Impact of multireflections on measurement accuracy in the endoscopic 3D reconstruction of gearing geometries

Lennart Hinz; Markus Kästner; Eduard Reithmeier

doi:10.1117/12.2592599

20 June 2021 Impact of multireflections on measurement accuracy in the endoscopic 3D reconstruction of gearing geometries

Lennart Hinz, Markus Kästner, Eduard Reithmeier

Author Affiliations +

Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII; 117821D (2021) https://doi.org/10.1117/12.2592599
Event: SPIE Optical Metrology, 2021, Online Only

Abstract

Optical triangulation systems based on fringe projection profilometry have emerged in recent years as a complement to traditional tactile devices. Due to the good scalability of the measurement approach, a highly compact novel sensor for maintenance and inspection in narrow spaces is realized by applying optical fiber bundles. Especially in the field of high-resolution and rapid maintenance in industrial environments, numerous applications arise. Endoscopic 3D measurements of gearing geometries are of particular technical relevance for detecting and quantifying damage. The measurement performance depends to a considerable extent on the technical surface to be inspected. Polished surfaces are particularly problematic due to specular reflections, but can still be partially reconstructed by using HDR imaging. However, if multiple reflections occur due to the specimen geometry and sensor arrangement in such a way that the optical path of each corresponding camera pixel can no longer be reconstructed unambiguously, a measurement is no longer feasible. In this study, the effects of surface roughness, sensor arrangement, and triangulation angle on measurement error are systematically investigated to describe possible application limits and provide guidance on sensor operation.

Conference Presentation

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Lennart Hinz, Markus Kästner, and Eduard Reithmeier "Impact of multireflections on measurement accuracy in the endoscopic 3D reconstruction of gearing geometries", Proc. SPIE 11782, Optical Measurement Systems for Industrial Inspection XII, 117821D (20 June 2021); https://doi.org/10.1117/12.2592599

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