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Proceedings Paper

Silica-optical-fiber-based rare-earth-doped sensors
Author(s): Tong Sun; Kenneth T. V. Grattan; Scott A. Wade; David Forsyth
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Paper Abstract

This paper reports on work done with a range of silica fibres, doped with several important rare earth ions such as Er, Nd, Yb and Tm, to create a range of novel optical sensors. The approach reported herein is based on monitoring and analysis of the fluorescence decay from such fibres in the time domain as well as in the frequency domain. With these fibres, temperature sensors operating in the range from as low as -200 degree(s)C to beyond 1000 degree(s)C have been constructed. A temperature resolution of the order of a few degrees Celsius has been typically reported from these types of sensors. Fibre of this type has been used in a simple yet effective structural integrity monitoring system (being incorporated successfully into concrete samples) and an optical fire alarm system with potential applications for engine monitoring has been developed. A further recent discovery is a small level of strain sensitivity in such fibres - this has been explored over the region from 0 to 2000(mu) e, showing a level of resolution better than a few tens of microstrain, and sensors based on this effect are discussed and reported on in this work.

Paper Details

Date Published: 30 October 2001
PDF: 11 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447346
Show Author Affiliations
Tong Sun, City Univ. (UK) and Nanyang Technological Univ. (United Kingdom)
Kenneth T. V. Grattan, City Univ. (UK) (United Kingdom)
Scott A. Wade, City Univ. (UK) (United Kingdom)
David Forsyth, City Univ. (UK) (United Kingdom)

Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II
Anand Krishna Asundi; Wolfgang Osten; Vijay K. Varadan, Editor(s)

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