基于FPGA的FBG温度传感器解调系统设计  

Design of Demodulation System of Fiber Bragg Grating Temperature Sensor Based on FPGA

作　　者：郎月[1] 佟首峰[1] 

机构地区：[1]长春理工大学空间光电技术研究所,吉林长春130022

出　　处：《激光与光电子学进展》2013年第9期19-23,共5页Laser & Optoelectronics Progress

摘　　要：提出一种针对光纤布拉格光栅（FBG）温度传感器的解调系统设计。基于直接数字合成器（DDS）原理，利用现场可编程门阵列（FPGA）构成可调法布里-珀罗（F-P）滤波器的驱动电压，电压峰峰值可达10V。提出利用FPGA控制多个模／数（A／D）转换器来流水线式读取数据构成采集模块，实现四通道检测。为增加解调的实时性，实现实时校准功能，摒弃常用的参考光纤，引入梳状滤波器。对FBG进行定标，并在30℃～100℃间对所设计的解调系统进行检测，利用电子温度计与光谱仪同时检测，比较两组数据来对设计的解调系统进行性能评估。平均温度误差为0．19129℃，最小温度差值为0．045℃，分辨率1pm。A design scheme of demodulation system based on field programmable gate array （FPGA） for fiber Bragg grating（FBG） temperature sensor is proposed. Using the principle of （direct digital synthesizer （DDS）, the drive voltage of Fabry-Perot （F-P） filter is constituted by FPGA. It can achieve 10 V. Many analog-to-digital （A/D） converters are controlled by FPGA to make up the successive data acquisition module. It can get the result in real time. The comb-shaped filter is used to correct the system in time. The index of a FBG sensor is calibrated confirmed. The system is used for denodulation between 30℃ and 100℃, and electronic thermometer and spectrograph are used to get the accurate result. The different records can be compared to assess the performance of system. The mean error of temperature is 0. 19129 ℃ , and the minimum temperature is 0. 045℃, with the resolution being 1 pm.

关 键 词：光纤光学 解调系统 现场可编程门阵列 法布里-珀罗滤波器 

分 类 号：O433[机械工程—光学工程]