First, grating is projected on measured free surface, and height data of each point on free surface is measured by the grating projection method.
首先将矩形光栅投影在被测表面上，利用光栅投影法测量自由曲面上每点高度信息。
Differing from the traditional optical measuring method, the measuring system USES two CCD cameras to record projection grating, thus reduces errors and improves measuring accuracy.
与传统的光学测量方法不同，测量系统采用两个CCD相机记录投影光栅，减小了测量误差，提高了测量精度。
Projection grating measuring technique, which records the measurement results with binocular CCD camera, is a new optical measuring method.
利用双目CCD相机记录的光栅投影测量技术是一种新型的光学测量方法。
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