems not elsewhere classified | Expanding Knowledge in Engineering | Industrial instrumentation | Scientific instrumentation | Coated Metal and Metal-Coated Products
Related Links
Publications
Strain-independent temperature measurement by use of a fluorescence intensity ratio technique in optical fiber
Publisher: Optica Publishing Group
Date: 20-06-2000
DOI: 10.1364/AO.39.003050
Abstract: The strain sensitivity of the fluorescence intensity ratio temperature-sensing technique has been measured to be (2 +/- 3) x 10(-4)%/muepsilon in Yb3+-doped fiber, implying a temperature-to-strain cross sensitivity of (2 +/- 3) x 10(-4) degrees C/muepsilon. The near-zero strain sensitivity means that this optical-fiber sensor technique is well suited for temperature measurement in strain-affected environments.
A comparison of the antifouling performance of air plasma spray (APS) ceramic and high velocity oxygen fuel (HVOF) coatings for use in marine hydraulic applications
Publisher: Informa UK Limited
Date: 18-05-2018
DOI: 10.1080/08927014.2018.1465052
Abstract: Maritime hydraulic components are often exposed to harsh environmental conditions which can lead to accelerated deterioration, reduced function, equipment failure and costly repair. Two leading causes of maritime hydraulic failure are biofouling accumulation and corrosion. This study examined the antifouling performance of three candidate replacement high velocity oxygen fuel (HVOF) coatings relative to the performance of the current baseline air plasma spray (APS) ceramic coating for protection of hydraulic actuators. Following 20 weeks immersion at tropical and temperate field exposure sites, the control APS ceramic accumulated significantly greater levels of biofouling compared to the HVOF coatings. More specifically, the magnitude of growth of real-world nuisance hard fouling observed on in-service hydraulic components (eg calcareous tubeworms and encrusting bryozoans) was significantly greater on the APS ceramic relative to HVOF coatings. Possible explanations for the observed patterns include differences in surface topography and roughness, the electrochemical potential of the surfaces and the colour/brightness of the coatings.
Effect of phase mask misalignment on alternative type of pi-phase-shifted FBGs at twice the Bragg wavelength
Publisher: IEEE
Date: 08-2011
Directional dependence of spectra of fiber bragg gratings due to excess loss
Publisher: Optica Publishing Group
Date: 11-2006
Abstract: The reflectance spectra of chirped fiber Bragg gratings can depend substantially on the direction from which the measurement is taken. The measured difference between forward and backward reflectance spectra measured in a linearly chirped grating was shown to be due to the measured excess loss. Simulation using the popular transfer-matrix model demonstrated that the observed asymmetric behavior could be obtained only when excess loss has an asymmetric spectral shape about the local Bragg wavelengths. Application of cladding mode excess losses to the result of a transfer-matrix model accounted for the experimental observation.
Bragg Grating-Based Fiber-Optic Laser Probe for Temperature Sensing
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2004
Stigmergy: A key driver of self-organization in bacterial biofilms.
Publisher: Informa UK Limited
Date: 09-11-2013
DOI: 10.4161/CIB.27331
Effect of test media on the crevice corrosion of stainless steel by sulfate reducing bacteria
Publisher: Springer Science and Business Media LLC
Date: 11-05-2022
DOI: 10.1038/S41529-022-00250-4
Abstract: The potential for crevice corrosion of UNS30400 stainless steel in the presence of sulfate-reducing bacteria (SRB) was studied in different media. Immersion studies found crevice corrosion to occur in test media supplemented with high chloride levels and SRB present for crevice gaps of ~3 μm. Electrochemical measurements showed high susceptibility to corrosion in this particular medium, demonstrated by a negative shift of open circuit potential, increased corrosion current and the lowest passivity breakdown potential. Overall, the results showed that test media can play a critical role in the crevice corrosion of stainless steel in the presence of SRB.
Ultraviolet direct domain writing on 1280 degrees YX-cut LiNbO3: for SAW applications
Publisher: IEEE
Date: 07-2013
Effects of high-temperature heat treatment on Nd3+-doped optical fibers for use in fluorescence intensity ratio based temperature sensing
Publisher: AIP Publishing
Date: 24-06-2003
DOI: 10.1063/1.1578706
Abstract: The effect of very high-temperature exposure on the measurement properties of a fluorescence intensity ratio based optical fiber temperature sensor, using Nd3+-doped fiber as the sensing material, has been investigated. The results obtained indicate that exposing the sensor material to 750 °C for 100 h improves the accuracy of the fluorescence intensity ratio versus temperature characteristics from approximately 2.5 to approximately 1.3 °C. Measurements of the refractive index profiles of Nd3+-doped fiber s les prior to and after exposure to 750 °C indicate that such exposure results in small but measurable changes in the refractive index profile.
