应用相位移法的二维光栅测量

本文介绍了二种二维位移测量的光栅方法。测试系统采用CCD摄象系统记录正交光栅图象,通过调整摄象机变焦镜头的放大倍数来控制采样的空间频率。采样后用数字信号处理的方法,通过软件手段实现水平向和垂直向光栅信号的分离,然后运用了相位移技术及载波—相位移技术得到二维位移。所开发的测试系统除具有高精度、高灵敏度的特点外,还具有较高的空间分辨率。

TWO DIMENSIONAL GRID MEASUREMENT WITH PHASE-SHIFTING METHOD

In this paper, two-dimensional displacement measurement technique with two grid methods are presented. The image of a crossed network bonded onto a body under examination is acquired with a CCD camera. The zoom magnification of the camera is chosen to control sample frequency. Horizontal and vertical grid line information is separated with two digital signal processing method. Then, a phase-shiffing method and a special carrier phase-shifting method are used to determine the two components of the displacement. Primary experiment results have already been obtained which show that this system have a good sensitivity of measurement and a high resolution.