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Browsing Staff publications (SoE) by Publication Date

Now showing items 21-40 of 603

Time-division-multiplexed interrogation of fibre Bragg grating sensors using laser diodes

Wilson, A.; James, Stephen W.; Tatam, Ralph P. (Iop Publishing Ltd, 2001-02-28)

An intensity-based technique for the interrogation of fibre Bragg grating sensors is described. The technique utilizes two longitudinal modes of a single, pulsed laser diode as a dual-wavelength source for grating illumination. ...
Marketing low cost airline services to business travellers.

Mason, Keith J. (Elsevier, 2001-03)

A number of EU low-cost airlines have reported their success in attracting business travellers on some of their routes. Recent research shows that business travellers working for small companies are more willing to trade ...
An experimental approach to quantify strain transfer efficiency of fibre bragg grating sensors to host structures

Wei, C. Y.; Ye, Chen-Chun; James, Stephen W.; Tatam, Ralph P.; Irving, Phil E. (2001-06-25)

This paper developed a method to evaluate the strain transfer efficiency of fibre Bragg grating sensors to host structures. Various coatings were applied to fibre Bragg grating sensors after being fabricated. They were ...
Analysis of the Spatial Distribution of Detector Sensitivity in a Multilayer Randomly Inhomogeneous Medium with Strong Light Scattering and Absorption by the Monte Carlo Method.

Meglinski, I. V.; Matcher, S. J. (Springer Science Business Media, 2001-10-01)

The spatial distribution of sensitivity in the domain of detection of a fiber- optic sensor used for spectrophotometric studies of skin and other biological tissues is studied. The method and results of modeling the ...
Influence of deterministic stresses on flow prediction of a low-speed axial flow compressor rear stage.

Li, Y. G.; Tourlidakis, A. (Professional Engineering Publishing, 2001-10-02)

Deterministic stresses are used to describe the unsteady effects on the flow field in multistage axial flow compressors. In this paper, a circumferentially non-uniform mixing plane method implemented with deterministic ...
Submicrometer fiber-optic Fabry-Perot interferometer formed by use of the Langmuir-Blodgett technique

Rees, N. D.; James, Stephen W.; Staines, Stephen E.; Tatam, Ralph P.; Ashwell, Geoffrey J. (Optical Society of America, 2001-12-01)

The fabrication of an optical cavity at the distal end of an optical fiber has been achieved by Langmuir-Blodgett (LB) deposition of tricosanoic acid. This technique allows nanometer-scale control over the cavity length ...
Full surface strain measurement using shearography

Groves, Roger M.; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2001-12-31)

Shearography is a full-field optical technique usually used for the determination of surface strain. Correlation of interferometric speckle patterns recorded before and after the object deformation yields fringes sensitive ...
Acousto-optic frequency switching for single-camera planar Doppler velocimetry

Ford, Helen D.; Nobes, David S.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2001-12-31)

A single-camera Planar Doppler velocimetry system has been demonstrated, in which illumination beams at two closely-spaced optical frequencies are derived from a single Argon-ion laser. The frequency of one beam lies on ...
Monitoring the lubricant condition in a low-speed rolling element bearing using high frequency stress waves

Jamaludin, N.; Mba, David; Bannister, R. H. (Professional Engineering Publishing, 2002-01-01)

This paper presents the results of an investigation into the development of a reliable, nonintrusive and effective technique capable of accessing the lubrication condition within a low-speed rotating bearing. This ...
Study of the possibility of increasing the probing depth by the method of reflection confocal microscopy upon immersion clearing of near-surface human skin layers.

Meglinski, I. V.; Bashkatov, A. N.; Genina, E. A.; Churmakov, D. Y.; Tuchin, V. V. (Turpion Ltd., 2002-01-01)

The possibility of increasing the human-skin probing depth by the method of reflection confocal microscopy (RCM) upon decreasing the amplitude of spatial fluctuations of the refractive index of the upper skin layers is ...
Complexity and cost effectiveness measures for systems design

Guenov, Marin D. (2002-04-01)

This paper proposes two measures intended to aid high level decision makers in comparing alternatives during pre-competitive studies or during the architectural design process of composite systems. The first measure is ...
Enhanced sensitivity fibre optic long period grating temperature sensor.

Khaliq, Sarfraz; James, Stephen W.; Tatam, Ralph P. (Iop Publishing Ltd, 2002-05-05)

Surrounding a long period grating, fabricated in a standard optical fibre, with a material with a high thermo-optic coefficient enhances the temperature sensitivity of a long period grating. Temperature sensitivities as ...
Tunable and switchable dual wavelength lasers using optical fibre Bragg grating external cavities.

Reilly S. P.; James, Stephen W.; Tatam, Ralph P. (Iet, 2002-08-01)

Two novel external cavity lasers are demonstrated experimentally. The first utilises a Bragg grating fabricated in highly birefringent optical fibre and offers the ability to switch between modes that are separated in ...
Regional development in airlines and travel agents relationship.

Alamdari, Fariba (Elsevier, 2002-09)

On average, 17% of airline operating cost are attributed to distribution costs which are associated with commissions to travel agents, ticketing, credit card fees, CRS fees and promotion. In recent years, airlines in North ...
Surface layer profiles of air temperature and humidity measured from unmanned aircraft

Hobbs, Stephen; Dyer, David; Courault, Dominique; Olioso, Albert; Lagouarde, Jean-Pierre; Kerr, Yann; Mcaneney, John; Bonnefond, Jean (2002-09-01)

The atmospheric surface layer couples processes in the atmosphere with those at the land surface, but is not fully understood for heterogeneous land surfaces. A small remotely piloted aircraft was flown during the ReSeDA ...
Performance-analysis-based gas turbine diagnostics: a review.

Li, Y. G. (Professional Engineering Publishing, 2002-09-01)

Gas turbine diagnostics has a history almost as long as gas turbine development itself. Early engine fault diagnosis was carried out based on manufacturer information supplied in a technical manual combined with maintenance ...
Improvement of a tail-plane strucural model using vibration test data.

Guo, Shijun J. (Elsevier Science B.V., Amsterdam, 2002-09-26)

To achieve the best structural model improvement using vibration test data, a major effort has been made to identify poor modelling regions as a guideline for subsequent model updating. The method presented and used in ...
The influence of hydrogen loading and the fabrication process on the mechanical strength of optical fibre Bragg gratings.

Wei, C. Y.; Ye, Chen-Chun; James, Stephen W.; Tatam, Ralph P.; Irving, Phil E. (Elsevier Science B.V., Amsterdam., 2002-11-01)

This paper investigates the influence of hydrogen loading and other stages of the fabrication process on the mechanical strength of fibre Bragg gratings. Following UV irradiation, tensile tests were carried out on Ge–B ...
AFM observation of surface topography of fibre Bragg gratings fabricated in germanium-boron codoped fibres and hydrogen-loaded fibres.

Wei, C. Y.; Ye, Chen-Chun; James, Stephen W.; Irving, Phil E.; Tatam, Ralph P. (Elsevier Science B.V., Amsterdam., 2002-11-01)

This paper reports the measurement of the surface topology of optical fibres containing a fibre Bragg grating (FBG) using an atomic force microscope (AFM). The AFM observation was made on FBGs fabricated via the phase ...
Quantitative assessment of skin layers absorption and skin reflectance spectra simulation in the visible and near-infrared spectral regions

Meglinski, I. V.; Matcher, S. J. (Iop Publishing, 2002-11-01)

We have simulated diffuse reflectance spectra of skin by assuming a wavelength- independent scattering coefficient for the different skin tissues and using the known wavelength dependence of the absorption coefficient ...

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