空间调制激光束测量超低速度

应用科学学报 ›› 1991, Vol. 9 ›› Issue (4): 290-296.

空间调制激光束测量超低速度

孙卫真, 郭继华, 殷纯永

清华大学

收稿日期:1990-04-28 修回日期:1990-09-01 出版日期:1991-12-31 发布日期:1991-12-31

EXTREMELY LOW VELOCITY MEASUREMENT BY MEANS OF SPACIAL MODULATED LASER BEAM

SUN WEZHEN, GUO JIHUA, YIN CHUNYONG

Tsinghua University

Received:1990-04-28 Revised:1990-09-01 Online:1991-12-31 Published:1991-12-31

摘要/Abstract

摘要： 介绍了一种测量超低速度的激光多普勒测速仪.测量体中条纹的空间位置受到调制得到三组顺序出现的相位差分别为0°,90°,180°的条纹.经过信号处理可方便地去掉近频干扰噪声该仪器可以测量0.3mm/s到0.02μm/s的速度,精度优于2%,文中给出了一个电烙铁在加热过程中伸长量的变化的实测结果.

关键词: 激光多普勒测速, 超低速度测量

Abstract: In this paper a new laser Doppler velocimeter for extremely low velocity is introduced. The spacial light modulation and time dividing technique are used to clean-up low frequency noise which is close to the measurand. The principle of the method, optical diagram, and signal processing system are described. The measuring range is (300μm/s-0.02μm/s), and the accuracy is higher than 2%. An experimental result of a heating soldering iron Is given.

Key words: low velocity measurement, Laser Doppler anemometer

孙卫真, 郭继华, 殷纯永. 空间调制激光束测量超低速度[J]. 应用科学学报, 1991, 9(4): 290-296.

SUN WEZHEN, GUO JIHUA, YIN CHUNYONG. EXTREMELY LOW VELOCITY MEASUREMENT BY MEANS OF SPACIAL MODULATED LASER BEAM[J]. Journal of Applied Sciences, 1991, 9(4): 290-296.