溯源北斗时基无光学干涉激光扫频测距实验研究  

Experimental research of scanned-frequency laser ranging based on Beidou time base tracing and non-optical interference

作　　者：游淞清 谢博娅 伍凯凯 何静 杨鹏 You Songqing;Xie Boya;Wu Kaikai;He Jing;Yang Peng(Hubei Key Laboratory of Modern Manufacturing Quality Engineering,Hubei University of Technology,Wuhan 430068,China;Laboratory of Precision Optical Measurement,School of Electrical and Electronic Information Engineering,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]湖北工业大学湖北省现代制造质量工程重点实验室,湖北武汉430068 [2]湖北理工学院电气与电子信息工程学院精密光学测量实验室,湖北黄石435003

出　　处：《红外与激光工程》2023年第5期348-356,共9页Infrared and Laser Engineering

基　　金：国家自然科学基金(12074110,11947134);湖北省教育厅科研项目(B2021251);湖北省智能输送技术与装备重点实验室项目(2021XZ108)。

摘　　要：绝对距离测量在基础科学和技术研发领域的重要性日益彰显。由于传统的光学干涉绝对距离测量方法存在测量距离较短、“位相模糊”、易受噪声干扰等问题,计量学领域提出利用频率合成激光开展非光学干涉的绝对距离测量研究。尽管该方法实验装置简单、具有较强的抗噪声干扰能力、适用于大尺寸测量等优点,然而它对实验装置的工作频率带宽、精度具有较高的要求,先前的工作受限于以上条件,绝对距离测量精度为厘米量级。为进一步提高测距精度,提出一种溯源北斗时间基准的非光学干涉激光扫频测距方法。采用光纤电光调制器,代替空间声光调制器,激光频率扫描范围从10 MHz提高到100 MHz;采用北斗/GPS时钟作为信号源的外部基准,频率精度达到0.03 ppm(1 ppm=10^(-6));采用电子学外差探测与自混频相结合的方案,将高频交流光电流信号解调出低频绝对距离信息,降低了环境噪声和电子学噪声。实验得到绝对距离测量结果9.8436 m,测量精度1.25 mm。该方法减小了设备时基频率误差对测量结果的影响,实现大尺度测量同时测距精度比先前的工作提高了一个数量级,具有广泛的应用前景。Objective The emergence and development of laser ranging technology has solved the problem that traditional measurement methods cannot take into account large-scale and high-precision measurement.It has the advantages of high resolution,large measurement range,and easy integration,which promotes the development of remote sensing,radar,equipment manufacturing and other related fields.Although the existing laser ranging technology has made great progress in terms of ranging range and resolution,it is easily affected by interfering signals in space and equipment time base frequency errors during the ranging process,resulting in laser signal.The echo is easily disturbed by noise during the propagation process,which affects the measurement accuracy.Therefore,a large-scale,high-precision,and traceable ranging method is an urgent requirement in current practical engineering applications.Aiming at the problems of being susceptible to environmental noise interference and frequency traceability in laser ranging applications,this paper studies the method of dual-frequency optical scanning ranging without optical interference that traces the Beidou time base.This method has strong anti-interference ability against noise.The Beidou time base improves the accuracy and stability of laser modulation,and provides a new research idea for absolute distance measurement.Methods In this paper,a theoretical model of dual-frequency optical scanning ranging without optical interference is established,and the relationship among distance,signal phase and scanning frequency is obtained.A Beidou/GPS dual-mode clock is designed as the frequency reference of the ranging experiment device to achieve the effect of remote source tracing(Fig.6).An experimental device of distance measurement was built,and a dual-frequency laser was prepared based on a fiber electro-optic modulator,which has the advantages of large frequency tuning range and fast scanning speed(Fig.10).A demodulation scheme combining electronic heterodyne detection and self-mixing i

关 键 词：绝对距离测量 GPS/BDS 无光学干涉 时基校准 

分 类 号：O439[机械工程—光学工程]