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Borescopic 3D inspection of complex geometries

Autor: Jochen Schlobohm

ISBN: 978-3-95900-206-6

Dissertation, Leibniz Universität Hannover, 2018

Herausgeber der Reihe: Eduard Reithmeier

Band-Nr.: imr 02/2018

Umfang: 120 Seiten, 51 Abbildungen

Schlagworte: fringe projection, geometric measurements, endoscopy, Streifenprojektion, 3D Messung, Endoskopie


This work gives an overview of borescopic 3D inspection. It focuses on the use of fringe projection profilometry with a borescope for image projection and a chip-on-tip camera for image acquisition. It starts with a short history of endoscopes and covers the state of the art of 3D optical measurement and endoscopic inspection systems. The main part addresses the development of a rigid borescopic fringe projection system. The high distortion of a borescope and its flexible shaft yield new challenges towards the calibration of such a measurement system. Major contributions where made towards the analysis and compensation of aberrations caused by bending of the rigid borescope. Hence a method for orientation sensitive calibration was introduced. Additionally, the topic of calibrating a serial kinematic, used to position the measurement system relative to a specimen, is covered. Finally, this work concludes with measurement results and an outlook for further research.

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