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Optical Engineering

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 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.

Paper Details

Date Published: 1 August 1979
PDF: 3 pages
Opt. Eng. 18(4) 184384 doi: 10.1117/12.7972390
Published in: Optical Engineering Volume 18, Issue 4
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)

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