Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter

Zhijun Yan; Adebayo Adedotun; Kaiming Zhou; Lin Zhang

doi:10.1117/12.921461

9 May 2012 Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter

Zhijun Yan, Adebayo Adedotun, Kaiming Zhou, Lin Zhang

Proceedings Volume 8439, Optical Sensing and Detection II; 843905 (2012) https://doi.org/10.1117/12.921461
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

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.

Citation Download Citation

Zhijun Yan, Adebayo Adedotun, Kaiming Zhou, and Lin Zhang "Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter", Proc. SPIE 8439, Optical Sensing and Detection II, 843905 (9 May 2012); https://doi.org/10.1117/12.921461

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