基于连续线性调频激光器的测距方法.pdfVIP

第44卷第6期 红外与激光工程 2015年6 月 Vol.44No.6 InfraredandLaserEngineering Jun. 2015 基于连续线性调频激光器的测距方法 曲 杨，王春晖，高 洁，廖远东 (哈尔滨工业大学 可调谐激光技术国家级重点实验室，黑龙江哈尔滨 150080) 摘 要院提出了一种基于线性调频激光器的外差测距实验理论，设计了一个较为具体的测距方案，利 用延时光纤将两束特性相同、但进行了延时的线性调频激光进行混频，测出其拍频后的频率值，进而 得到其中包含的频率信息，并用Matlab-Simulink仿真对此方案进行了仿真测试和实际光纤延时验 证，通过模拟线性调频信号和线性调频外差测距的实验过程，分别对300、600、900m 处的线性调频激 光回波信号和本振信号进行外差拍频，得到相应的拍频值，其结果与理论计算结果基本吻合。 关键词院连续线性调频激光器； 外差； 测距； Matlab-Simulink仿真 中图分类号院O436 文献标志码院A 文章编号院1007-2276(2015)06-1779-05 Ranging measurement based on linear frequency modulated continuous laser Qu Yang, Wang Chunhui, Gao Jie, Liao Yuandong (National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150080, China) Abstract: A ranging measurement based on Linear Frequency Modulated Continuous Laser(LFMCL) heterodynes method was investigated and the system of distance measurement was designed. Mixed the two linear frequency modulated laser beams of the same characteristics which were delayed by delay fiber in different time. Then get the frequency value which contains the ranging information, and simulated by Matlab-Simulink. By the procedure of the linear FM signal and simulation of the linear FM heterodyne ranging, get the the frequency difference of the heterodynes in the distance of 300meter, 600 meter and 900 meter, the results show that simulation makes a coincidence with the theoretical arithmetic. Key words: linear frequency modulated continuous laser; heterodynes; distance measurement; Matlab-Simulink simulation 收稿日期院2014-10-05曰 修订日期院2014-11-09 基金项目院国家自然科学基金 作者简介院曲杨(1982-)袁男袁博士生袁主要从事激光雷达方