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Optical Engineering

Calibration of a laser range-finding coordinate-measuring machine
Author(s): David W. Manthey; Keith N. Knapp; Daeyong Lee
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Paper Abstract

An automated, self-calibrating, active-laser-triangulation 3-D surface-measuring system has been designed and built for the acquisition of surface coordinate information. The system is driven by a 50-MHz 80486-based PC/AT computer controlling a laser, a CCD camera, a frame-grabber card, and an encoded motor-driven positioning system. A novel self-calibration procedure is executed in a matter of seconds with the use of a standard sphere and a flat plane. Data acquisition rates of 750 points/s are obtained with an overall system accuracy of ± 0.12 mm using a 75-mm compound lens. Resolutions for the system, using the 75-mm lens, are 480 parts per image width of field in the x axis, 0.6 im in the y axis, and 4096 parts per depth of field in the z axis. The system operates at a standoff of 30 cm, a depth of view of 7 cm, and a width of field of view of 4.5 cm in the close plane and 6 cm in the far plane. The theory and design of the system are presented along with the derivation and implementation of the calibration equations, followed by results of the system's application, and a brief discussion on ways of improving accuracy, resolution, and data acquisition rates.

Paper Details

Date Published: 1 October 1994
PDF: 9 pages
Opt. Eng. 33(10) doi: 10.1117/12.179409
Published in: Optical Engineering Volume 33, Issue 10
Show Author Affiliations
David W. Manthey, CamSys, Inc. (United States)
Keith N. Knapp, Rensselaer Polytechnic Institute (United States)
Daeyong Lee, Rensselaer Polytechnic Institute (United States)


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