Stephen W. James
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View article: Measurement of Strain and Vibration, at Ambient Conditions, on a Dynamically Pressurised Aircraft Fuel Pump Using Optical Fibre Sensors
Measurement of Strain and Vibration, at Ambient Conditions, on a Dynamically Pressurised Aircraft Fuel Pump Using Optical Fibre Sensors Open
Ever-increasing demands to improve fuel burn efficiency of aero gas turbines lead to rises in fuel system pressures and temperatures, posing challenges for the structural integrity of the pump housing and creating internal deflections that…
View article: The Influence of Teacher Skill Variety on Pupils’ Academic Performance in Tanzanian Public Primary Schools
The Influence of Teacher Skill Variety on Pupils’ Academic Performance in Tanzanian Public Primary Schools Open
Pupils in many public primary schools in Tanzania still perform poorly academically. This study examined the influence of teacher skill variety on pupils’ academic performance. The study employed a survey research design to collect data fr…
View article: A fibre optic angle sensing tape for applications in robotics and automation
A fibre optic angle sensing tape for applications in robotics and automation Open
A dual-fibre single-plane angle-sensing tape that utilizes optical Fibre Segment Interferometry and Range- Resolved Interferometry (RRI) for angle sensing is presented. The sensing tape facilitates the multiplexing of an array of angle sen…
View article: The use of range-resolved interferometry for multi-parameter sensing in a wind tunnel
The use of range-resolved interferometry for multi-parameter sensing in a wind tunnel Open
The work presented demonstrates that key parameters in aerodynamic structural characterisation of pressure, strain, and structural dynamics, can be all measured via optical fibre sensors interrogated using the principles of range-resolved …
View article: Optical fibre pressure sensing using a frequency modulated laser-based signal processing technique
Optical fibre pressure sensing using a frequency modulated laser-based signal processing technique Open
Range resolved interferometry (RRI) applied to the interrogation of an extrinsic Fabry–Perot based pressure sensor in laboratory and wind tunnel environments is presented. A simple, compact sensor head design was fabricated and subsequentl…
View article: An experimental study of disc brake squeal
An experimental study of disc brake squeal Open
Disc brake vibrations are a cause of concern for automobile users and manufacturers. The user can find the noise of brake squeal annoying and sometimes worrying. The manufacturer suffers the immediate costs involved in vehicle warranty cla…
View article: Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 2. Measurement of shape
Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 2. Measurement of shape Open
Optical fibre strain and shape measurement sensors were deployed on a rotor blade during a full-speed helicopter ground run, with real-time data wirelessly streamed from rotor hub-mounted sensor interrogators. In part 2 of a 2-part paper s…
View article: Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 1. Measurement of strain
Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 1. Measurement of strain Open
Optical fibre strain and shape measurement sensors were deployed on a 5-m long rotor blade during a full-speed (rotation rate 6.6 Hz) helicopter ground run, with real-time data wirelessly streamed from rotor hub-mounted sensor interrogator…
View article: Electromagnetic field controlled domain wall displacement for induced strain tailoring in BaTiO3-epoxy nanocomposite
Electromagnetic field controlled domain wall displacement for induced strain tailoring in BaTiO3-epoxy nanocomposite Open
Failure in an epoxy polymer composite material is prone to initiate by the coalescence of microcracks in its polymer matrix. As such, matrix toughening via addition of a second phase as rigid or/and rubber nano/micro-particles is one of th…
View article: Electromagnetic Field Controlled Domain Wall Displacement for Induced Strain Tailoring in Batio3-Epoxy Nanocomposite: Development of A Contact-Less Active Toughening Mechanism
Electromagnetic Field Controlled Domain Wall Displacement for Induced Strain Tailoring in Batio3-Epoxy Nanocomposite: Development of A Contact-Less Active Toughening Mechanism Open
Failure in an epoxy polymer composite material is prone to initiate by the coalescence of microcracks in its polymer matrix. As such, matrix toughening via addition of a second phase as rigid or/and rubber nano/micro-particles is one of th…
View article: Label-Free Creatinine Optical Sensing Using Molecularly Imprinted Titanium Dioxide-Polycarboxylic Acid Hybrid Thin Films: A Preliminary Study for Urine Sample Analysis
Label-Free Creatinine Optical Sensing Using Molecularly Imprinted Titanium Dioxide-Polycarboxylic Acid Hybrid Thin Films: A Preliminary Study for Urine Sample Analysis Open
Creatinine (CR) is a representative metabolic byproduct of muscles, and its sensitive and selective detection has become critical in the diagnosis of kidney diseases. In this study, poly(acrylic acid) (PAA)-assisted molecularly imprinted (…
View article: Application of fibre optic sensing systems to measure rotor blade structural dynamics
Application of fibre optic sensing systems to measure rotor blade structural dynamics Open
This paper compares two fibre optic sensing techniques for vibration characterisation: (a) optical fibre Bragg grating (FBG) strain gauges and (b) a novel direct fibre optic shape sensing (DFOSS) approach based on differential interferomet…