Use of first-order diffraction wavelengths corresponding to dual-grating periodicities in a single fiber Bragg grating for simultaneous temperature and strain measurement
Publisher: SPIE
Date: 14-04-2008
DOI: 10.1117/12.786906
Infrared neural stimulation: Influence of stimulation site spacing and repetition rates on heating
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2013
Optical fiber sensors for high-temperature measurement using fluorescence techniques
Publisher: SPIE
Date: 15-12-2000
DOI: 10.1117/12.406363
Imaging of various optical fiber Bragg gratings using differential interference contrast microscopy: Analysis and comparison
Publisher: The Optical Society
Date: 26-01-2016
DOI: 10.1364/AO.55.000783
Effects of build orientation and heat treatment on microstructure, mechanical and corrosion properties of Al6061 aluminium parts built by cold spray additive manufacturing process
Publisher: Elsevier BV
Date: 08-2021
The effect of metal microstructure on the initial attachment ofEscherichia colito 1010 carbon steel
Publisher: Informa UK Limited
Date: 09-2013
DOI: 10.1080/08927014.2013.820826
Abstract: Metallurgical features have been shown to play an important role in the attachment of microorganisms to metal surfaces. In the present study, the influence of the microstructure of as-received (AR) and heat-treated (HT) 1010 carbon steel on the initial attachment of bacteria was investigated. Heat treatment was carried out with the aim of increasing the grain size of the carbon steel coupons. Mirror-polished carbon steel coupons were immersed in a minimal medium inoculated with Escherichia coli (ATCC 25922) to investigate the early (15, 30 and 60 min) and relatively longer-term (4 h) stages of bacterial attachment. The results showed preferential colonisation of bacteria on the grain boundaries of the steel coupons. The bacterial attachment to AR steel coupons was relatively uniform compared to the HT steel coupons where an increased number of localised aggregates of bacteria were found. Quantitative analysis showed that the ratio of the total number of isolated (i.e., single) bacteria to the number of bacteria in aggregates was significantly higher on the AR coupons than the HT coupons. Longer-term immersion studies showed production of extracellular polymeric substances by the bacteria and corrosion at the grain boundaries on both types of steel coupon tested.
Effect of sulphate-reducing bacteria on the microbiologically influenced corrosion of ten different metals using constant test conditions
Publisher: Elsevier BV
Date: 11-2017
Manufacturing of nickel based cermet coatings by the HVOF process
Publisher: Informa UK Limited
Date: 23-02-2016
Cross-correlation method to obtain temperature profiles from power reflection spectra of a chirped fiber Bragg grating
Publisher: SPIE
Date: 23-05-2005
DOI: 10.1117/12.624241
Changes in spectral properties of fibre Bragg gratings owing to bending
Publisher: Institution of Engineering and Technology (IET)
Date: 2011
DOI: 10.1049/EL.2011.0816
Implementation of integration of differences method for extraction of temperature profiles along chirped fibre Bragg gratings
Publisher: IEEE
Date: 07-2006
Ovarian stimulation strategies for intrauterine insemination in couples with unexplained infertility: a systematic review and individual participant data meta-analysis
Publisher: Oxford University Press (OUP)
Date: 18-05-2022
Abstract: Intrauterine insemination with ovarian stimulation (IUI-OS) is a first-line treatment for unexplained infertility. Gonadotrophins, letrozole and clomiphene citrate (CC) are commonly used agents during IUI-OS and have been compared in multiple aggregate data meta-analyses, with substantial heterogeneity and no analysis on time-to-event outcomes. In idual participant data meta-analysis (IPD-MA) is considered the gold standard for evidence synthesis as it can offset inadequate reporting of in idual studies by obtaining the IPD, and allows analyses on treatment–covariate interactions to identify couples who benefit most from a particular treatment. We performed this IPD-MA to compare the effectiveness and safety of ovarian stimulation with gonadotrophins, letrozole and CC and to explore treatment–covariate interactions for important baseline characteristics in couples undergoing IUI. We searched electronic databases including MEDLINE, EMBASE, CENTRAL, CINAHL, and PsycINFO from their inception to 28 June 2021. We included randomized controlled trials (RCTs) comparing IUI-OS with gonadotrophins, letrozole and CC among couples with unexplained infertility. We contacted the authors of eligible RCTs to share the IPD and established the IUI IPD-MA Collaboration. The primary effectiveness outcome was live birth and the primary safety outcome was multiple pregnancy. Secondary outcomes were other reproductive outcomes, including time to conception leading to live birth. We performed a one-stage random effects IPD-MA. Seven of 22 (31.8%) eligible RCTs provided IPD of 2495 couples (62.4% of the 3997 couples participating in 22 RCTs), of which 2411 had unexplained infertility and were included in this IPD-MA. Six RCTs (n = 1511) compared gonadotrophins with CC, and one (n = 900) compared gonadotrophins, letrozole and CC. Moderate-certainty evidence showed that gonadotrophins increased the live birth rate compared to CC (6 RCTs, 2058 women, RR 1.30, 95% CI 1.12–1.51, I2 = 26%). Low-certainty evidence showed that gonadotrophins may also increase the multiple pregnancy rate compared to CC (6 RCTs, 2058 women, RR 2.17, 95% CI 1.33–3.54, I2 = 69%). Heterogeneity on multiple pregnancy could be explained by differences in gonadotrophin starting dose and choice of cancellation criteria. Post-hoc sensitivity analysis on RCTs with a low starting dose of gonadotrophins (≤75 IU) confirmed increased live birth rates compared to CC (5 RCTs, 1457 women, RR 1.26, 95% CI 1.05–1.51), but analysis on only RCTs with stricter cancellation criteria showed inconclusive evidence on live birth (4 RCTs, 1238 women, RR 1.15, 95% CI 0.94–1.41). For multiple pregnancy, both sensitivity analyses showed inconclusive findings between gonadotrophins and CC (RR 0.94, 95% CI 0.45–1.96 RR 0.81, 95% CI 0.32–2.03, respectively). Moderate certainty evidence showed that gonadotrophins reduced the time to conception leading to a live birth when compared to CC (6 RCTs, 2058 women, HR 1.37, 95% CI 1.15–1.63, I2 = 22%). No strong evidence on the treatment–covariate (female age, BMI or primary versus secondary infertility) interactions was found. In couples with unexplained infertility undergoing IUI-OS, gonadotrophins increased the chance of a live birth and reduced the time to conception compared to CC, at the cost of a higher multiple pregnancy rate, when not differentiating strategies on cancellation criteria or the starting dose. The treatment effects did not seem to differ in women of different age, BMI or primary versus secondary infertility. In a modern practice where a lower starting dose and stricter cancellation criteria are in place, effectiveness and safety of different agents seem both acceptable, and therefore intervention availability, cost and patients’ preferences should factor in the clinical decision-making. As the evidence for comparisons to letrozole is based on one RCT providing IPD, further RCTs comparing letrozole and other interventions for unexplained infertility are needed.
