Sasaki O, Abe T, Shimizu T, Niwayama M
Appl Opt. 1980 Jan 15;19(2):289-92. doi: 10.1364/AO.19.000289.
A new laser Doppler velocimeter (LDV) where the waveform of Doppler signal changes according to the direction of the velocity vector is proposed. This feature makes it possible to measure selectively a specified velocity vector. A practical LDV system is constructed to be applied to the measurement of the falling velocity of raindrops. In this system the selection of a specified velocity vector is carried out by the detection of a difference between the two periods separated by one cycle of Doppler frequency in a Doppler burst. The experimental results show clearly the usefulness of this system.
提出了一种新型激光多普勒测速仪（LDV），其多普勒信号波形会根据速度矢量方向发生变化。这一特性使得选择性测量指定速度矢量成为可能。构建了一个实际的LDV系统，用于测量雨滴的下落速度。在该系统中，通过检测多普勒脉冲串中相隔一个多普勒频率周期的两个周期之间的差异来选择指定的速度矢量。实验结果清楚地表明了该系统的实用性。
