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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、900 m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。
A heterodyne ranging experiment based on linear frequency-modulated laser is proposed, and a more specific measurement scheme is designed. The two beams with the same characteristics are obtained by using time-delay fiber, but the linear frequency-modulated laser with delay is mixed to measure The frequency of beat frequency is obtained, and then the frequency information contained therein is obtained. The simulation test and actual fiber delay verification are carried out by using Matlab-Simulink simulation. By simulating the chirp signal and chirp Process, heterodyne beat frequency of the linear frequency modulated laser echo signal and local oscillation signal at 300, 600 and 900m respectively are obtained, and the corresponding beat values are obtained. The result is in good agreement with the theoretical calculation.