Computer-Controlled Laser Beams In Object Dimension Measurements

J. Johansson; C. O. Falt; S. T. Eng

doi:10.1117/12.7972390

1 August 1979 Computer-Controlled Laser Beams In Object Dimension Measurements

J. Johansson, C. O. Falt, S. T. Eng

Author Affiliations +

Optical Engineering, Vol. 18, Issue 4, 184384 (August 1979). https://doi.org/10.1117/12.7972390

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 ex-perimental 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.

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J. Johansson, C. O. Falt, and S. T. Eng "Computer-Controlled Laser Beams In Object Dimension Measurements," Optical Engineering 18(4), 184384 (1 August 1979). https://doi.org/10.1117/12.7972390

Published: 1 August 1979

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