Analysis and Optimization of Thermodiffusion of an FBG Sensor in the Gas Nitriding Process

Tso-Sheng Hsieh; Yi-Chian Chen; Chia-Chin Chiang

doi:10.3390/mi7120227

Analysis and Optimization of Thermodiffusion of an FBG Sensor in the Gas Nitriding Process

Micromachines (Basel). 2016 Dec 12;7(12):227. doi: 10.3390/mi7120227.

Authors

Tso-Sheng Hsieh¹, Yi-Chian Chen², Chia-Chin Chiang³

Affiliations

¹ Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan. srcx2s904@gmail.com.
² Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan. al11062000@gmail.com.
³ Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan. ccchiang@kuas.edu.tw.

Abstract

In this paper, we report the numerical calculations for a thermo-optical model and the temperature sensitivity of a fiber Bragg grating (FBG) sensor. The thermally-induced behaviors of a FBG sensor in the gas nitriding process were analyzed for temperatures ranging from 100⁻650 °C. The FBG consisted of properly chosen photosensitive fiber materials with an optimized thermo-optic coefficient. The experimental and optimized thermo-optic coefficient results were consistent in terms of temperature sensitivity. In these experiments, the temperature sensitivity of the FBG was found to be 11.9 pm/°C.

Keywords: fiber Bragg grating; gas nitriding process; temperature sensitivity; thermo-optic coefficient.