Abstract

Multiple fiber Bragg gratings (FBGs) have been proposed and demonstrated for gas-flow measurements in a flow channel, using the temperature-difference method. This sensor consists of two FBG temperature sensors and two coil heaters. Coil heaters are used to heat the FBGs. The flow rate of the gas can be obtained by monitoring the difference in the Bragg-wavelength shifts of the two FBGs, which has features that exclude the effect of temperature fluctuations. In this study, experiments are conducted to measure the wavelength shift based on the flow rate, and to evaluate the gas-flow rate in a gas tube. Experimental results show that the sensor has a linear characteristic over a flow-rate range from 0 to 25 ℓ/min. The measured sensitivity of the sensor is 3.2 pm/(ℓ/min) at a coil current of 120 mA.

© 2022 Optical Society of Korea

Use of a single-multiple-single-mode fiber filter for interrogating fiber Bragg grating strain sensors with dynamic temperature compensation

Qiang Wu, Agus Muhammad Hatta, Yuliya Semenova, and Gerald Farrell
Appl. Opt. 48(29) 5451-5458 (2009)

Use of dual-grating sensors formed by different types of fiber Bragg gratings for simultaneous temperature and strain measurements

Xuewen Shu, Donghui Zhao, Lin Zhang, and Ian Bennion
Appl. Opt. 43(10) 2006-2012 (2004)

Fiber Bragg grating temperature sensor with controllable sensitivity

Jaehoon Jung, Hui Nam, Byoungho Lee, Jae Oh Byun, and Nam Seong Kim
Appl. Opt. 38(13) 2752-2754 (1999)

Pulp chamber temperature variation evaluation using fiber Bragg grating sensor

Shweta Pant, Sharath Umesh, and Sundarrajan Asokan
Appl. Opt. 59(34) 10953-10958 (2020)

Ultra-high-temperature sensing using fiber grating sensor and demodulation method based on support vector regression optimized by a genetic algorithm

Yingjie Li, Tao Chen, Jinhai Si, Ruidong Lv, Xiao Niu, Bo Gao, and Xun Hou
Opt. Express 31(3) 3401-3414 (2023)