光學三角量測系統量測透鏡曲率與3D曲面之研究; Optical triangular measurement system for the study of measuring the surface curvature of the lens.

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题名:	光學三角量測系統量測透鏡曲率與3D曲面之研究;Optical triangular measurement system for the study of measuring the surface curvature of the lens.
作者:	林冠宇;Lin,Kuan-yu
贡献者:	照明與顯示科技研究所
关键词:	影像二值化;雷射三角測量法;光學質心法;CMOS影像感測器
日期:	2013-07-19
上传时间:	2013-08-22 12:08:32 (UTC+8)
出版者:	國立中央大學
摘要:	本研究將一條及多條雷射線應用於透鏡表面曲率及3D表面曲面之量測，目的是在開發一種更便宜快速簡易的非接觸式量測方法，並以程式來監測透鏡表面的變化和形狀。利用光學量測的優勢，所以本系統有非破壞性、非接觸性、儀器架設快速方便等優點。跟陰影量測法相比起來，雷射光可以打的距離更遠，強度更夠，距離上的限制也比較小，所以此系統受到場地的侷限度也會比較小。光學式透鏡檢測系統包含一特殊壓克力自製平台、一壹圓硬幣、多紅光雷射、一CMOS影像感測器、兩片待測鏡片以及個人電腦。其中CMOS影像感測器解析度為640480，每秒30 frame。CMOS影像感測器將拍攝的影片資訊匯入電腦內再以MATLAB 做分析，接著把影片轉成影像，做影像二值化、雷射三角測量法、光學質心法，我們以分析像素作為基本原則，可以得知初步透鏡曲面上的雷射線分佈位置，再經由三角量測原理定參考點量位移以及一元硬幣校正解析度，獲得真正從水平方向平視所測得的雷射線位置及真實大小，再用 matlab fitting 曲線從而計算出曲率半徑及繪出3D表面，而完成待測物的表面觀測。 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 640480 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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