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17 September 2020 Strain and temperature sensor based on S-taper embedded in long-period grating
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Abstract

A Mach–Zehnder interferometer based on S-taper embedded in long-period grating (LPG) for simultaneous measurement of strain and temperature is proposed. The LPG is written using CO2 laser in a single-mode fiber. Then an S-taper is made by putting the LPG in a fusion splicer and applying off-axis pull at the middle point. The spectral characteristics of strain and temperature are investigated theoretically and experimentally. The experimental results show that the maximum strain sensitivity is 53.6  pm  /  με within a strain range of 0 to 373.13  με. In additionally, the proposed sensor has a maximum temperature sensitivity of 70  pm  /    °  C when the temperature varies from 30°C to 90°C. Further analysis shows that this sensor could be applied for simultaneous measurement of strain and temperature.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Meiqi Li, Ye Cao, Hao Zhang, Wenwen Wu, Bo Liu, Ting Liu, Shaoxiang Duan, and Yange Liu "Strain and temperature sensor based on S-taper embedded in long-period grating," Optical Engineering 59(9), 097105 (17 September 2020). https://doi.org/10.1117/1.OE.59.9.097105
Received: 9 July 2020; Accepted: 3 September 2020; Published: 17 September 2020
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