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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 demodulation system design for fiber Bragg grating (FBG) temperature sensor is proposed. Based on the principle of direct digital synthesizer (DDS), the drive voltage of a tunable Fabry-Perot (F-P) filter is constructed by using a field programmable gate array (FPGA) with a peak-to-peak voltage of 10V. Proposed the use of FPGA control a number of analog / digital (A / D) converter to streamline the acquisition of data acquisition module to achieve four-channel detection. In order to increase real-time demodulation, real-time calibration function, to abandon the commonly used reference fiber, the introduction of comb filter. The FBG was calibrated and the designed demodulation system was tested at 30 ℃ ~ 100 ℃. The electronic thermometer and spectrometer were used to detect and compare the two sets of data to evaluate the performance of the designed demodulation system. The average temperature error is 0.19129 ℃, the minimum temperature difference is 0.045 ℃, resolution 1pm.