Dr. Graham J. Thursby Profile

Dr. Graham J. Thursby

Research Fellow at Univ of Strathclyde

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Author

Publications (42)

Proceedings Article | 18 May 2011 Paper

The use of fibre optic sensors to compare the internal strains and pressures produced by different Lamb wave modes

Graham Thursby, Brian Culshaw

Proceedings Volume 7753, 77536S (2011) https://doi.org/10.1117/12.886115

KEYWORDS: Ultrasonography, Fiber Bragg gratings, Polarimetry, Sensors, Fiber optics sensors, Particles, Polarizers, Wave plates, Motion analysis, Carbon

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Proceedings Article | 15 April 2011 Paper

Evaluation of the internal strains and stresses produced in a plate by propagating Lamb waves through the use of fibre optic sensors

Graham Thursby, Brian Culshaw

Proceedings Volume 7982, 79820B (2011) https://doi.org/10.1117/12.881594

KEYWORDS: Fiber Bragg gratings, Sensors, Ultrasonography, Polarimetry, Particles, Wave plates, Wave propagation, Fiber optics sensors, Carbon, Ferroelectric materials

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Proceedings Article | 9 September 2010 Paper

Ultrasonic modal detection in carbon fibre plates using fibre optic sensors

Graham Thursby, Brian Culshaw

Proceedings Volume 7653, 765338 (2010) https://doi.org/10.1117/12.866437

KEYWORDS: Sensors, Polarimetry, Carbon, Fiber Bragg gratings, Polarizers, Ultrasonography, Fiber optics sensors, Particles, Ultrasonics, Optical fibers

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Proceedings Article | 14 May 2010 Paper

Recovery of acetylene absorption line profile basing on tunable diode laser spectroscopy with intensity modulation and photoacoustic spectroscopy

Li Li, Graham Thursby, George Stewart, Norhana Arsad, Deepak Uttamchandani, Brian Culshaw, Yiding Wang

Proceedings Volume 7726, 77261O (2010) https://doi.org/10.1117/12.854075

KEYWORDS: Absorption, Modulation, Photoacoustic spectroscopy, Mirrors, Microelectromechanical systems, Actuators, Spectroscopy, Signal detection, Laser spectroscopy, Tunable diode lasers

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A novel and direct absorption line recovery technique based on tunable diode laser spectroscopy with intensity modulation is presented. Photoacoustic spectroscopy is applied for high sensitivity, zero background and efficient acoustic enhancement at a low modulation frequency. A micro-electromechanical systems (MEMS) mirror driven by an electrothermal actuator is used for generating laser intensity modulation (without wavelength modulation) through the external reflection. The MEMS mirror with 10μm thick structure material layer and 100nm thick gold coating is formed as a circular mirror of 2mm diameter attached to an electrothermal actuator and is fabricated on a chip that is wire-bonded and placed on a PCB holder. Low modulation frequency is adopted (since the resonant frequencies of the photoacoustic gas cell and the electrothermal actuator are different) and intrinsic high signal amplitude characteristics in low frequency region achieved from measured frequency responses for the MEMS mirror and the gas cell. Based on the property of photoacoustic spectroscopy and Beer's law that detectable sensitivity is a function of input laser intensity in the case of constant gas concentration and laser path length, a Keopsys erbium doped fibre amplifier (EDFA) with opto-communication C band and high output power up to 1W is chosen to increase the laser power. High modulation depth is achieved through adjusting the MEMS mirror's reflection position and driving voltage. In order to scan through the target gas absorption line, the temperature swept method is adopted for the tunable distributed feed-back (DFB) diode laser working at 1535nm that accesses the near-infrared vibration-rotation spectrum of acetylene. The profile of acetylene P17 absorption line at 1535.39nm is recovered ideally for ~100 parts-per-million (ppm) acetylene balanced by nitrogen. The experimental signal to noise ratio (SNR) of absorption line recovery for 500mW laser power was ~80 and hence the detectable sensitivity is of the order of 1ppm.

