CERES Home
→
Browsing by Author

Browsing by Author "Chehura, Edmon"

Now showing items 9-26 of 26

In-line fibre-optic laser doppler velocimeter using bragg grating interferometric filters as frequency to intensity transducers

Chehura, Edmon (2002-06)

Three dimensional complex flows particularly those of turbomachinery present challenges to current measurement technology in terms of restricted optical access, measurement accuracy for the on-axis velocity component, ...
Interferometric fibre-optic curvature sensing for structural, directional vibration measurements

Kissinger, Thomas; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (SPIE, 2017-06-26)

Dynamic fibre-optic curvature sensing using fibre segment interferometry is demonstrated using a cost-effective rangeresolved interferometry interrogation system. Differential strain measurements from four fibre strings, ...
Laser-frequency locking techniques for high-sensitivity strain measurements by high-birefringence fiber Bragg gratings and resonators

Salza, M.; Gagliardi, G.; Di Maio, A.; Ferraro, P.; De Natale, P.; Chehura, Edmon; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2007-12-31)

A new approach to simultaneously interrogate orthogonal axes of single Fiber- Bragg-Gratings (FBGs) and FBG-FabryPerot resonator sensors fabricated in linearly highly birefringent (HiBi) fibre is presented. Novel ...
Locally pressed fibre Bragg grating pressure sensor

Correia, Ricardo N.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (2006-12-31)

A spectral-hole created by locally pressing a fibre Bragg grating exhibited a wavelength-shift within the FBG bandwidth. A sensitivity of 74.3pm/(N/mm) was obtained for pressure applied along the slow axis of a high ...
Multi-component strain development in superconducting magnet coils monitored using fibre Bragg grating sensors fabricated in highly linearly birefringent fibre

Chehura, Edmon; Buggy, Stephen J.; James, Stephen W.; Johnstone, Adam; Lakrimi, M’hamed; Domptail, Fred; Twin, Andrew; Tatam, Ralph P. (Institute of Physics, 2011-12-31)

The commissioning of superconducting magnet coils was monitored using embedded optical fibre Bragg grating sensors (FBG) fabricated in highly linearly birefringent (HiBi) fibre. The HiBi FBG sensors monitored the internal ...
Multiplexing a serial array of tapered optical fibre sensors using coherent optical frequency domain reflectometry

Jarzebinska, Renata; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (Iop Publishing Ltd, 2012-08-01)

The use of high spatial resolution optical frequency domain reflectometry (OFDR) to facilitate the multiplexing of a serial array of tapered optical fibre sensors is presented. Changes in the attenuation of the Rayleigh ...
Multiplexing curvature sensors using fibre segment interferometry for lateral vibration measurements

Kissinger, Thomas; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (SPIE - International Society for Optics and Photonics, 2017-04-23)

Dynamic fibre-optic curvature sensing is demonstrated by interrogating chains of fibre segments, separated by broadband Bragg grating reflectors, using range-resolved interferometry (RRI). Four fibre strings, containing ...
On-line monitoring of multi-component strain development in a tufting needle using optical fibre Bragg grating sensors

Chehura, Edmon; Dell'Anno, Giuseppe; Huet, Tristan; Staines, Stephen E.; James, Stephen W.; Partridge, Ivana K.; Tatam, Ralph P. (Institute of Physics, 2014-05-20)

Dynamic loadings induced on a tufting needle during the tufting of dry carbon fibre preform via a commercial robot-controlled tufting head were investigated in situ and in real-time using optical fibre Bragg grating (FBG) ...
Optical fiber sensing based on reflection laser spectroscopy

Gagliardi, G.; Salza, M.; Ferraro, P.; Chehura, Edmon; Tatam, Ralph P.; Gangopadhyay, T. K.; Ballard, N.; Paz-Soldan, D.; Barnes, J. A.; Loock, H-P; Lam, TT-Y; Chow, J. H.; De Natale, P. (MDPI AG, 2010-03-05)

An overview on high-resolution and fast interrogation of optical-fiber sensors relying on laser reflection spectroscopy is given. Fiber Bragg-gratings (FBGs) and FBG resonators built in fibers of different types are used ...
Optical Fibre Grating Refractometers for Resin Cure Monitoring.

Buggy, Stephen J.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (Institute of Physics, 2007-06-01)

The use of fibre grating refractometers as a means of monitoring the cure of a UVcured epoxy resin is presented. The wavelength shift of the attenuation bands of a long period grating and the spectral response of a tilted ...
Production process monitoring and post-production strain measurement on a full-size carbon-fibre composite aircraft tail cone assembly using embedded optical fibre sensors

Chehura, Edmon; James, Stephen W.; Staines, Stephen; Groenendijk, Chris; Cartié, Denis; Portet, Stephanie; Hugon, Michael; Tatam, Ralph P. (IOP, 2020-07-13)

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 ...
Resin directional flow and degree of cure sensing using chirped optical fibre long period gratings

Wong, Rebecca Y. N.; Chehura, Edmon; James, Stephen; Tatam, Ralph P. (IEEE, 2017-08-21)

The use of chirped long period gratings (CLPGs) for monitoring the flow, the direction of the flow and the subsequent cure of an epoxy resin is presented. The asymmetric properties of the CLPG and its sensitivity to ...
Rouard's method as a modelling tool for the sensing characteristics of complex fibre Fabry-Perot interferometers formed between chirped fibre Bragg gratings

Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2005-12-31)

Phase and spectral response characteristics of fibre Fabry-Perot interferometers (FFPI), formed between linearly chirped fibre Bragg gratings (FBG), were theoretically modelled using Rouard's method. The method models ...
A simple and wavelength-flexible procedure for fabricating phase-shifted fibre Bragg gratings

Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (Iop Publishing Ltd, 2010-09-30)

A simple procedure for fabricating phase-shifted fibre Bragg gratings (PSFBGs) that does not require the use of a phase-shifted phase mask is presented. Two standard fibre Bragg gratings (FBGs) of equal length and with the ...
A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength

Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2009-12-31)

A simple technique for fabricating phase-shifted fibre Bragg gratings (PSFBGs) without the use of a phase-shifted phase mask is presented. Two, 3-mm long, standard fibre Bragg gratings (FBGs) were inscribed sequentially ...
Simultaneous, independent measurement of temperature and strain using a tilted fibre Bragg grating

Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2007-12-31)

A single fibre Bragg grating is used to discriminate between temperature and strain by exploiting the core-cladding mode coupling of a tilted fibre Bragg grating (TFBG). The core and cladding modes exhibit different ...
Temperature and strain discrimination using a single tilted fibre Bragg grating

Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (Elsevier Science B.V., Amsterdam., 2007-07-15)

A fibre optic sensor capable of discriminating between temperature and strain, using a single fibre Bragg grating, is presented. The technique exploits the core–cladding mode coupling of a tilted fibre Bragg grating ...
A transverse loading technique to enhance the pressure measurement capability of fibre Bragg gratings

Correia, Ricardo N.; Chehura, Edmon; James, Stephen W.; Tatam, Ralph P. (International Society for Optical Engineering; 1999, 2008-12-31)

A fibre optic pressure sensor based on the application of a transverse load onto an epoxy-resin material embedded over a sub-section of a fibre Bragg grating (FBG) is presented. When a transverse load is applied to the ...

Browsing by Author "Chehura, Edmon"

Browsing by Author "Chehura, Edmon"

Search CERES

Browse

All of CERES

My Account