光子学报, 2018, 47 (4): 0412003, 网络出版: 2018-03-15
一种结合两类相位调制激光多普勒频移测量的方法
Research on a Combination of Two Kinds of Phase-modulated Laser Doppler Shift Measurement Methods
激光雷达 多普勒频移 相位调制 拍频 Fabry-Perot干涉仪 Lidar Doppler shift Phase modulation Beat frequency Fabry-Perot interferometer
摘要
提出了一种新的激光多普勒频移测量方法, 该方法以相位调制拍频信号振幅和相位作为自变量定义新函数, 并以该函数作为多普勒频移鉴频参量, 将两类相位调制激光多普勒频移测量方法结合.理论上将该方法的鉴频曲线、灵敏度曲线以及误差曲线等与两类相位调制方法的相应曲线进行比较, 发现该方法不但继承了相位调制拍频信号振幅方法的工作方式, 能够对小频移量进行测量, 而且吸收了相位调制拍频信号相位方法的测量能力, 具有更高的测量灵敏度和动态范围.通过实验对硬目标反射的频移可控信号光进行测量, 证明了理论的正确性, 而且通过调整平移参数, 可以使该方法的测量动态范围提高约26.8%, 更适合对高多普勒频移量进行测量.
Abstract
This paper presents a novel laser Doppler shift measurement method. The propoed method uses the amplitude and phase of the phase-modulated beat signal as independent variables to define a new function and uses the function as a Doppler-shifted frequency-discriminating parameter. The purpose of the proposed method is to combine the two phase-modulated laser Doppler frequency shift measurement methods. In theory, the frequency-discriminating curve, the sensitivity curve and the error curve of the proposed method are respectively compared with the corresponding curves of the two types of phase-modulated methods. It is found that the propoed method not only inherits the working mode of the phase-modulated beat frequency signal amplitude method to measure the small frequency shift amount, but also absorbs the measurement ability of the phase-modulated beat frequency signal phase method to obtain higher measurement sensitivity and dynamic range. The hard-target reflected frequency-shifted controllable signal light is measured. The experimental results not only prove the correctness of the theory, but also prove that by adjusting the translation parameters, the dynamic range of the new method can be improved by about 26.8%, which is more suitable for measuring the high Doppler frequency shift.
杨娜, 杜军, 曲彦臣, 赵卫疆. 一种结合两类相位调制激光多普勒频移测量的方法[J]. 光子学报, 2018, 47(4): 0412003. YANG Na, DU Jun, QU Yan-chen, ZHAO Wei-jiang. Research on a Combination of Two Kinds of Phase-modulated Laser Doppler Shift Measurement Methods[J]. ACTA PHOTONICA SINICA, 2018, 47(4): 0412003.