Proceedings Article | 20 April 2010 Paper

Near infrared spectroscopy for fibre based gas detection

George Stewart, Walter Johnstone, Graham Thursby, Brian Culshaw

Proceedings Volume 7675, 767507 (2010) https://doi.org/10.1117/12.852919

KEYWORDS: Modulation, Absorption, Methane, Sensing systems, Gases, Calibration, Tunable diode lasers, Phase shift keying, Sensors, Fiber optics

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Proceedings Article | 14 April 2010 Paper

A comparison of three optical systems for the detection of broadband ultrasound

G. Thursby, C. McKee, B. Culshaw

Proceedings Volume 7648, 76480T (2010) https://doi.org/10.1117/12.847296

KEYWORDS: Polarimetry, Sensors, Fiber Bragg gratings, Ultrasonography, Polarization, Acoustics, Polarizers, Lead, Signal detection, Fiber optics sensors

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Proceedings Article | 5 October 2009 Paper

Direct monitoring of underwater ultrasonic transducers in the near field using fibre Bragg grating sensors

G. M. Flockhart, M. McGuire, S. Pierce, G. Thursby, G. Stewart, G. Hayward, B. Culshaw

Proceedings Volume 7503, 750331 (2009) https://doi.org/10.1117/12.835468

KEYWORDS: Fiber Bragg gratings, Transducers, Sensors, Ultrasonics, Acoustics, Optical fibers, Near field, Ferroelectric polymers, Optical amplifiers, Wave propagation

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Proceedings Article | 7 April 2009 Paper

CW laser generated ultrasound techniques for microstructure material properties evaluation

Graham Thursby, Brian Culshaw, Gareth Pierce, Alison Cleary, Campbell McKee, Istvan Veres

Proceedings Volume 7293, 72930Y (2009) https://doi.org/10.1117/12.816362

KEYWORDS: Ultrasonography, Signal detection, Modulation, Acoustics, Continuous wave operation, Signal processing, Aluminum, Optical amplifiers, Dispersion, Ultrasonics

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Proceedings Article | 16 May 2008 Paper

Using fiber Bragg gratings to measure Lamb waves in an anisotropic composite plate

Y. Botsev, E. Arad, M. Tur, I. Kressel, S. Gali, G. Thursby, B. Culshaw

Proceedings Volume 7004, 700445 (2008) https://doi.org/10.1117/12.786055

KEYWORDS: Fiber Bragg gratings, Wave plates, Wave propagation, Composites, Finite element methods, Sensors, Actuators, Ferroelectric materials, Ultrasonics, Ultrasonography

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Proceedings Article | 7 April 2008 Paper

The use of fibre Bragg gratings to detect ultrasound in anisotropic materials

Graham Thursby, Brian Culshaw, Yakov Botsev, Eyal Arad, Roman Zeyde, Moshe Tur, Iddo Kressel

Proceedings Volume 6933, 69330C (2008) https://doi.org/10.1117/12.775442

KEYWORDS: Fiber Bragg gratings, Wave propagation, Ferroelectric materials, Wave plates, Sensors, Ultrasonography, Composites, Wavefronts, Signal detection, Carbon

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Proceedings Article | 2 July 2007 Paper

The detection of ultrasound using fibre optic sensors

Brian Culshaw, Graham Thursby, Daniel Betz, Boja Sorazu

Proceedings Volume 6619, 66192J (2007) https://doi.org/10.1117/12.738624

KEYWORDS: Sensors, Fiber Bragg gratings, Ultrasonography, Fiber optics sensors, Wave propagation, Wavefronts, Ultrasonics, Acoustics, Optical fibers, Polarimetry

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Proceedings Article | 11 April 2007 Paper

Detection of structural damage in carbon fibre and metal structures using Lamb waves

Alistair MacLean, Graham Thursby, Hamish Hogg, Daniel Betz, Brian Culshaw

Proceedings Volume 6532, 65321S (2007) https://doi.org/10.1117/12.718741

KEYWORDS: Fiber Bragg gratings, Ferroelectric materials, Carbon, Ultrasonography, Transducers, Acoustics, Signal attenuation, Wave propagation, Composites, Wave plates

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Proceedings Article | 10 October 2006 Paper

Versatile fiber-Bragg grating arrays for strain mapping and ultrasound Lamb wave detection

