Stephen E. Staines
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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: Mid-IR standoff measurement of ageing-related spectroscopic changes in bitumen in the 6 µm (1700 cm−1) region. Part 2: Instrument development and results
Mid-IR standoff measurement of ageing-related spectroscopic changes in bitumen in the 6 µm (1700 cm−1) region. Part 2: Instrument development and results Open
The development and experimental performance of instrumentation to measure ageing-related spectroscopic changes in bitumen is described. Oxidation of bitumen at the surface increases the number of carbonyl (C=O) bonds, and this can be meas…
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: 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: 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: 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: Wavelength-locking of a semiconductor laser using an electronic technique
Wavelength-locking of a semiconductor laser using an electronic technique Open
This work describes a novel system to control the stability of a 1583 nm telecommunications laser diode via measurement of junction voltage. This electronic technique dispenses with the optical components used in conventional
\n
\nwaveleng…
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: 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: 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…
View article: All-electronic frequency stabilization of a DFB laser diode
All-electronic frequency stabilization of a DFB laser diode Open
A laser diode's junction voltage is a sensitive measure of its temperature and can be used in a thermal control feedback loop. To compensate for the temperature dependence of the laser's internal resistance, we have measured the dynamic re…
View article: Monitoring the fabrication of tapered optical fibres
Monitoring the fabrication of tapered optical fibres Open
A variety of optical methods to enhance the process of making optical fibre tapers are explored. A thermal camera was used to both refine the alignment of the optical components and optimize the laser power profile during the tapering proc…
View article: Development of the Cranfield University Bulldog flight test facility
Development of the Cranfield University Bulldog flight test facility Open
Cranfield University's National Flying Laboratory Centre (NFLC) has developed a Bulldog light aircraft into a flight test facility. The facility is being used to research advanced in-flight instrumentation including fibre optic pressure an…
View article: Development and application of optical fibre strain and pressure sensors for in-flight measurements
Development and application of optical fibre strain and pressure sensors for in-flight measurements Open
Fibre optic based sensors are becoming increasingly viable as replacements for traditional
\nflight test sensors. Here we present laboratory, wind tunnel and flight test results of fibre
\nBragg gratings (FBG) used to measure surface strai…
View article: Railway track component condition monitoring using optical fibre Bragg grating sensors
Railway track component condition monitoring using optical fibre Bragg grating sensors Open
The use of optical fibre Bragg grating (FBG) strain sensors to monitor the condition of safety critical rail components is investigated. Fishplates, switchblades and stretcher bars on the Stagecoach Supertram tramway in Sheffield in the UK…
View article: 2.1 - Adaption of Fibre Optic Sensors and Data Processing Systems for Flight Test on a Bulldog Light Aircraft
2.1 - Adaption of Fibre Optic Sensors and Data Processing Systems for Flight Test on a Bulldog Light Aircraft Open
Fibre optic sensors for pressure and strain measurement offer significant advances in a flight test environment as they have no local electromagnetic compatibility (EMC) restrictions, offer high spatial and temporal resolution and have a m…