FBG temperature sensor based on edge filtering of TFBG
In order to improve the temperature sensitivity of the system,a fiber Bragg grating(FBG)temperature sensor based on tilted fiber Bragg grating(TFBG)edge filter is designed.In this system,a fiber ring mirror is introduced into the conventional TF-BG edge filter demodulation system to reflect the transmitted light signal from TFBG back,so that it can pass through TFBG a-gain,increase the depth of TFBG transmission spectrum,and encapsulate the sensor grating.The experimental results show that the drift of the center wavelength of the sensor grating before and after packaging is 0.55 nm and 7 nm respectively,and the drift of the sensor grating after packaging is expanded by more than ten times.At the same time,because the slope of the demodulation transfer function of TFBG edge filter is improved,the temperature sensitivity of the sensor after wavelength demodulation is also improved,which is 1.6～2.4 times that of the uncascaded optical fiber ring mirror sensor.
国家科技期刊平台
NSTL
万方数据
维普
