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Proceedings Paper

Tactile-optical 3D sensor applying image processing
Author(s): Ulrich Neuschaefer-Rube; Mark Wissmann
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Paper Abstract

The tactile-optical probe (so-called fiber probe) is a well-known probe in micro-coordinate metrology. It consists of an optical fiber with a probing element at its end. This probing element is adjusted in the imaging plane of the optical system of an optical coordinate measuring machine (CMM). It can be illuminated through the fiber by a LED. The position of the probe is directly detected by image processing algorithms available in every modern optical CMM and not by deflections at the fixation of the probing shaft. Therefore, the probing shaft can be very thin and flexible. This facilitates the measurement with very small probing forces and the realization of very small probing elements (diameter: down to 10 μm). A limitation of this method is that at present the probe does not have full 3D measurement capability. At the Physikalisch-Technische Bundesanstalt (PTB), several arrangements and measurement principles for a full 3D tactile-optical probe have been implemented and tested successfully in cooperation with Werth-Messtechnik, Giessen, Germany. This contribution provides an overview of the results of these activities.

Paper Details

Date Published: 19 January 2009
PDF: 9 pages
Proc. SPIE 7239, Three-Dimensional Imaging Metrology, 72390H (19 January 2009); doi: 10.1117/12.810464
Show Author Affiliations
Ulrich Neuschaefer-Rube, Physikalisch-Technische Bundesanstalt (Germany)
Mark Wissmann, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 7239:
Three-Dimensional Imaging Metrology
J. Angelo Beraldin; Geraldine S. Cheok; Michael McCarthy; Ulrich Neuschaefer-Rube, Editor(s)

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