Temperature profile measurements within a chirped fiber Bragg grating using a Fourier transform technique
Publisher: SPIE
Date: 23-05-2005
DOI: 10.1117/12.624247
Microbiologically Influenced Corrosion of Stainless Steel by Sulfate Reducing Bacteria: A Tale of Caution
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 02-04-2020
DOI: 10.5006/3467
Abstract: The influence of different experimental media composition and air purging on the potential for microbiologically influenced corrosion (MIC) of Type 304 stainless steel with sulfate-reducing bacteria (SRB) was investigated. Modified Baar’s (MB) medium, MB medium without iron ions and supplemented with sodium chloride (MBN), and air purged MBN medium (MBO) were used. Pitting corrosion attack was found on the surface of the coupons for all of the conditions tested including the abiotic tests, and detailed statistical analysis showed no significant difference between the pitting results. General corrosion and maximum pit penetration rates also showed no difference between the coupons exposed to different test conditions. Interestingly, the pits found on the surface of the coupons in all of the tested conditions were comparable in size/shape and depth to that of the inclusions present on the surface of the stainless steel coupons. These findings suggest that (i) the test conditions studied do not lead to increased corrosion rates of stainless steel with SRBs and (ii) care needs to be taken to avoid the pitfall of misinterpreting the corrosion of inclusions present on the surface of stainless steels, which can occur as a result of cleaning of the coupons, as MIC pits.
A π-phase-shifted fiber Bragg grating fabricated using a single phase mask
Publisher: IEEE
Date: 07-2009
On the need for more realistic experimental conditions in laboratory-based microbiologically influenced corrosion testing
Publisher: Elsevier BV
Date: 07-2017
Bragg grating performance in Er-Sn-doped germanosilicate fiber for simultaneous measurement of wide range temperature (to 500 °C) and strain
Publisher: AIP Publishing
Date: 28-10-2003
DOI: 10.1063/1.1619553
Abstract: A fiber-optic sensing scheme for the simultaneous measurement of strain and a wide range of temperatures has been investigated by combining the properties of the fiber Bragg grating (FBG) and the fluorescence from a rare-earth-doped photosensitive fiber. The temperature-dependent fluorescence peak power ratio of the two peaks occurring around 1535 nm and 1552 nm from the lified spontaneous emission due to the I13/24↔4I15/2 transitions in Er3+-doped tin–germanosilicate fiber, with 980 nm pumping, and the dual functionality of the FBG were exploited in this scheme. The sensor is based on a single FBG written in a small length (∼10 cm) of the above fiber, which can be used for the simultaneous measurement of strain and temperature over ranges of 0–1150 με and 22–500 °C, with root-mean-square errors of 36 με and 6 °C, respectively.
Modeling of bend effects on fiber Bragg gratings
Publisher: SPIE
Date: 31-01-2012
DOI: 10.1117/12.915939
Dependence of spectral features at 2/3 of the Bragg wavelength in a FBG upon the phase mask periodicity
Publisher: IEEE
Date: 06-2007
Dual temperature and strain sensor using a combined fiber Bragg grating and fluorescence intensity ratio technique in Er3+-doped fiber
Publisher: AIP Publishing
Date: 29-04-2003
DOI: 10.1063/1.1569406
Abstract: A prototype dual temperature–strain point sensor has been demonstrated by combining a short length of erbium-doped fiber in close proximity to a fiber Bragg grating. By measurement of the green fluorescence intensity ratio in erbium (Er3+) and the Bragg wavelength shift of a fiber Bragg grating the temperature and strain are deduced. Calibrations reveal that the sensitivity of the fluorescence intensity ratio in Er3+-doped fiber to strain is near zero. Three alternative analysis methods were used the conventional matrix method, and two variations of a technique that provides a better fit to the fluorescence intensity ratio temperature data using a quadratic. The quadratic methods considered two cases of the strain dependence of the fluorescence intensity ratio, namely, zero and linear. The matrix method showed standard deviations of 2.2 °C and 20.6 με, while the quadratic fit with a linear strain dependence yielded 1.0 °C and 22.9 με over temperature and strain ranges of 18–150 °C and 350–2534 με, respectively.
Fiber Bragg grating tether used to measure drag forces in neutral buoyancy flow tank tests
Publisher: AIP Publishing
Date: 06-2008
DOI: 10.1063/1.2937457
Abstract: The drag exerted on neutrally buoyant tethered spheres in a flow tank was measured as a function of flow rate. A unique solution to the problem was achieved using an optical fiber including a Bragg grating sensor as part of the tether. Measurements of the strain on the tether taken at flow rates between 0.14 and 0.33m∕s, were used to determine drag forces for spheres with diameters ranging from 40to100mm. Vortex-induced vibration was observed in tests performed at Reynolds numbers from 5×103to4.5×104. The drag coefficients for these tests were found to range from 0.51 to 0.77.
High Taxonomic Diversity in Ship Bilges Presents Challenges for Monitoring Microbial Corrosion and Opportunity To Utilize Community Functional Profiling
Publisher: American Society for Microbiology
Date: 26-08-2021
DOI: 10.1128/AEM.00890-21
Abstract: Microbially influenced corrosion (MIC) has been estimated to contribute 20 to 50% of the costs associated with corrosion globally. Diagnosis and monitoring of MIC are complex problems requiring knowledge of corrosion rates, corrosion morphology, and the associated microbiology to distinguish MIC from abiotic corrosion processes.
