Abstract

A high sensitivity optical fiber temperature and gas pressure sensor with integrated micro-cavity is proposed. First, a single-mode optical fiber (SMF) is spliced with a section of capillary, and then the sensitive material polydimethylsiloxane (PDMS) is filled into the capillary to form a Fabry–Perot interferometer (FPI). Finally, a femtosecond laser is used to ablate the fiber core of the SMF to form the third reflecting surface, constituting two cascaded FPIs. When two FPIs have a similar free spectral range, a Vernier effect is produced. The temperature and gas pressure sensitivity of the sensor reached 14.41 nm/°C and 113.82 nm/MPa, respectively, after using the sensitive material and Vernier effect double sensitization technology. In addition, a fiber Bragg grating is cascaded with the sensor, which can realize the simultaneous measurement of temperature and gas pressure and eliminate cross-sensitivity.

© 2023 Optica Publishing Group

Ultra-sensitive temperature and pressure sensor based on PDMS-based FPI and Vernier effect

Jiao Song, Simei Sun, Chao Jiang, Ning Chen, Wenbo Jiang, Changning Liu, Jie Ren, and Saiyu Wang
Opt. Lett. 48(7) 1674-1677 (2023)

Composite Fabry–Perot interferometric gas pressure and temperature sensor utilizing four hole fiber with sensitivity boosted by high-order harmonic Vernier effect

Ling Chen, Jiajun Tian, Qiang Wu, Jiewen Li, Yong Yao, and Jiawei Wang
Opt. Express 31(15) 24988-25003 (2023)

Highly sensitive gas pressure sensor based on the hollow core Bragg fiber and harmonic Vernier effect

Yu Wang, Yaxi Yan, Weihao Yuan, Zhenggang Lian, Daru Chen, Alan Pak Tao Lau, Changyuan Yu, and Chao Lu
Opt. Lett. 48(8) 1990-1993 (2023)

Highly sensitive gas pressure sensor based on the enhanced Vernier effect through a cascaded Fabry-Perot and Mach-Zehnder interferometer

Xiping Zhu, Chao Jiang, Hailin Chen, Yuan Wang, Simei Sun, Han Zhang, Pei Wang, and And Huiling Huang
Opt. Express 30(19) 34956-34972 (2022)

Highly sensitive fiber optic temperature and strain sensor based on an intrinsic Fabry–Perot interferometer fabricated by a femtosecond laser

Tiago Paixão, Francisco Araújo, and Paulo Antunes
Opt. Lett. 44(19) 4833-4836 (2019)