| Summary: | 碩士 === 國立中央大學 === 照明與顯示科技研究所 === 101 === This paper applies laser structure light to measure 3D lens surface curvature , The aim is to develop a cheaper as well as quick measurement of the non-contact measurement method, using program to monitor the shape changes of the laser rays on the lens surface . Take advantage of optical measurement, the system is non-destructive, non-contact, quick and easy to set up. Compared with the shade law of the measurement, laser light can do the long distances measurement, which intensity is more strength and the constraints of the distance and the space is relatively small.
Optical Triangular Laser detection system of lens includes a special acrylic-made platform, a one dollar coin, red structure laser light, a CMOS image sensors, two lenses and PC. The resolution of CMOS image sensor is 640*480 pixel sizes and per second 30 frame. CMOS image sensor captures video information into MATLAB for analysis, converts the video into image frames, makes image binarization, laser triangulation method, optical centroid, and then we analyze the pixel as the principles. Therefore we can know the initial distribution of the laser line on the lens surface. And through the optical triangulation principle and the correction of resolution, we can get the real position and the real size of the lens from the horizontal direction view. Finally, matlab fit the curve we get above and calculate the radius of curvature as well as do 3D lens surface plots, and complete the lens measurement.
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