Optimized interferometer for 3D digital holographic endoscopy

Wolfgang Osten; Ervin Kolenovic; Reiner Klattenhoff; N. Koepp

doi:10.1117/12.508357

30 May 2003 Optimized interferometer for 3D digital holographic endoscopy

Wolfgang Osten, Ervin Kolenovic, Reiner Klattenhoff, N. Koepp

Proceedings Volume 5144, Optical Measurement Systems for Industrial Inspection III; (2003) https://doi.org/10.1117/12.508357
Event: Optical Metrology, 2003, Munich, Germany

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.

Citation Download Citation

Wolfgang Osten, Ervin Kolenovic, Reiner Klattenhoff, and N. Koepp "Optimized interferometer for 3D digital holographic endoscopy", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); https://doi.org/10.1117/12.508357

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