利用光學投射條紋重建實體輪廓

本論文發展一個非接觸式之光學量測系統，擷取投射於待測物上的正弦光柵圖案，藉此測量物體3D輪廓。首先利用電腦程式產生正弦強度分佈的光學條紋圖案，以LCD投影機將其投射於待測物表面。接著以CCD相機擷取四張投射光學條紋影像，此四張影像在一個週期中的相位移角間距各為90度。最後使用相位移技術獲得變形光學條紋的相位分佈，再利用分支切割法計算得到連續的相位分佈，物體3D輪廓便可經由連續的相位分佈轉換而求得。本文使用所發展的方法以測試重建各種待測物之3D輪廓，由所量測的重建結果，可證明本文所發展的非接觸式光學量測系統是有效率且正確的。

關鍵字

分支切割法；相位移技術；正弦光柵

並列摘要

This thesis develops a non-contact optical measurement system for measuring 3D object profiles from images of projected sinusoidal grating patterns. First, the fringe pattern with sinusoidal intensity is generated by a computer program and projected onto the object surface by a LCD projector. Four images of the projected fringe patterns with phase shift at 90-degree interval for a cycle are taken from the CCD camera. Phase-shifting technique is used to find the phase distribution of the distorted fringe pattern, and the branch cut algorithm is applied to compute the continuous phase distribution. The 3D profiles of the object can be obtained from the continuous phase distribution. 3D profiles of several test objects are reconstructed, and from the measured results, it shows that the developed non-contact optical measurement system can be used efficiently and accurately.

並列關鍵字

sinusoidal grating ； phase-shifting technique ； branch cut algorithm

參考文獻

[23] 林威志，覆晶凸點線上三維形貌量測儀研製，中原大學機械工程研究所碩士論文，2003.

[3] 張家壽，應用數位投影疊紋法於微小尺寸表面之量測，國立台灣大學應用力學研究所碩士論文，2001.

[4] G. Bickel, G. Hausler and M. Maul, “Triangulation with expended range of depth,” Optical Engineering, Vol.24, pp.975-977, 1985.

[5] J.J. Li, Y. Zhao and D.H. Li, “A new type of common path heterodyne profilometer with annular lens,” Proc. ISMTII’96, pp.419-421, 1996.

[6] C. Hinojosa, S.H. Alfonso and J.G. Ibarra, “Recovery of three-dimensional shapes by using defocused structured light,” Optics and Laser Technology, Vol.30, pp.281-290, 1998.

國際替代計量

利用光學投射條紋重建實體輪廓

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