Investigation of wavelength variations of fibre Bragg grating features using a chirped phase mask
Publisher: IOP Publishing
Date: 04-04-2008
Incorporation of Fiber-Optic Sensors in Concrete Specimens: Testing and Evaluation
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2004
Comparison of spectra and images of Bragg gratings written in three different optical fibres
Publisher: IEEE
Date: 08-2011
The role of standards in biofilm research and industry innovation
Publisher: Elsevier BV
Date: 02-2023
Effect of strain on temperature measurements using the fluorescence intensity ratio technique (with Nd3+- and Yb3+-doped silica fibers)
Publisher: AIP Publishing
Date: 08-2001
DOI: 10.1063/1.1387250
Abstract: The effect of strain upon the fluorescence intensity ratio technique of optical fiber based temperature sensing has been investigated using a series of different Yb3+- and Nd3+-doped optical fibers. Measurements were conducted with each of the doped fibers for temperatures between approximately 10 and 140 °C and for strain values between 50 and 2100 με. Results suggest that the strain-temperature cross sensitivity for the fluorescence intensity ratio method is minimal, with an applied strain of 1000 με inducing temperature errors of less than 0.4 °C.
Ultraviolet laser-induced poling inhibition produces bulk domains in MgO-doped lithium niobate crystals
Publisher: AIP Publishing
Date: 09-2014
DOI: 10.1063/1.4895387
Abstract: We report the realization of high-resolution bulk domains achieved using a shallow, structured, domain inverted surface template obtained by UV laser-induced poling inhibition in MgO-doped lithium niobate. The quality of the obtained bulk domains is compared to those of the template and their application for second harmonic generation is demonstrated. The present method enables domain structures with a period length as small as 3 μm to be achieved. Furthermore, we propose a potential physical mechanism that leads to the transformation of the surface template into bulk domains.
Localized strain measurements using an integration method to process intensity reflection spectra from a chirped FBG
Publisher: SPIE
Date: 04-07-2007
DOI: 10.1117/12.738392
Modelling strain dependence of fluorescence from doped optical fibres: application to neodymium
Publisher: IEEE
Date: 2002
Variations of the growth of harmonic reflections in fiber Bragg gratings fabricated using phase masks
Publisher: The Optical Society
Date: 06-06-2012
High-temperature-resistant chemical composition Bragg gratings in Er 3+-doped optical fiber
Publisher: Optica Publishing Group
Date: 15-03-2005
DOI: 10.1364/OL.30.000607
Abstract: Chemical composition gratings (CCGs), unlike standard fiber Bragg gratings (FBGs), do not suffer a significant decrease in reflectance or an irreversible wavelength shift when they are exposed to elevated temperatures. To date, the growth of CCGs has been related to the fluorine content of the fibers in which they are written. It is shown that FBGs with high thermal stability, resembling CCGs, can be fabricated in Er3+-doped optical fibers that do not contain any fluorine.
Strain and temperature response of transmission dips at 2/3 of the Bragg wavelength in type I and IIA fiber Bragg gratings
Publisher: SPIE
Date: 23-05-2005
DOI: 10.1117/12.623413
Fiber optic sensor for dual measurement of temperature and strain using a combined fluorescence lifetime decay and fiber Bragg grating technique
Publisher: AIP Publishing
Date: 08-2001
DOI: 10.1063/1.1372171
Abstract: A fiber optic sensor device has been developed incorporating a short length of erbium doped fiber fused in close proximity to a single-fiber Bragg grating, to measure both the fluorescent lifetime decay and the wavelength shift in these respective elements, for temperature and strain determination. Calibration results obtained from this simple, low cost, intrinsic sensor scheme show standard deviation errors of 20.4 με and 1.2 °C over strain and temperature ranges of 22–1860 με and 25–120 °C, respectively.
Microbially influenced corrosion—Any progress?
Publisher: Elsevier BV
Date: 07-2020
Reflections near 1030 nm from 1540 nm fibre Bragg gratings: Evidence of a complex refractive index structure
Publisher: Elsevier BV
Date: 12-2005
A fibre optic corrosion fuse sensor using stressed metal-coated optical fibres
Publisher: Elsevier BV
Date: 05-2008
Stigmergy co-ordinates multicellular collective behaviours during Myxococcus xanthus surface migration.
Publisher: Springer Science and Business Media LLC
Date: 26-05-2016
DOI: 10.1038/SREP26005
Abstract: Surface translocation by the soil bacterium Myxococcus xanthus is a complex multicellular phenomenon that entails two motility systems. However, the mechanisms by which the activities of in idual cells are coordinated to manifest this collective behaviour are currently unclear. Here we have developed a novel assay that enables detailed microscopic examination of M. xanthus motility at the interstitial interface between solidified nutrient medium and a glass coverslip. Under these conditions, M. xanthus motility is characterised by extensive micro-morphological patterning that is considerably more elaborate than occurs at an air-surface interface. We have found that during motility on solidified nutrient medium, M. xanthus forges an interconnected furrow network that is lined with an extracellular matrix comprised of exopolysaccharides, extracellular lipids, membrane vesicles and an unidentified slime. Our observations have revealed that M. xanthus motility on solidified nutrient medium is a stigmergic phenomenon in which multi-cellular collective behaviours are co-ordinated through trail-following that is guided by physical furrows and extracellular matrix materials.
