Accuracy improvement of unflat object size measurements in laser scanning systems

Victor V. Tarasov; Yuri G. Yakushenkov

doi:10.1117/12.498328

8 July 2003 Accuracy improvement of unflat object size measurements in laser scanning systems

Proceedings Volume 5036, Photonics, Devices, and Systems II; (2003) https://doi.org/10.1117/12.498328
Event: Photonics, Devices, and Systems II, 2002, Prague, Czech Republic

Abstract

In laser scanning devices using a projection method of measurement a narrow laser beam moves parallel to itself. If the velocity of scanning of the plane of the object under control is constant then the duration of the video signal which is formed behind the object will correspond to the object’s size lengthwise the direction of scanning. If the object is not flat the duration of the video signal will not correspond to the size of the object due to the fact that in the process of its formation there takes part the beam reflected from the surface of the object under measuring. Thus the error appears in the result of measurement. The error which depends on the object’s configuration and reflectivity may be rather significant. The formula of calculation of the error as a function of the object’s surface curvature and height of microroughness of the surface is presented in the work. There is suggested the way of compensation of the error which consists of covering synchronously to the movement of the scanning beam and by turns the halves of the sensitive areas of the bielement photodetector located symmetrically to the optical axis.

Citation Download Citation

Victor V. Tarasov and Yuri G. Yakushenkov "Accuracy improvement of unflat object size measurements in laser scanning systems", Proc. SPIE 5036, Photonics, Devices, and Systems II, (8 July 2003); https://doi.org/10.1117/12.498328

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