长周期光纤光栅解调的FBG温度传感系统

Fiber Bragg Grating Temperature Sensor with LPG Modulation

长周期光纤光栅是特定波长范围内的线性滤波器件,该文设计了长周期光纤光栅解调的布拉格光纤光栅温度传感系统。在布拉格温度传感器中,布拉格光纤光栅的反射波中心波长随温度的改变会引起一定程度的漂移,设计布拉格光纤光栅的波长变化在长周期光纤光栅的线性吸收区域,可以使长周期光纤光栅对布拉格光纤光栅的反射波长的吸收随波长而改变,随后使用光电传感器可以得到电信号与温度信号的相对应关系,从而把温度信号转换成了电信号。对该系统的测试及仿真结果证明,该系统有很好的温度检测功能。

Long period fiber grating （LPG） is designed as the filter component of edge linear filtering demodulation system for fiber Bragg grating（FBG） temperature sensor. Reflective center wavelength of FBG will change with the difference of temperature, and LPG can resolve the different center wavelength. The sensor system is configured, and the theory of LPG to resolve wavelength is explained. The results of LPG demodulation system are concluded based on the analysis of FBG and LPG function to the wavelength. Good temperature detection function of this system is concluded from the measurement and simulation.