Abstract

In this work, the effect of the polar groups modified polyimide fiber Bragg grating relative humidity sensor was studied. Polyimide films containing different polar groups were deposited on fiber Bragg gratings by an impregnating method to form different relative humidity (RH) sensors. The experimental results show that the addition of a carboxyl group and a hydroxyl group in the synthesis could improve the humidity sensitivity (2.28 and 1.59 times, respectively) from 35% RH–95% RH. The sensor based on modified polyimide still has good linear response to humidity and temperature. In addition, the sensors containing a carboxyl group and a hydroxyl group can shorten the response time of the humidity sensor and improve the stability of the sensor at the same time.

© 2020 Optical Society of America

Optical fiber humidity sensor based on the direct response of the polyimide film

Ce Bian, Manli Hu, Ruohui Wang, Tingting Gang, Rongxin Tong, Lisong Zhang, Teng Guo, Xiaobo Liu, and Xueguang Qiao
Appl. Opt. 57(2) 356-361 (2018)

Relative humidity sensor with optical fiber Bragg gratings

Pascal Kronenberg, Pramod K. Rastogi, Philippe Giaccari, and Hans G. Limberger
Opt. Lett. 27(16) 1385-1387 (2002)

High-performance humidity sensor based on a micro-nano fiber Bragg grating coated with graphene oxide

Meng Tian, Yanhua Huang, Cong Li, and Min Lv
Opt. Express 28(18) 26395-26406 (2020)

In-fiber Mach–Zehnder interferometer based on multi-core microfiber for humidity and temperature sensing

Junni Cheng
Appl. Opt. 59(3) 756-763 (2020)

High-sensitivity optical fiber relative humidity probe with temperature calibration ability

Lei Liang, Hao Sun, Nan Liu, Hao Luo, Tingting Gang, Qiangzhou Rong, Xueguang Qiao, and Manli Hu
Appl. Opt. 57(4) 872-876 (2018)