G. Thursby, D. Betz, B. Culshaw, W. Staszewski

Proceedings Volume 6379, 63790F (2006) https://doi.org/10.1117/12.686823

KEYWORDS: Fiber Bragg gratings, Ultrasonography, Sensors, Ferroelectric materials, Structured optical fibers, Temperature sensors, Quartz, Aluminum, Transducers, Signal detection

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Proceedings Article | 28 March 2006 Paper

Ultrasound detection of damage in complex carbon fiber/metal structures

G. Thursby, A. MacLean, H. Hogg, B. Culshaw

Proceedings Volume 6177, 61770P (2006) https://doi.org/10.1117/12.659043

KEYWORDS: Ferroelectric materials, Carbon, Structured optical fibers, Signal detection, Epoxies, Wave propagation, Wave plates, Signal processing, Composites, Signal attenuation

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We describe work carried out to monitor the structural health of a complex structure comprising both carbon fibre and metal components using ultrasound techniques. The work is designed to be used in a high performance car, but could find applications in other areas such as the aerospace industry. There are two different types of potential problem that need to be examined; the first is damage (e.g. holes, delaminations) to carbon fibre structure, and the second is damage to joints either between two carbon fibre components or between a carbon fibre component and a metallic one. The techniques used are based around the use of PZT transducers for both the generation and detection of ultrasonic Lamb waves. To date we have been carrying out experiments on mock-up samples, but are due to conduct tests on an actual vehicle. Lamb waves propagate in modes whose order is determined by the frequency thickness product. Their properties, such as phase and amplitude can be modified by the presence of damage, such as holes and delaminations. If we record the response of a healthy structure, we can then compare it with signals obtained on subsequent occasions to determine if any significant change has taken place. It is essential, however, to be able to differentiate between the effects of damage and those of environmental changes such as temperature. For this reason we have monitored the response of a sample at different temperatures both before and after drilling a hole in it to simulate damage. Depending on the positions of the transducers with respect to the damaged area, it is possible to detect either attenuation of the entire signal or changes in a specific portion of the signal produced by reflections. Results from these experiments will be presented at the conference. Signal processing techniques for separating damage from the effects of temperature will also be discussed. We also look at the deterioration of joints, which can either be epoxy bonded (carbon fibre to carbon fibre) or bolted together (carbon fibre to aluminium). In the case of the bonded structures we are looking at the effects of failure of the bond layer, whilst in the case of the bolted samples we are looking at loosening of the bolts. The debonding was simulated by joining together a flat plate of carbon fibre composite with an L-shaped carbon fibre piece using a couplant such as grease. Similar experiments were carried out using an aluminium anglebar bolted to the plate, with the bolts both tightened and loose. Signals of both the transmitted wave in the plate and the power coupled to the L piece were measured before and after debonding. This gives a more reliable measure of the change in power transfer between the two components as the joint/bond degrades. It was found that in order to get maximum coupling to the second component the frequency of the acoustic wave had to be altered. This is because in the bonding region the combined thickness of the components alters the modal propagation characteristics of the structure compared with those of the single component region.

Proceedings Article | 16 May 2005 Paper

An improved fiber optic strain sensor for gas tank monitoring with rf subcarrier phase and I&Q demodulation techniques

Graham Thursby, Fengzhong Dong, Brian Culshaw, Guido Massaro, Branko Glisic, Daniele Inaudi

Proceedings Volume 5758, (2005) https://doi.org/10.1117/12.605523

KEYWORDS: Sensors, Carbon, Fiber optics sensors, Fiber optics, Optical fibers, Signal detection, Demodulation, Inspection, Modulation, Safety

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Proceedings Article | 9 May 2005 Paper

Novel methods of Lamb wave detection for material damage detection and location

Graham Thursby, Borja Sorazu, Daniel Betz, Brian Culshaw

Proceedings Volume 5768, (2005) https://doi.org/10.1117/12.600545

KEYWORDS: Sensors, Fiber Bragg gratings, Ultrasonography, Polarimetry, Ferroelectric materials, Transducers, Polarization, Damage detection, Interferometers, Acoustics

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Proceedings Article | 27 July 2004 Paper

Comparison of point and integrated fiber optic sensing techniques for ultrasound detection and location of damage