Fluorescence intensity ratio technique for optical fiber point temperature sensing
Publisher: AIP Publishing
Date: 30-09-2003
DOI: 10.1063/1.1606526
Abstract: The fluorescence intensity ratio technique for optical fiber-based point temperature sensing is reviewed, including the materials suitable for this technique. The temperature dependence of the fluorescence intensity ratio has been studied using thermally coupled energy levels in seven different rare earth ions doped into a variety of glasses and crystals. Sensor prototypes developed using Pr3+:ZBLANP, Nd3+-doped silica fiber and Yb3+-doped silica fiber as the sensing material have been used to measure temperatures covering the range of approximately −50 to 600 °C with a resolution of the order of 1 °C.
Understanding fiber Bragg gratings at harmonics of the Bragg wavelength through spectra and images
Publisher: SPIE
Date: 17-10-2012
DOI: 10.1117/12.974804
Corrosion of carbon steel by sulphate reducing bacteria: Initial attachment and the role of ferrous ions
Publisher: Elsevier BV
Date: 04-2015
Self-referenced point temperature sensor based on a fluorescence intensity ratio in Yb^3+-doped silica fiber
Publisher: Optica Publishing Group
Date: 11-1997
DOI: 10.1364/AO.36.008264
Abstract: An optical fiber temperature sensor, based on the fluorescence intensity ratio from the (2)F (5/2)(a) and (2)F(5/2)(b) Stark sublevels in ytterbium-doped silica fiber, has been investigated. Results of a sensor prototype demonstrate an accuracy near 1 degrees C in a 600 degrees C temperature range. Changes in the fluorescence intensity ratio because of variation in pump power, pump wavelength, and induced fiber bending loss are demonstrated to be small, supporting development of a practical sensor based on the technique described.
Development of a laboratory test for microbial involvement in accelerated low water corrosion
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MA18049
Abstract: Microbially influenced corrosion (MIC) is a general term for when microbes affect material corrosion processes. The rapid corrosion that can occur due to MIC can cause significant dangers and costs for owners of relevant assets in relation to predicting structural safety, design of new structures and maintenance. Verification and/or prediction that a structure may be subject to MIC is not straightforward and, when metal surfaces are involved, it requires a series of metallurgical, microbiological and chemical tests. A useful part of this testing can be laboratory-based studies of microbial consortium s les from the environment of interest. However, there are no standard guidelines for how to perform such tests. Here we report the results of a preliminary study of laboratory corrosion simulations with biomass from a marine metallic corrosion event and show that simple changes in the test conditions can alter the rate of corrosion and the composition of microbial consortia during the test.
Corrosion and mechanical performance of HVOF WC-based coatings with alloyed nickel binder for use in marine hydraulic applications
Publisher: Elsevier BV
Date: 07-2021
Effect of Multispecies Microbial Consortia on Microbially Influenced Corrosion of Carbon Steel
Publisher: MDPI AG
Date: 25-03-2021
DOI: 10.3390/CMD2020008
Abstract: Microbially influenced corrosion (MIC) is responsible for significant damage to major marine infrastructure worldwide. While the microbes responsible for MIC typically exist in the environment in a synergistic combination of different species, the vast majority of laboratory-based MIC experiments are performed with single microbial pure cultures. In this work, marine grade steel was exposed to a single sulfate reducing bacterium (SRB, Desulfovibrio desulfuricans) and various combinations of bacteria (both pure cultures and mixed communities), and the steel corrosion studied. Differences in the microbial biofilm composition and succession, steel weight loss and pitting attack were observed for the various test configurations studied. The sulfate reduction phenotype was successfully shown in half-strength marine broth for both single and mixed communities. The highest corrosion according to steel weight loss and pitting, was recorded in the tests with D. desulfuricans alone when incubated in a nominally aerobic environment. The multispecies microbial consortia yielded lower general corrosion rates compared to D. desulfuricans or for the uninoculated control.
Determination of the position of a localized heat source within a chirped fibre Bragg grating using a Fourier transform technique
Publisher: IOP Publishing
Date: 02-05-2006
Comparison between a simulated and measured image of a fibre Bragg grating
Publisher: IEEE
Date: 07-2006
Response of fiber Bragg grating transmission dips at twice the Bragg wavelength to transverse strain
Publisher: SPIE
Date: 05-10-2009
DOI: 10.1117/12.837539
Development of Processing Windows for HVOF Carbide-Based Coatings
Publisher: Springer Science and Business Media LLC
Date: 20-10-2016
Is marine sediment the source of microbes associated with accelerated low water corrosion?
Publisher: Springer Science and Business Media LLC
Date: 22-10-2018
DOI: 10.1007/S00253-018-9455-X
Abstract: Accelerated low water corrosion (ALWC) is a form of microbiologically influenced corrosion (MIC) associated with the degradation of marine structures around the low tide water level. A better understanding of the role of microbes in this degradation and the source of these microbes is required to improve the prediction and mitigation of the costly failures occurring due to ALWC. The microbial communities present in a sediment s le and on an ALWC tubercle on adjacent steel sheet piling from a tidal estuary were studied using culture-based isolation and metabarcoding. A total of 43 pure cultures were isolated from the sediment using a variety of culture conditions. Phylogenetic analysis of their 16S rRNA genes placed them in the Actinobacteria, Bacteroidetes, Firmicutes, and Proteobacteria (Alphaproteobacteria and Gammaproteobacteria). 16S rRNA gene metabarcoding of the sediment and tubercle revealed similar microbial groups at varying relative abundances. No Deltaproteobacteria were isolated from the sediment but they were present in both s les according to metabarcoding and their high abundance (49.3%) in the tubercle could indicate an important functional role. Although some sediment isolates and operational taxonomic units from the metabarcoding have previously been associated with surface colonisation or biofilm formation in MIC, there was no strong evidence for the notion that the sediment adjacent to ALWC was the source of tubercle microbes. Further isolation strategies and functional investigations of representative bacteria at different stages of corrosion are being carried out for additional laboratory-based corrosion studies.
