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Proceedings Paper

Fibre optic polarimetric temperature sensor using low coherence source employing intensity and wavelength compensation
Author(s): Michael Mondanos; Ian Giles; Kenneth Weir
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Paper Abstract

This paper describes a remote polarimetric low coherence temperature sensing system employing intensity and wavelength compensation mechanisms. Possible interconnection interference effects and system polarisation dependent losses are minimized using a broadband (low coherence) optical source followed by a fibre Lyot-type depolariser. The sensor was optimized to operate over a temperature range of 160° C corresponding to the linear region of the interferometric response. A high extinction broadband fibre polariser (>40 dB) was fabricated to achieve maximum modulation depth. The intensity referencing scheme employed allows the remote operation of the sensor and can compensate up to 90% attenuation along the fibre line without any loss of resolution. The wavelength referencing scheme discriminates against temperature dependent shift of the source spectra and minimizes possible measurement errors. The modular structure of the system can be expanded to accommodate a number of sensors.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623280
Show Author Affiliations
Michael Mondanos, Imperial College London (United Kingdom)
Ian Giles, Phoenix Photonics (United Kingdom)
Kenneth Weir, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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