Calibration method of parallel projection beams for 3D profile measurement

Shuo-Jen Lee; TienJung Fan

doi:10.1117/12.253008

3 October 1996 Calibration method of parallel projection beams for 3D profile measurement

Shuo-Jen Lee, TienJung Fan

Proceedings Volume 2899, Automated Optical Inspection for Industry; (1996) https://doi.org/10.1117/12.253008
Event: Photonics China '96, 1996, Beijing, China

Abstract

3D profile measurement of work-piece by non-contact optical methods has been studied extensively because of its importance in the automated manufacturing processes and quality control of components. In this paper, a projection method and its calibration algorithm of parallel projection means for 3D profile measurement system was presented. The proposed method used the pin-hole theory. An arc light which was assumed to be a point light source was positioned in the focal point of a parabolic mirror. After it was reflected by the parabolic mirror, uniform parallel light beams were projected. Using alignment collimator and telescope, the best positions of all of the optical elements in the system can be adjusted. Parameters of CCD lens, image center, arc light source and their relative positional relationship were also calibrated. This ensures the overall accuracy of the projection system. For most of the structured light optical methods, the size and shape of the dot laser beam or the length and width of a line laser beam of the projected slits were functions of the measurement range. A lot of efforts and caution have been conducted int he calibration process and mathematical manipulations are required to assure the measurement accuracy. The proposed parallel projection beam method eliminates above mentioned difficulty. It could be a robust and efficient non-contact optical method for the measurement of 3D profile.

Citation Download Citation

Shuo-Jen Lee and TienJung Fan "Calibration method of parallel projection beams for 3D profile measurement", Proc. SPIE 2899, Automated Optical Inspection for Industry, (3 October 1996); https://doi.org/10.1117/12.253008

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KEYWORDS

Calibration

Mirrors

Light sources

3D metrology

Charge-coupled devices

Projection systems

Telescopes

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