Er:Yb doped fiber with embedded FBG for simultaneous point measurement of temperature and strain
Publisher: SPIE
Date: 09-06-2004
DOI: 10.1117/12.566524
The effect of size on the quantitative estimation of defect depth in steel structures using lock-in thermography
Publisher: AIP Publishing
Date: 15-05-2007
DOI: 10.1063/1.2732443
Abstract: An investigation into the effect of size on the quantitative estimation of defect depth in a steel specimen has been undertaken using lock-in thermography. Phase contrast measurements over circular defects of varying diameter and depth are presented for a range of excitation frequencies. It was found that the diameter of a defect had an appreciable effect on the observed phase angle which consequently has significant implications with regard to estimating defect depth. Phase contrast measurements for a range of defects in a 10mm steel specimen indicate that an excitation frequency of 0.02Hz is the optimal frequency for defect detection. Results obtained with an excitation frequency of 0.02Hz are used to discuss the limitations of determining the size and depth of defects. A finite element analysis was found to have good correlation with experimental data and thus demonstrates potential in providing improved estimates of defect depth.
Measurement of forces at the tip of a cochlear implant during insertion
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2014
Optical material processing by synchrotron radiation
Publisher: IEEE
Date: 07-2006
Fibre Bragg grating use in fluid dynamic studies
Publisher: SPIE
Date: 14-04-2008
DOI: 10.1117/12.785734
Combined fluorescence decay time and fiber Bragg grating temperature and strain sensing
Publisher: SPIE
Date: 30-10-2001
DOI: 10.1117/12.447329
Characteristics of doped optical fiber for fluorescence-based fiber optic temperature systems
Publisher: AIP Publishing
Date: 21-11-2003
DOI: 10.1063/1.1623624
Abstract: A series of investigations has been carried out into the performance characteristics of Er3+-doped fibers for their application in optical probes designed to incorporate fluorescence-based optical fiber sensors. Issues, such as probe length and annealing characteristics, are investigated and results reported on a series of fibers which are well suited to be used in probe construction.
Microbial Communities of Orange Tubercles in Accelerated Low-Water Corrosion
Publisher: American Society for Microbiology
Date: 17-06-2020
DOI: 10.1128/AEM.00610-20
Abstract: The presence of orange tubercles on marine steel pilings is often used as an indication that accelerated low-water corrosion is taking place. We studied the microbial communities in attached orange tubercles on two closely located sheet pilings that were of different steel types. The attached orange tubercles were visually similar, but the extents of underlying corrosion on the different steel surfaces were substantially different. No clear difference was found between the microbial communities present on the two different types of sheet piling. However, there were clear differences in the microbial communities in the corrosion layers of tubercles, which were also different from the microbes present in adjacent seawater. The overall results suggest that the presence of orange tubercles, a single measurement of water quality, or the detection of certain general types of microbes (e.g., sulfate-reducing bacteria) should not be taken alone as definitive indications of accelerated corrosion.
Use of first-order diffraction wavelengths corresponding to dual-grating periodicities in a single fibre Bragg grating for simultaneous temperature and strain measurement
Publisher: IOP Publishing
Date: 04-02-2009
Temperature independent bend measurement using a pi-phase shifted FBG at twice the Bragg wavelength
Publisher: SPIE
Date: 08-09-2010
DOI: 10.1117/12.866398
Infrared nerve stimulation: Modelling of photon transport and heat conduction
Publisher: SPIE
Date: 15-02-2013
DOI: 10.1117/12.2003477
An Investigation into the Surface Integrity of Micro-Machined Hard Cutting Tools
Publisher: MDPI AG
Date: 06-09-2023
Three parameter measurement using a single fiber Bragg grating inscribed in Er3+:Yb3+-codoped fiber
Publisher: SPIE
Date: 23-05-2005
DOI: 10.1117/12.623593
Effect of phase mask alignment on fiber Bragg grating spectra at harmonics of the Bragg wavelength
Publisher: The Optical Society
Date: 19-07-2012
Analysis of transmission mode of a matched fiber Bragg grating interrogation scheme
Publisher: The Optical Society
Date: 11-08-2010
DOI: 10.1364/AO.49.004498
Optical fibre Bragg gratings at harmonics of the Bragg wavelength and their sensing properties
Publisher: IOP Publishing
Date: 24-07-2013
Tailor-made domain structures on the x- and y-face of lithium niobate crystals
Publisher: Springer Science and Business Media LLC
Date: 25-09-2014
The Influence of Chemical Cleaning Methods on Pitting Morphology Attributed to Microbially Influenced Corrosion of Stainless Steels
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 30-11-2020
DOI: 10.5006/3707
Abstract: Chemical cleaning methods are frequently used for the removal of biofilm/corrosion products from metallic materials to evaluate the type and severity of microbially influenced corrosion (MIC) damage. The study described here investigates the effect of commonly applied cleaning treatments on the dissolution of stainless steel surface inclusions and emphasizes the potential impact of such treatments on MIC diagnostics. Polished 304 grade stainless steel coupons were ultrasonicated for 1 min, 3 min, and 7 min in each of the three commonly applied agents, i.e., Clarke’s, nitric acid, and hydrofluoric acid-based solutions. Post-treatment analyses of steel surfaces revealed pitting attack. For each treatment type and duration, the morphology and quantitative measurements of pits were recorded. Shape, size, and depth of examined pits closely resembled damage that, in many laboratory-based studies, have been attributed to MIC. The investigation herein demonstrates that caution ought to be exercised when implicating MIC as the cause of stainless steel pitting damage.
