Optical fiber temperature and strain sensing system based on high accuracy time delay measurement

Xi Liu; Shupeng Li; Xiangchuan Wang; Shilong Pan

doi:10.1117/12.2550102

12 March 2020 Optical fiber temperature and strain sensing system based on high accuracy time delay measurement

Xi Liu, Shupeng Li, Xiangchuan Wang, Shilong Pan

Proceedings Volume 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 114360S (2020) https://doi.org/10.1117/12.2550102
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

An optical fiber temperature and strain sensing system based on phase-derived optical fiber time delay (OFTD) measurement is proposed. By detecting the phase different between probe and intrinsic microwave signals, high accuracy delay measurement can be obtained. As the OFTD in single mode fiber (SMF) changes linearly with the strain or temperature in a certain range, strain and temperature sensing can be achieved by measuring the change of OFTD with high accuracy. In the experiments, the delay measurement accuracy can reach 0.06 ps when the accuracy of phase detector is ±0.1 degree while the detecting frequency is 4.5 GHz. In addition, an accuracy of ±11 με for strain sensing with 1.5 m fiber and a resolution better than 0.24 °C for temperature sensing with 10.66 m fiber are achieved.

Citation Download Citation

Xi Liu, Shupeng Li, Xiangchuan Wang, and Shilong Pan "Optical fiber temperature and strain sensing system based on high accuracy time delay measurement", Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 114360S (12 March 2020); https://doi.org/10.1117/12.2550102

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KEYWORDS

Sensing systems

Optical fibers

Temperature metrology

Time metrology

Phase measurement

Single mode fibers

Modulation

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