Graham Thursby, Borja Sorazu, Daniel Betz, Wieslaw Staszewski, Brian Culshaw

Proceedings Volume 5384, (2004) https://doi.org/10.1117/12.549023

KEYWORDS: Sensors, Acoustics, Fiber Bragg gratings, Signal detection, Polarimetry, Ultrasonography, Ferroelectric materials, Transducers, Wave propagation, Fiber optics sensors

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Proceedings Article | 27 July 2004 Paper

Noncontact material evaluation for characterization and wear detection using laser-generated ultrasound and interferometric detection

Graham Thursby, Brian Culshaw, Borja Sorazu, Syed Atique, Fengzhong Dong

Proceedings Volume 5384, (2004) https://doi.org/10.1117/12.549024

KEYWORDS: Ultrasonography, Dispersion, Ultrasonics, Interferometry, Acoustics, Wave propagation, Aluminum, Sensors, Phase velocity, Wave plates

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Proceedings Article | 9 June 2004 Paper

The use of fibre Bragg grating sensors for damage detection and location in structural materials

Graham Thursby, Daniel Betz, Wieslaw Staszewski, Brian Culshaw

Proceedings Volume 5502, (2004) https://doi.org/10.1117/12.566631

KEYWORDS: Fiber Bragg gratings, Sensors, Ultrasonography, Acoustics, Ferroelectric materials, Signal detection, Wave propagation, Damage detection, Transducers, Ultrasonics

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Proceedings Article | 9 June 2004 Paper

High-frequency acoustic detector based on fiber Fabry-Perot interferometer

Hee Park, Graham Thursby, Brian Culshaw

Proceedings Volume 5502, (2004) https://doi.org/10.1117/12.566634

KEYWORDS: Acoustics, Sensors, Signal to noise ratio, Fabry–Perot interferometry, Phase modulation, Phase shift keying, Mirrors, Modulation, Reflectivity, Scattering

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Proceedings Article | 22 July 2003 Paper

Ultrasonic wavefront integration using optical fiber sensors

Borja Sorazu, Graham Thursby, Brian Culshaw, Fengzhong Dong, Yang Yong, Jun Yao

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484265

KEYWORDS: Sensors, Ultrasonics, Ultrasonography, Wavefronts, Optical fibers, Modulation, Nondestructive evaluation, Acoustics, Wave plates, Polarimetry

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Proceedings Article | 22 July 2003 Paper

Damage detection in structural materials using a polarimetric fiber optic sensor

Graham Thursby, Borja Sorazu, Fengzhong Dong, Daniel Betz, Brian Culshaw

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484758

KEYWORDS: Sensors, Acoustics, Polarization, Polarimetry, Wave plates, Fiber optics sensors, Damage detection, Signal detection, Polarizers, Wave propagation

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Proceedings Article | 22 July 2003 Paper

RF subcarrier-based fiber strain sensor for monitoring composite gas storage tanks

Fengzhong Dong, Graham Thursby, Brian Culshaw

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484266

KEYWORDS: Sensors, Fiber optics sensors, Composites, Temperature metrology, Modulation, Phase shift keying, Signal generators, Sensing systems, Fiber optics, Signal detection

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Proceedings Article | 22 July 2003 Paper

Lamb wave detection and source location using fiber Bragg grating rosettes

Daniel Betz, Graham Thursby, Brian Culshaw, Wieslaw Staszewski

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484268

KEYWORDS: Fiber Bragg gratings, Ultrasonics, Sensors, Ferroelectric materials, Acoustics, Fiber optics, Wave propagation, Signal detection, Transducers, Structural health monitoring

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Proceedings Article | 13 March 2003 Paper

DAMASCOS damage location demonstrator for structural health monitoring

Graeme Manson, B. Lee, Graham Thursby, Keith Worden, Fengzhong Dong, Brian Culshaw

Proceedings Volume 4763, (2003) https://doi.org/10.1117/12.508686

KEYWORDS: Sensors, Data acquisition, Composites, Neural networks, Actuators, Transducers, Damage detection, Feature selection, Structural health monitoring, Feature extraction

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Proceedings Article | 25 September 2001 Paper

New approach to the design of fiber optic devices based on Berry's topological phase

P. Senthilkumaran, Graham Thursby, Brian Culshaw

Proceedings Volume 4417, (2001) https://doi.org/10.1117/12.441331

KEYWORDS: Polarization, Fiber optics, Optical spheres, Optical design, Mirrors, Sagnac interferometers, Chlorine, Interferometers, Solids, Wave plates