Characteristics of potential fibre Bragg grating sensor-based devices at elevated temperatures
Publisher: IOP Publishing
Date: 17-06-2003
An Investigation into the Surface Integrity of Micro-Machined High-Speed Steel and Tungsten Carbide Cutting Tools
Publisher: MDPI AG
Date: 22-10-2023
DOI: 10.3390/MI14101970
Effect of embedded optical fibres on the mechanical properties of cochlear electrode arrays
Publisher: Elsevier BV
Date: 02-2016
DOI: 10.1016/J.MEDENGPHY.2015.11.015
Abstract: Incorporating optical fibres in cochlear electrode arrays has been proposed to provide sensors to help minimise insertion trauma and also for the delivery of light in optical nerve stimulation applications. However, embedding an optical fibre into an electrode array may change its stiffness properties, which can affect the level of trauma during insertion. This report uses measurements of buckling and deflection force to compare the stiffness properties of a range of cochlear electrode arrays (Nucleus straight array, rat array, cat array and guinea pig array) with custom arrays containing an embedded optical fibre. The cladding diameters of the optical fibres tested were 125 µm, 80 µm and 50 µm. The results show that the stiffness of the optical-fibre-embedded arrays is related to the diameter of the optical fibre. Comparison with wired arrays suggests optical fibres with a diameter of 50 µm could be embedded into an electrode array without significantly changing the stiffness properties of the array.
Temperature and strain measurement using a combined fiber Bragg grating and fluorescence intensity ratio technique in Er3+-doped fiber
Publisher: IEEE
Date: 2002
Investigating strain transfer in polymer coated structures for the health monitoring of aerospace vehicles using polymer photonic waveguides
Publisher: IEEE
Date: 05-2014
Strain-imposed fiber optic laser-based system for wide range temperature measurement applications
Publisher: SPIE
Date: 03-06-2005
DOI: 10.1117/12.606166
Inhibition or acceleration: Bacterial test media can determine the course of microbiologically influenced corrosion
Publisher: Elsevier BV
Date: 09-2014
Origins of spectral changes in fiber bragg gratings due to macrobending
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2012
Occurrence of features of fiber Bragg grating spectra having a wavelength corresponding to the phase mask periodicity
Publisher: IEEE
Date: 08-2008
Influence of carbon steel grade on the initial attachment of bacteria and microbiologically influenced corrosion
Publisher: Informa UK Limited
Date: 02-01-2016
DOI: 10.1080/08927014.2015.1128528
Abstract: The influence of the composition and microstructure of different carbon steel grades on the initial attachment (≤ 60 min) of Escherichia coli and subsequent longer term (28 days) corrosion was investigated. The initial bacterial attachment increased with time on all grades of carbon steel. However, the rate and magnitude of bacterial attachment varied on the different steel grades and was significantly less on the steels with a higher pearlite phase content. The observed variations in the number of bacterial cells attached across different steel grades were significantly reduced by applying a fixed potential to the steel s les. Longer term immersion studies showed similar levels of biofilm formation on the surface of the different grades of carbon steel. The measured corrosion rates were significantly higher in biotic conditions compared to abiotic conditions and were found to be positively correlated with the pearlite phase content of the different grades of carbon steel coupons.
Rare-earth doped optical fiber approach to an alarm system for fire and heat detection
Publisher: AIP Publishing
Date: 2003
DOI: 10.1063/1.1527203
Abstract: A fluorescence based optical fiber fire alarm system has been further refined in this work to determine the presence of a localized temperature excursion (as low as 50–100 °C) against a varying background at temperatures up to 500–600 °C.
Improved methods for fluorescence background subtraction from Raman spectra
Publisher: Wiley
Date: 02-09-2013
DOI: 10.1002/JRS.4371
Modeling of light absorption in tissue during infrared neural stimulation
Publisher: SPIE-Intl Soc Optical Eng
Date: 06-07-2012
Infrared neural stimulation fails to evoke neural activity in the deaf guinea pig cochlea.
Publisher: Elsevier BV
Date: 06-2015
DOI: 10.1016/J.HEARES.2015.03.005
Abstract: At present there is some debate as to the processes by which infrared neural stimulation (INS) activates neurons in the cochlea, as the lasers used for INS can potentially generate a range of secondary stimuli e.g. an acoustic stimulus is produced when the light is absorbed by water. To clarify whether INS in the cochlea requires functioning hair cells and to explore the potential relevance to cochlear implants, experiments using INS were performed in the cochleae of both normal hearing and profoundly deaf guinea pigs. A response to laser stimulation was readily evoked in normal hearing cochlea. However, no response was evoked in any profoundly deaf cochleae, for either acute or chronic deafening, contrary to previous work where a response was observed after acute deafening with ototoxic drugs. A neural response to electrical stimulation was readily evoked in all cochleae after deafening. The absence of a response from optical stimuli in profoundly deaf cochleae suggests that the response from INS in the cochlea is hair cell mediated.
Direct writing of ferroelectric domains on strontium barium niobate crystals using focused ultraviolet laser light
Publisher: AIP Publishing
Date: 30-09-2013
DOI: 10.1063/1.4823702
Abstract: We report ferroelectric domain inversion in strontium barium niobate (SBN) single crystals by irradiating the surface locally with a strongly focused ultraviolet (UV) laser beam. The generated domains are investigated using piezoresponse force microscopy. We propose a simple model that allows predicting the domain width as a function of the irradiation intensity, which indeed applies for both SBN and LiNbO3. Evidently, though fundamentally different, the domain structure of both SBN and LiNbO3 can be engineered through similar UV irradiation.
