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提出了一种激光多普勒频移测量方法,此方法利用正弦相位调制使信号光在原频率成分基础上产生正负一阶边带,再由Fabry-Perot干涉仪对调制光振幅和相位进行调整,使其产生固定频率的拍频信号,利用此拍频信号的振幅随频率变化而变化的性质来进行多普勒频移测量.通过理论分析证明该方法具有很高的测量精度,加工装调难度不大,兼顾了普通相干与非相干探测方法的优势.另外通过实验证明该方法的正确性与可行性,并通过与普通非相干方式比较发现该方法在测量精度上可以提高约1个数量级.
A laser Doppler shift measurement method is proposed. This method uses sine phase modulation to generate positive and negative first-order sidebands on the basis of the original frequency components, and then the amplitude and phase of the modulated light are adjusted by a Fabry-Perot interferometer , Make it produce the beat frequency signal of the fixed frequency, utilize the nature that this beat frequency changes with the frequency variation to carry on the Doppler frequency shift measurement.The theoretical analysis proves this method has very high measuring precision, The difficulty is not large, taking into account the advantages of ordinary coherent and non-coherent detection methods. In addition, the correctness and feasibility of the method is proved by experiments and compared with the common non-coherent method, the method can be improved by about one order of magnitude .