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Proceedings Article | 9 November 2000 Paper

Possible applications for Berry's topological phase in fibre sensor systems

G. Thursby

Proceedings Volume 4185, 41854N (2000) https://doi.org/10.1117/12.2302310

KEYWORDS: Polarization, Mirrors, Sensors, Fiber optics sensors, Wave plates, Optical spheres, Birefringence, Directional couplers, Fiber optics, Optical fibers

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Proceedings Article | 12 June 2000 Paper

Distributed fiber optic sensors for humidity and hydrocarbon detection

Alistair MacLean, Chris Moran, Graham Thursby, S. Gareth Pierce, Brian Culshaw, Neil Graham

Proceedings Volume 3986, (2000) https://doi.org/10.1117/12.388123

KEYWORDS: Sensors, Signal attenuation, Humidity, Environmental sensing, Polymers, Optical fibers, Coating, Liquids, Fiber optics sensors, Manufacturing

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Proceedings Article | 21 July 1998 Paper

Hydrogel/fiber optic sensor for distributed measurement of humidity and pH value

Alistair MacLean, W. Craig Michie, S. Gareth Pierce, Graham Thursby, Brian Culshaw, Chris Moran, Neil Graham

Proceedings Volume 3330, (1998) https://doi.org/10.1117/12.316967

KEYWORDS: Sensors, Signal attenuation, Humidity, Polymers, Optical fibers, Polymeric sensors, Soil science, Temperature metrology, Environmental sensing, Coating

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SPIE Journal Paper | 1 August 1997

Geometric representation of errors in measurements of strain and temperature

Wei Jin, W. Craig Michie, Graham Thursby, Maria Konstantaki, Brian Culshaw

OE, Vol. 36, Issue 08, (August 1997) https://doi.org/10.1117/12.10.1117/1.601453

KEYWORDS: Error analysis, Temperature metrology, Sensors, Polarimetry, Phase measurement, Interferometers, Fiber Bragg gratings, Mirrors, Optical engineering, Fiber optics sensors

SPIE Journal Paper | 1 February 1997

Simultaneous measurement of strain and temperature: error analysis

Wei Jin, W. Craig Michie, Graham Thursby, Maria Konstantaki, Brian Culshaw

OE, Vol. 36, Issue 02, (February 1997) https://doi.org/10.1117/12.10.1117/1.601233

KEYWORDS: Sensors, Temperature metrology, Error analysis, Polarimetry, Fiber Bragg gratings, Phase measurement, Calibration, Optical engineering, Polarization maintaining fibers, Connectors

Proceedings Article | 30 May 1996 Paper

Optical fiber sensors for monitoring of structures (OSMOS)

W. Craig Michie, Brian Culshaw, Graham Thursby, Maria Konstantaki, Marc Turpin, Catherine Lecot, Bertrand Noharet, Michel Lequime, Pietro VaNotti, Antonello Vanucci, Didier Lang, P. Kalb, Roger Davidson, Scott Roberts, Pantelis Papadopoulos, Aris Ikiades, Jean Chazelas, Philippe Bonniau, Tom Herbst, A. Windisch

Proceedings Volume 2718, (1996) https://doi.org/10.1117/12.240878

KEYWORDS: Sensors, Polarimetry, Temperature metrology, Composites, Optical fibers, Manufacturing, Civil engineering, Aerospace engineering, Fiber optics sensors, Receivers

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Proceedings Article | 30 May 1996 Paper

Optical sensors for temperature and strain measurement

W. Craig Michie, Brian Culshaw, Graham Thursby, Wei Jin, Maria Konstantaki

Proceedings Volume 2718, (1996) https://doi.org/10.1117/12.240855

KEYWORDS: Temperature metrology, Sensors, Polarimetry, Fiber Bragg gratings, Optical fibers, Error analysis, Phase measurement, Multiplexing, Optical testing, Fiber optics sensors

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Proceedings Article | 25 September 1995 Paper

