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Proceedings Paper

Optimized interferometer for 3D digital holographic endoscopy
Author(s): Wolfgang Osten; Ervin Kolenovic; Reiner Klattenhoff; N. Koepp
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Paper Abstract

Digital holography provides the direct access to the interference phase. This basic quantity of interferometry can be used for the measurement of 3D-coordinates and 3D-displacement fields of objects subjected to a certain kind of load. For the inspection of objects which cannot be accessed directly such as hidden surfaces inside a cavity endoscopic systems are applied. In this paper a miniaturized sensor is described that can be fixed at the distal end of a flexible endoscope. The sensor head integrates all components of a holographic interferometer including the CCD-camera as well as the beam splitting and guiding components for three illumination directions using glass fibers. An optimized design of the interferometer setup makes it possible to measure the 3D components of the measurement quantity with high accuracy. After a short introduction to the principles of digital holography and 3d-displacement measurement the basics of perturbation theory are presented. This theory is applied for the design of the interferometer and finally some consequences with respect to the statistical error analysis are discussed.

Paper Details

Date Published: 30 May 2003
PDF: 12 pages
Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); doi: 10.1117/12.508357
Show Author Affiliations
Wolfgang Osten, Univ. Stuttgart (Germany)
Ervin Kolenovic, Bremer Institut fur Angewandte Strahltechnik (Germany)
Reiner Klattenhoff, Bremer Institut fur Angewandte Strahltechnik (Germany)
N. Koepp, VEW GmbH (Germany)

Published in SPIE Proceedings Vol. 5144:
Optical Measurement Systems for Industrial Inspection III
Wolfgang Osten; Malgorzata Kujawinska; Katherine Creath, Editor(s)

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