Low-temperature cross-sensitivity strain sensor based on a microbubble Fabry-Perot interferometer with a thin wall

作者：Lv, Jingwei; Li, Wei; Meng, Tongyu; Li, Qiao; Wang, Jianxin; Xu, Xinchen; Wang, Debao; Liu, Wei; Liu, Chao^*; Chu, Paul K.

来源：Optical Fiber Technology, 2023, 80: 103452.

DOI：10.1016/j.yofte.2023.103452

• Fabry-Perot interferometer
• Air bubble
• Optical fiber sensor
• Strain sensitivity
• Temperature cross-sensitivity

\A Fabry-Perot interferometer (FPI) strain sensor with low-temperature cross-sensitivity is prepared by a simple, cost-effective, and safe process. The sensor is fabricated by splicing two segments of the single-mode fiber and several arc discharges to form a unique circular bubble and a thin wall. The thin air-bubble wall deforms more easily under stress due to the good stress concentration ability of the tapered structure, resulting in a high strain sensitivity of 10.78 pm/mu e. The temperature sensitivity of the sensor is 1.24 pm/degrees C and the temperature cross-sensitivity is 0.115 mu epsilon/degrees C in the temperature range of 25 to 200 degrees C, which reduces the temperature-induced measurement error. The experimental results show that the sensor with good stability and repeatability has large commercial potential in measuring strain in complex environments.