应用单色光的三维激光测速系统

A 3-D LASER DOPPLER VELOCIMETRY SYSTEM WITH THE SINGLE COLOR LASER

摘要

摘要:本文发展了一种采用单色激光器的三维激光测速系统。四束入射光布置成等腰直角三角形,用一个前透镜聚焦。这种光学布置光能利用率高,并能适用于近壁处流速测量。当实验模型具有多层不同性质介面时,入射光仍能保持相交。为了分离三维速度分量,采用了频率分离和偏振分离技术。特别考虑了光轴分量的测量精度,提出了提高测量精度的一些方法。应用此系统测量了斜切尾钝体后部的三维平均速度和湍流度分布。

Abstract:A 3-D LDV system for measuring three velocity components by using a He-Ne laser has been presented. Four incident beams were arranged to be an isosceles triangle with a right angle and focused by a single front lens. Such a beam arrangement has been examined as a most efficient form of the light energy utilization. It is also well suited to measure the velocity profiles close to a wall even in the situations in existing two different layers which the incident beams have to penetrate through, In order to sep...