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Proceedings Paper

Computer-Controlled Laser Beams In Object Dimension Measurements
Author(s): J. Johansson; C. O. Falt; S. T. Eng
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Paper Abstract

This paper describes some general features of a computer-controlled laser system for noncontact measurements of dimensions of objects. The laser beams are scanned over the object and a system of detectors mounted behind the object detects whether the beams are shadowed by the object or not. The detector signals are converted to digital values and transferred to a minicomputer, where they are processed. This may require special software to allow the dimensional data to be presented in real time. An experimental system with a HeNe laser and controlled by an HP 21MX minicomputer has been built and tested. At a rate of 100 measurements per second the systematic error is in the order of 1 mm for absolute measurements and 0.1 mm for relative measurements. The imprecision is about 0.1 mm for both cases.

Paper Details

Date Published: 25 July 1979
PDF: 5 pages
Proc. SPIE 0164, 4th European Electro-Optics Conf, (25 July 1979);
Show Author Affiliations
J. Johansson, Chalmers University of Technology (Sweden)
C. O. Falt, Chalmers University of Technology (Sweden)
S. T. Eng, Chalmers University of Technology (Sweden)

Published in SPIE Proceedings Vol. 0164:
4th European Electro-Optics Conf

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