调频连续波光纤位移传感器快速信号处理方法  

Fast Signal Processing Method for Frequency-Modulated Continuous-Wave Interferometric Fiber-Optic Displacement Sensor

作　　者：盛启明 郑刚 张雄星[2] 韩园 郭媛 聂梦笛 Sheng Qiming;Zheng Gang;Zhang Xiongxing;Han Yuan;Guo Yuan;Nie Mengdi(School of Electronic Information Engineering,Xi’an Technological University,Xi’an,Shaanxi 710021,China;School of Optoelectronic Engineering,Xi’an Technological University,Xi’an,Shaanxi 710021,China)

机构地区：[1]西安工业大学电子信息工程学院,陕西西安710021 [2]西安工业大学光电工程学院,陕西西安710021

出　　处：《激光与光电子学进展》2021年第21期133-141,共9页Laser & Optoelectronics Progress

摘　　要：针对传统鉴相算法对拍频信号处理速度较慢的问题,提出一种基于数字信号处理(DSP)技术的调频连续波光纤位移传感器快速信号处理方法。以DSP技术为核心,通过直接内存访问(DMA)实现数据的快速传输,利用多固定点峰值预测鉴相算法对拍频信号进行快速解算并进行方向优化。实验结果表明:在600 mm的动态测量范围内,位移测量的标准差小于5 nm,线性拟合系数在0.99997以上,对被测目标的适应速度达到15 mm/s,该方法能够实现较高的测量精度和更快的动态测量速度。In view of the problems that the slow processing speed of the traditional phase detection algorithm on the beat signal,a fast signal processing method of frequency-modulated continuous-wave interferometric fiber-optic displacement sensor based on digital signal processing(DSP)technology is proposed.With the DSP technology as the core,fast data transmission is realized through direct memory access(DMA),and the multi-fixed-point peak prediction phase detection algorithm is used to quickly solve the beat signal and optimize the direction.The experimental results show that in the dynamic measurement range of 600 mm,the standard deviation of displacement measurement is less than 5 nm,the linear fitting coefficient is above 0.99997,and the adaptive speed to the measured target reaches 15 mm/s.The proposed method can achieve higher measurement accuracy and faster dynamic measurement speed.

关 键 词：测量 位移测量 多固定点峰值预测鉴相 调频连续波 测量速度 

分 类 号：TH741[机械工程—光学工程] TN247[机械工程—仪器科学与技术]