A Fabry-Perot interferometer strain sensor composed of a rounded rectangular air cavity with a thin wall for high sensitivity and interference contrast

作者：Li, Qiao; Wang, Jianxin; Mu, Haiwei; Lv, Jingwei; Yang, Lin; Shi, Ying; Yi, Zao; Chu, Paul K.; Liu, Qiang; Liu, Chao^*

来源：Optics Communications, 2023, 527: 128920.

DOI：10.1016/j.optcom.2022.128920

• Fabry-P?rot interferometer
• Air cavity
• Optical fiber sensor
• Strain sensitivity
• Interference contrast

A Fabry-Perot interferometer (FPI) strain sensor with high sensitivity and interference contrast is designed and fabricated by a simple, cost effective, and safe process which can be scaled up for commercial production. The excellent strain sensitivity of 8 pm/mu e and interference contrast of 25 dB stem from the special structure with the unique air cavity, small wall thickness, and excellent reflection surface of the air cavity. The strain -temperature cross-sensitivity of the sensor is only 0.59 mu e/degrees C in the temperature range of 20-80 degrees C. The sensor has large potential in applications such as strain sensing.