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随着激光技术的发展,国外有人曾设想把这种高相干性的光源用于测量材料的速度。其原理就是采用众所周知的多普勒效应来测量当移动物体使光散射时而产生的小频率漂移。Yeh 和 Cummins 于1964年制作了第一个风速计,并用它来测量管路中的流量。1966年,美国航空及宇宙航行局的 Foreman 及他的同事们制成了第一个真正的实用仪器。从那以后,曾有许多研究者对激光风速计进行了研究,并取得了一些成果。这种仪器已从纯科学珍品发展到可与诸如热线风速计等其它风速计相竞争的仪器了。本文主要介绍已经设计的几种激光风速计
With the development of laser technology, some people abroad have envisaged using this highly coherent light source for measuring the speed of materials. The principle is to use the well-known Doppler effect to measure the small frequency drift that occurs when moving objects scatter light. Yeh and Cummins produced the first anemometer in 1964 and used it to measure the flow in the pipeline. In 1966, NASA’s Foreman and his colleagues made the first real, practical instrument. Since then, many researchers have studied the laser anemometer and made some achievements. Such instruments have evolved from pure science treasures to instruments that can compete with other anemometers such as hot wire anemometers. This article describes several laser anemometers that have been designed