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Proceedings Paper

Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter
Author(s): Zhijun Yan; Adebayo Adedotun; Kaiming Zhou; Lin Zhang
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Paper Abstract

We demonstrate highly sensitive temperature and strain sensors based on an all-fiber Lyot filter structure, which is formed by concatenating two 45°-TFGs (tilted fiber gratings) with a PM fiber cavity. The experiment results show the all-fiber 45°-TFG Lyot filter has very high sensitivity to strain and temperature. The 45°-TFG Lyot filters of two different cavity lengths (18cm and 40 cm) have been evaluated for temperature sensing by heating a section of the cavity from 10°C to 50°C. The experiment results have shown remarkably high temperature sensitivities of 0.616nm/°C for 18cm and 0.31nm/°C for 40cm long cavity filter, respectively. The 18cm long cavity filter has been subjected to strain variations up to around 550με and the filter has exhibited strain sensitivities of 0.02499nm/με and 0.012nm/με for two straining situations, where its cavity middle section of 18cm and 9cm were stretched, respectively.

Paper Details

Date Published: 9 May 2012
PDF: 8 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 843905 (9 May 2012); doi: 10.1117/12.921461
Show Author Affiliations
Zhijun Yan, Aston Univ. (United Kingdom)
Adebayo Adedotun, Aston Univ. (United Kingdom)
Kaiming Zhou, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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