Ogiwara H
Appl Opt. 1979 May 15;18(10):1533-8. doi: 10.1364/AO.18.001533.
A laser Doppler velocimeter is analyzed based on a Fourier optical model. A relation between power spectral density of output signal and structure of optical elements is derived. Based on the relation, a low-frequency disturbance, which appears in an ordinary LDV output, is shown to be canceled by using a differential detector. The output signal becomes a pure narrowband signal whose center frequency is proportional to the object velocity. A velocity measurement experiment result shows the usefulness of the differential detector method.
基于傅里叶光学模型对激光多普勒测速仪进行了分析。推导了输出信号的功率谱密度与光学元件结构之间的关系。基于该关系，结果表明，通过使用差分探测器，可以消除普通激光多普勒测速仪输出中出现的低频干扰。输出信号变为中心频率与物体速度成正比的纯窄带信号。速度测量实验结果表明了差分探测器方法的有效性。
