光学与光电技术, 2015, 13 (5): 23, 网络出版: 2015-11-30   

基于DFB激光器的FBG功率解调测温系统实验研究

Research on FBG Temperature Measurement Power Demodulation System Based on Distributed Feedback Laser
作者单位
安徽工业大学电气信息学院, 安徽 马鞍山 243000
摘要
基于分布反馈式激光器的功率选择特性将波长信息转换为功率值,利用FBG中心波长与温度之间的线性关系,设计了一种基于DFB激光器的FBG功率解调方案,并将其应用于环境温度的监测实验。采用DFB激光器作为系统光源,则FBG的反射光功率将反映其波长改变,通过光电转换、信号放大和滤波将光功率转换为电信号并送入ARM Cortex-M4 Kinetis60微控制器。实验结果表明,当环境温度在30 ℃~60 ℃升温及降温变化过程中,FBG的反射光功率信号与温度之间的灵敏度可达到0.539 6 dBm/℃,线性拟合度为0.970 5,同时,在温度变化范围较小时,系统获得的电信号与FBG温度之间的灵敏度为0.058 3 V/℃,线性拟合度为0.958 9,验证了系统方案的可行性。
Abstract
Based on the power selection property of distributed feedback laser, and the linear relation between Bragg wavelength and the temperature, a FBG temperature measurement power demodulation scheme base on DFB is designed and performed to experiment. The wavelength signal of reflected light of FBG is converted to power signal when the light source of system is DFB laser. The power signal of light is converted to a voltage signal after the process of photoelectric convert, amplify and filtering, then the voltage is sent to the ARM Cortex-M4 Kinetis60 micro-controller. The experiment results show that When FBG temperature range is from 30 ℃ to 60 ℃, the sensitivity between the dBm value of FBG reflect light and the FBG temperature is 0.539 6 dBm/℃, the fitting coefficient is 0.970 5; when temperature rang is small, the sensitivity between the amplitude of the filtered voltage signal and FBG temperature is 0.058 3 V/℃, the fitting coefficient is 0.958 9, verified the feasibility of the introduced FBG demodulation scheme.

汪诚伟, 王彦, 朱业青, 孟浩玉. 基于DFB激光器的FBG功率解调测温系统实验研究[J]. 光学与光电技术, 2015, 13(5): 23. WANG Cheng-wei, WANG Yan, ZHU Ye-qing, MENG Hao-yu. Research on FBG Temperature Measurement Power Demodulation System Based on Distributed Feedback Laser[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2015, 13(5): 23.

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