基于F-P可调谐滤波器的光纤光栅解调系统设计  

Design of fiber grating demodulation system based on F-P tunable filter

作　　者：文丰[1] 张岩 贾兴中[1] Wen Feng;Zhang Yan;Jia Xingzhong(State Key Laboratory of Testing Technoligy,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学电子测试技术重点实验室,太原030051

出　　处：《电子测量技术》2022年第9期38-43,共6页Electronic Measurement Technology

摘　　要：针对某结构应力监测系统,提出应用光纤光栅传感原理来测量结构应力,设计了基于光纤标准具的F-P可调谐滤波器光纤光栅解调系统。利用标准具的稳定性来对F-P滤波器进行标定,消除环境温度对F-P滤波器的干扰。利用DDS原理设计了F-P滤波器的驱动源,产生的三角波分辨率可以小于0.42 mV,确保解调系统最终的分辨率达到1 pm。设计了光电转换电路,实现了微弱光信号的转换和放大,最后转换成易于采集与显示的电压信号。最终,利用本次设计的解调系统可以实现±3 000με的应变测量,测量精度可达到2.59%。Aiming at a structural stress monitoring system, it is proposed that using the principle of fiber grating sensing to measure structural stress.A F-P tunable filter fiber grating demodulation system based on fiber etalon is designed. Using the stability of the etalon to calibrate the F-P filter to eliminate the interference of the ambient temperature on the F-P filter. The driving source of the F-P filter is designed by using the DDS principle, and the resolution of triangle wave can be less than 0.42 mV, ensuring that the final resolution of the demodulation system reaches 1 pm. The photoelectric conversion circuit is designed to realize the conversion and amplification of the weak light signal, and finally it is converted into a voltage signal that is easy to collect and display. Finally, the demodulation system designed in this paper can achieve a strain measurement of ±3 000 με, and the measurement accuracy can reach 2.59%.

关 键 词：光纤光栅 F-P滤波器 光纤标准具 DDS 应变 

分 类 号：TN253[电子电信—物理电子学]