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Proceedings Paper

Position Sensitive Detection Techniques for Manufacturing Accuracy Control
Author(s): Anssi J. Makynen; Juha T. Kostamovaara; Risto A. Myllyla
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Paper Abstract

A sensor system is proposed which can be used to detect a stationary reflective point on a target object. It includes a servo-controlled measuring head and small optical reflectors attached to the target points of the object. The measuring head consists of the target point detector, rangefinder and angle encoders. Target detection is accomplished by illuminating the cooperative marks of the target with an infra-red emitting diode (WED) and focusing the reflected light on the surface of the position sensor. The latter acts as a null detector and its signals are used to drive the servomotors of the measuring head. The proposed sensor is used in a 3D-vision system designed for checking the manufacturing accuracy of large objects in engineering shops. Preliminary results for the target point detection electronics show that a lateral tracking resolution of about 0.003 mm (la-value) and an accuracy of about +1- 0.5 mm are achievable when the distance and angle of the target point reflector vary in the ranges 2 - 5 m and +/- 45•, respectively.

Paper Details

Date Published: 1 April 1990
PDF: 10 pages
Proc. SPIE 1194, Optics, Illumination, and Image Sensing for Machine Vision IV, (1 April 1990); doi: 10.1117/12.969857
Show Author Affiliations
Anssi J. Makynen, University of Oulu (Finland)
Juha T. Kostamovaara, University of Oulu (Finland)
Risto A. Myllyla, Techn. Res. Centre of Finland (Finland)


Published in SPIE Proceedings Vol. 1194:
Optics, Illumination, and Image Sensing for Machine Vision IV
Donald J. Svetkoff, Editor(s)

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