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本文首先描述了激光多普勒测速原理,而后论述了两束光的相干匹配。前者指出激光多普勒测速原理的理论解释始于多普勒效应和光外差技术,而后对于双光束条纹型光路又用散射粒子穿越相交区的干涉条纹而产生信号频率进行了解释。两种解释都有不足之处,于是本文提出了一种统一的理论即激光多普勒测速原理是基于光的多普勒效应和光的干涉,而两者紧密配合则能达到测速的目的,因此本文作者认为正确的名字应为激光多普勒干涉测速仪。并从光的多普勒效应、测速中光的多普勒效应、测速中光的干涉几部分进行了论述。后者着重论述了两束光的
This paper first describes the principle of laser Doppler velocimetry, and then discusses the coherent matching of two beams. The former points out that the theoretical explanation of the principle of laser Doppler velocimetry begins with the Doppler effect and the optical heterodyne technique, and then explains the frequency of the signal generated by the interference fringes of the scattering particles passing through the intersecting region of the double-beam striped optical path. Both explanations have some shortcomings. Therefore, this paper presents a unified theory that the principle of laser Doppler velocimetry is based on Doppler effect of light and light interference, and the two can cooperate closely to achieve velocity measurement. Therefore, The authors believe the correct name should be a laser Doppler interferometer. The Doppler effect of light, the Doppler effect of light in speed measurement and the light interference in speed measurement are discussed. The latter focuses on the two beams of light