9 May 2012 Highly sensitive temperature and strain sensors based on all-fiber 45°-TFG Lyot filter
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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.
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Zhijun Yan, Zhijun Yan, Adebayo Adedotun, Adebayo Adedotun, Kaiming Zhou, Kaiming Zhou, Lin Zhang, 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); doi: 10.1117/12.921461; https://doi.org/10.1117/12.921461
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