View article: High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm
High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm Open
A pressure sensor specified for aerodynamic applications and based on optical fibre strain sensors mounted on a circular glass fibre reinforced polymer membrane is presented. The use of two fibre optic strain sensing technologies is explor…
View article: Production process monitoring and post-production strain measurement on a full-size carbon-fibre composite aircraft tail cone assembly using embedded optical fibre sensors
Production process monitoring and post-production strain measurement on a full-size carbon-fibre composite aircraft tail cone assembly using embedded optical fibre sensors Open
Multiplexed optical fibre sensors were embedded into a carbon-fibre-reinforced-preform during the industrial production of a full-sized, one-piece tail cone assembly for a regional jet aircraft. Optical fibre Fresnel sensors monitored both…
View article: 1.5 Dynamic Measurement of Strain and Shape on a Rotating Helicopter Rotor Blade Using Optical Fibre Sensors
1.5 Dynamic Measurement of Strain and Shape on a Rotating Helicopter Rotor Blade Using Optical Fibre Sensors Open
Fibre Bragg grating (FBG) and interferometric direct fibre-optic shape sensing (DFOSS) instrumentation were deployed on helicopter rotor blades during a full-speed ground run to provide insights into the blade dynamics.Data were streamed w…
View article: Tapered Optical Fibre Sensors: Current Trends and Future Perspectives
Tapered Optical Fibre Sensors: Current Trends and Future Perspectives Open
The development of reliable, affordable and efficient sensors is a key step in providing tools for efficient monitoring of critical environmental parameters. This review focuses on the use of tapered optical fibres as an environmental sens…
View article: Transmission line method for the simulation of fiber Bragg gratings
Transmission line method for the simulation of fiber Bragg gratings Open
A new method for the analysis and design of fiber Bragg gratings (FBGs) based on the theory of transmission lines has been developed and verified both theoretically and experimentally. The method is an extension of the coupled-mode theory …
View article: Bladesense – a novel approach for measuring dynamic helicopter rotor blade deformation
Bladesense – a novel approach for measuring dynamic helicopter rotor blade deformation Open
Technologies that allow accurate measurement of rotorblade dynamics can impact almost all areas of the rotorcraft sector; ranging from maintenance all the way to blade design. The BladeSense project initiated in 2016 aims to take a step in…
View article: A Fibre Optic Long Period Grating Immunosensor for Campylobacter jejuni with Enhanced Sensitivity by Bacterial Staining
A Fibre Optic Long Period Grating Immunosensor for Campylobacter jejuni with Enhanced Sensitivity by Bacterial Staining Open
Poster presented at the Cranfield Doctoral Network Annual Event 2018.Campylobacteriosis is one of the most widely reported bacterial cause of gastroenteritis in humans in the world. One of the bacterial species that most causes the disease…
View article: Biomedical application of optical fibre sensors
Biomedical application of optical fibre sensors Open
Optical fibre sensors(OFS), as a result of their unique properties such as small size, no interference with electromagnetic radiation, high sensitivity and the ability to design multiplexed or distributed sensing systems, have found applic…
View article: A Fibre Optic Long Period Grating Immunosensor for Campylobacter jejuni with Enhanced Sensitivity by Bacterial Staining
A Fibre Optic Long Period Grating Immunosensor for Campylobacter jejuni with Enhanced Sensitivity by Bacterial Staining Open
Poster presented at the Cranfield Doctoral Network Annual Event 2018. Campylobacteriosis is one of the most widely reported bacterial cause of gastroenteritis in humans in the world. One of the bacterial species that most causes the diseas…
View article: Optimized Process for Fabricating Ultrashort Tapered Long-Period Gratings
Optimized Process for Fabricating Ultrashort Tapered Long-Period Gratings Open
The CO2 laser based fabrication of tapered long period gratings (TLPGs) is optimized so that their transmission spectra are comparable with those made using the arc-discharge technique, which typically exhibits transmission losses below 2 …
View article: Simultaneous optical interrogation of multiple tuning fork resonators using range-resolved interferometry
Simultaneous optical interrogation of multiple tuning fork resonators using range-resolved interferometry Open
In a proof-of-principle experiment, the vibrations of a set of three tuning folk resonators are simultaneously interrogated along a single optical beam using range-resolved interferometry. Measurements with noise standard deviations in the…
View article: Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction
Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction Open
The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor of 3, to 2611 nm/…
View article: Dynamic Fiber-Optic Shape Sensing Using Fiber Segment Interferometry
Dynamic Fiber-Optic Shape Sensing Using Fiber Segment Interferometry Open
Dynamic fiber-optic shape sensing, often also referred to as curvature or bend sensing, is demonstrated using fiber segment interferometry, where chains of fiber segments, separated by broadband Bragg grating reflectors, are interrogated u…