Optical fiber strain sensor with high and tunable sensitivity

Shiwei Yang; Qiang Zhang; Xiaobo Li; Quansen Wang; Yongmin Li

doi:10.1063/5.0154895

Optical fiber strain sensor with high and tunable sensitivity

Rev Sci Instrum. 2023 Nov 1;94(11):115003. doi: 10.1063/5.0154895.

Authors

Shiwei Yang¹, Qiang Zhang^{1

2}, Xiaobo Li¹, Quansen Wang¹, Yongmin Li^{1

2}

Affiliations

¹ State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China.
² Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.

PMID: 37938069
DOI: 10.1063/5.0154895

Abstract

We demonstrate a fiber-optic strain sensor with high and tunable sensitivity by constructing a Fabry-Perot interferometer with tunable stretching length. By improving the ratio of stretching length to interference length for the proposed sensor, the measured strain sensitivity is up to 1932 pm/με, which is an order of magnitude higher than the maximum value of reported fiber-optic strain sensors so far. The sensitivity for a prepared sensor could be also tuned conveniently by changing the stretching length, and experimental results show that the sensitivity could be tuned from 1932 to 978 pm/με by reducing the stretching length from 12 to 6 mm. Furthermore, the proposed device is economical, straightforward, robust, and reproducible. The advantages make the proposed device promising in practical applications.