Strain-independent temperature measurement using a type-l and type-IIA optical fiber Bragg grating combination
Publisher: AIP Publishing
Date: 26-04-2004
DOI: 10.1063/1.1711155
Abstract: A simple and effective technique for strain-independent temperature measurement has been demonstrated using the peak wavelengths of both type-I and type-IIA fiber Bragg gratings written without hydrogen loading in the same fiber, this having been specially fabricated with a high concentration of germanium in the core composition. The device is also capable of monitoring strain and temperature simultaneously and can be used to measure temperature over the range of 25–300 °C with a strain range of 0–500 με, achieving a temperature-dependent sensitivity of 0.53 and 0.31 pm/°C for strain-independent temperature measurement with root mean square errors of 2.4 and 4.1 °C at 25 and 300 °C, respectively.
Quantitative investigation of the refractive-index modulation within the core of a fiber Bragg grating
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.010332
Abstract: A comparison is made between the modeled and experimentally determined microscopic images of a type I Bragg grating produced in the core of an optical fiber using the ultraviolet irradiation of a phase mask. The simulated image of the refractive-index distribution, which assumes a linear relationship between the irradiation intensity and the refractive-index change, is in good agreement with the measured image.
Tailor-made domain structures on the x-face and y-face of LiNbO3 crystals
Publisher: IEEE
Date: 12-2012
Silica optical fibre based rare-earth doped sensors
Publisher: SPIE
Date: 30-10-2001
DOI: 10.1117/12.447346
A wide temperature tunable fibre laser using a chirped grating and a type IIA fibre Bragg grating
Publisher: IOP Publishing
Date: 14-05-2004
Intragrating strain sensing using a chirped FBG and an integration method
Publisher: IEEE
Date: 06-2007
Investigation of the photosensitivity, temperature sustainability and fluorescence characteristics of several Er-doped photosensitive fibers
Publisher: Elsevier BV
Date: 07-2004
Er3+: Yb3+ doped fibre with embedded FBG for simultaneous measurement of temperature and longitudinal strain
Publisher: IOP Publishing
Date: 22-01-2005
Response of some pi-phase-shifted Bragg gratings to elevated pressure
Publisher: SPIE
Date: 15-05-2011
DOI: 10.1117/12.886440
An efficient, cost-effective method for determining the growth rate of sulfate-reducing bacteria using spectrophotometry
Publisher: Elsevier BV
Date: 2019
Bragg gratings written in Sn-Er-Ge-codoped silica fiber: Investigation of photosensitivity, thermal stability, and sensing potential
Publisher: Optica Publishing Group
Date: 08-2004
Abstract: Bragg gratings were fabricated in an Sn-Er-Ge-codoped silica fiber with a phase mask and ultraviolet radiation from a 248-nm KrF excimer laser. The photosensitivity of the fiber was examined by studying the initial growth rate of the gratings written into it. The thermal stability of the gratings was investigated and modeled in terms of both the refractive-index modulation and the effective refractive index of the fiber core. It was shown that the temperature-induced irreversible shift in the Bragg wavelength could not be predicted by the isothermal decay of the refractive-index modulation. Finally, the potential of the gratings written into the fiber is discussed in terms of their use in high-temperature-sensing applications.
Dual temperature and strain measurement with the combined fluorescence lifetime and Bragg wavelength shift approach in doped optical fiber
Publisher: Optica Publishing Group
Date: 11-2002
DOI: 10.1364/AO.41.006585
Abstract: We have constructed fiber-optic sensors to measure temperature and strain by combining the properties of fiber Bragg gratings with the fluorescent lifetimes of various doped fibers. Sensors have been made with the fiber Bragg grating written directly into the doped fiber to ensure the collocation of the strain and temperature measurement points. Results are compared with those obtained previously from a Bragg grating written into standard photosensitive fiber spliced to doped fiber. Standard deviation errors of 7 microepsilon and 0.8 degrees C have been obtained for strain and temperature ranges of up to 1860 microepsilon and 120 degrees C, respectively.
Strain-independent temperature measurements using a standard and a chirped fibre bragg grating
Publisher: IEEE
Date: 07-2006
Optical fibers and sensors for biomedical applications: Bend effects
Publisher: SPIE
Date: 15-05-2011
DOI: 10.1117/12.885877
Fibre Bragg grating transverse strain sensing using reflections at twice the Bragg wavelength
Publisher: IOP Publishing
Date: 28-07-2010
Modeling of the temporal effects of heating during infrared neural stimulation
Publisher: SPIE-Intl Soc Optical Eng
Date: 07-03-2013
Non-linear temperature dependence of Bragg gratings written in different fibres, optimised for sensor applications over a wide range of temperatures
Publisher: Elsevier BV
Date: 05-2004
Fabrication of a π-phase-shifted fiber Bragg grating at twice the Bragg wavelength with the standard phase mask technique
Publisher: Optica Publishing Group
Date: 26-06-2009
DOI: 10.1364/OL.34.002021
Abstract: A pair of reflection peaks/transmission dips, at twice the Bragg wavelength, were observed in spectra of a Type I fiber Bragg grating written with the standard phase mask technique. The occurrence of two peaks/dips, rather than one, is attributed to the interleaved refractive index modulations along the fiber core, with the periodicity of the phase mask that has been observed previously in images of gratings that cause destructive interference in a reflected wave at the Bragg condition owing to the pi phase difference between the grating phases. Thus the standard phase mask technique produced an alternative type of pi-phase-shifted grating at twice the design Bragg wavelength.
Blue Upconversion Emission in Er3+-Doped Fluoride Fiber
Publisher: Elsevier BV
Date: 07-1996
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