Sriram P, Hanagud S, Craig J, Komerath N M
Appl Opt. 1990 Jun 1;29(16):2409-17. doi: 10.1364/AO.29.002409.
A scanning laser Doppler technique based on Chebyshev demodulation has been developed for the rapid measurement of spatially distributed velocity profiles. Scan frequencies up to 100 Hz can be used over scan lengths up to 270 mm. The Doppler signals are processed in the conventional manner using a frequency counter. The analog velocity output from the counter is post-processed to obtain the velocity profile. The Chebyshev demodulation post-processing technique for processing the velocity signals from solid surfaces has been introduced. The data processing technique directly yields the spatial velocity distribution in approximate functional form through frequency domain analysis of the scanning LDV velocity output. Results from a rotating disk setup are presented to illustrate the concept.
一种基于切比雪夫解调的扫描激光多普勒技术已被开发出来，用于快速测量空间分布的速度剖面。扫描频率高达100Hz，可用于长达270mm的扫描长度。多普勒信号使用频率计数器以传统方式进行处理。计数器输出的模拟速度经过后处理以获得速度剖面。介绍了用于处理来自固体表面速度信号的切比雪夫解调后处理技术。该数据处理技术通过对扫描激光多普勒测速输出进行频域分析，直接以近似函数形式得出空间速度分布。给出了旋转圆盘装置的结果以说明该概念。
