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Proceedings Paper

Optical fiber temperature and strain sensing system based on high accuracy time delay measurement
Author(s): Xi Liu; Shupeng Li; Xiangchuan Wang; Shilong Pan
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Paper 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.

Paper Details

Date Published: 12 March 2020
PDF: 8 pages
Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 114360S (12 March 2020); doi: 10.1117/12.2550102
Show Author Affiliations
Xi Liu, Nanjing Univ. of Aeronautics and Astronautics (China)
Shupeng Li, Nanjing Univ. of Aeronautics and Astronautics (China)
Xiangchuan Wang, Nanjing Univ. of Aeronautics and Astronautics (China)
Shilong Pan, Nanjing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 11436:
2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Xuping Zhang; Hai Xiao, Editor(s)

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