Abstract

A dual cross-axis interference polarization-maintaining fiber interferometer (DCAI-PMFI) for simultaneous measurement of strain and temperature is proposed. By using the cross-interference of the fast and slow axes in the polarization-maintaining fiber interferometer with dual axis independent detection, common path dual cross-axis interferometers (DCAIs) are realized. Since the fast and slow axes are different in refractive index and thermo-optic coefficient, the DCAIs have different phase sensitivities to strain and temperature. A sensitivity matrix for simultaneous measurement of temperature and strain is constructed. The temperature phase sensitivities can be adjusted by changing the length ratio of two arms of the DCAI-PMFI to optimize the decoupling performance of temperature and strain. It is found that the temperature sensitivities are opposite signs when the length ratio of two arms is between the ratio of the temperature optical path coefficients of the fast and slow axis and its reciprocal, and the best measurement resolution can be obtained when two arms are equal in length. In the experimental setup of DCAI-PMFI with equal length of two arms, the strain sensitivities are 1.5648 rad/με and 1.5790 rad/με respectively at 0.35m strain sensing fiber, the temperature sensitivities are −25.4990 rad/°C and 24.6000 rad/°C respectively at 10m arm length, the resolutions are 2.4 με in strain and 0.02°C in temperature. The experimental results show that the proposed sensor can solve the crosstalk between strain and temperature of interferometer, and can be applied to various interferometric fiber sensors without changing the topology.

Simultaneous measurement of salinity and temperature using a Sagnac interferometer based on concatenated polarization-maintaining fiber tapers

Chengkun Yang, Shengqi Zhang, Donglei Shi, Yichang Wu, Zihan Cao, and Zhengyong Liu
Appl. Opt. 60(28) 8904-8909 (2021)

Temperature and strain simultaneous sensing measurement based on an all-fiber Mach-Zehnder interferometer and fiber Bragg grating

Junjie Zhu, Wei He, Shaode Li, Zhihan Li, and Lianqing Zhu
Appl. Opt. 62(25) 6661-6671 (2023)

Simultaneous strain and temperature measurement using a compact photonic crystal fiber inter-modal interferometer and a fiber Bragg grating

Bo Dong, Jianzhong Hao, Chin-yi Liaw, Bo Lin, and Swee Chuan Tjin
Appl. Opt. 49(32) 6232-6235 (2010)

Simultaneous measurement of strain and temperature by employing fiber Mach-Zehnder interferometer

Jiangtao Zhou, Changrui Liao, Yiping Wang, Guolu Yin, Xiaoyong Zhong, Kaiming Yang, Bing Sun, Guanjun Wang, and Zhengyong Li
Opt. Express 22(2) 1680-1686 (2014)

Simultaneous multi-point measurement of strain and temperature utilizing Fabry-Perot interferometric sensors composed of low reflective fiber Bragg gratings in a polarization-maintaining fiber

Quoc Hung Bui, Atsushi Wada, Koken Fukushima, Koki Nakaya, Manuel Guterres Soares, and Satoshi Tanaka
Opt. Express 28(9) 13104-13115 (2020)