Combined strain and temperature measurements using optical fibers

W. Craig Michie, Brian Culshaw, Maria Konstantaki, Graham Thursby

Proceedings Volume 2510, (1995) https://doi.org/10.1117/12.221709

KEYWORDS: Temperature metrology, Sensors, Polarization, Polarimetry, Optical testing, Optical fibers, Fiber Bragg gratings, Multiplexing, Interferometers, Polarization maintaining fibers

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Proceedings Article | 14 September 1994 Paper

In-line mode splitter applied to a dual polarimeter in elliptical core fibre

Graham Thursby, Douglas Walsh, W. Craig Michie, Brian Culshaw

Proceedings Volume 2360, (1994) https://doi.org/10.1117/12.185069

KEYWORDS: Polarimetry, Polarization, Prisms, Sensors, Polishing, Temperature metrology, Fiber optics sensors, Optical fibers, Surface finishing, Wave plates

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Proceedings Article | 30 April 1993 Paper

Refractive-index sensors based on coupling to high-index multimode overlays

David Moodie, Walter Johnstone, Graham Thursby, Kevin McCallion

Proceedings Volume 1796, (1993) https://doi.org/10.1117/12.143569

KEYWORDS: Sensors, Waveguides, Refractive index, Overlay metrology, Polishing, Lithium niobate, Structured optical fibers, Polarization, Optoelectronics, Phase matching

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Proceedings Article | 26 March 1993 Paper

Optical techniques for determination of the state of cure of epoxy-resin-based systems

W. Craig Michie, Graham Thursby, Walter Johnstone, Brian Culshaw

Proceedings Volume 1798, (1993) https://doi.org/10.1117/12.141316

KEYWORDS: Refractive index, Waveguides, Plasmons, Epoxies, Polishing, Composites, Optical fibers, Surface plasmons, Manufacturing, Signal attenuation

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Proceedings Article | 19 February 1993 Paper

Tunable high-resolution fiber optic WDMs using the high-index approach

Walter Johnstone, David Moodie, Graham Thursby, Kevin McCallion, Gordon Fawcett

Proceedings Volume 1792, (1993) https://doi.org/10.1117/12.141187

KEYWORDS: Waveguides, Overlay metrology, Refractive index, Fiber optics, Wavelength division multiplexing, Polishing, Dispersion, Fiber couplers, Lithium niobate, Liquid crystals

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Proceedings Article | 1 February 1992 Paper

Optical fiber switch using electro-optic waveguide interlays

Kevin McCallion, Walter Johnstone, Graham Thursby

Proceedings Volume 1580, (1992) https://doi.org/10.1117/12.135381

KEYWORDS: Electro optics, Switches, Waveguides, Lithium niobate, Switching, Zinc, Polarization, Optical fibers, Polishing, Electrodes

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Proceedings Article | 1 February 1992 Paper

In-line optical fiber modulators without interruption of the fiber

Walter Johnstone, David Moodie, Graham Thursby, S. Murray, M. Gill, Alaster McDonach, Brian Culshaw

Proceedings Volume 1580, (1992) https://doi.org/10.1117/12.135380

KEYWORDS: Modulation, Overlay metrology, Modulators, Lithium niobate, Optical fibers, Polishing, Electro optics, Electrodes, Switching, Waveguides

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Proceedings Article | 1 February 1992 Paper

Wavelength selective optical fiber components using solid state waveguide overlays

Walter Johnstone, Graham Thursby, R. Varshney, David Moodie, Kevin McCallion, Brian Culshaw

Proceedings Volume 1580, (1992) https://doi.org/10.1117/12.135375

KEYWORDS: Waveguides, Overlay metrology, Polishing, Receivers, Optical fibers, Lithium niobate, Fiber optic components, Polarization, Glasses, Cladding

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Proceedings Article | 1 August 1991 Paper

Multimode approach to optical fiber components and sensors

Walter Johnstone, Graham Thursby, Brian Culshaw, S. Murray, M. Gill, Alaster McDonach, David Moodie, G. Fawcett, George Stewart, Kevin McCallion

Proceedings Volume 1506, (1991) https://doi.org/10.1117/12.45969

KEYWORDS: Sensors, Lithium niobate, Polishing, Modulators, Overlay metrology, Structured optical fibers, Electrodes, Optical fibers, Micro optics, Refractive index

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Showing 5 of 42 publications

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