TY - GEN

T1 - Impact of multireflections on measurement accuracy in the endoscopic 3D reconstruction of gearing geometries

AU - Hinz, Lennart

AU - Kästner, Markus

AU - Reithmeier, Eduard

N1 - Funding Information: The authors would like to thank the German Research Foundation (DFG) for funding the project B6 ”Endoscopic geometry inspection” within the Collaborative Research Center (CRC) / TR 73.

PY - 2021/6/20

Y1 - 2021/6/20

N2 - 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. The endoscopic three dimensional reconstuction of gearing geometries is of particular technical relevance for detecting and quantifying damage or wear. 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 multireflections occur 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 and texture, sensor arrangement, and triangulation angle on measurement error are systematically assessed to identify potential application limits and provide guidance for sensor operation.

AB - 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. The endoscopic three dimensional reconstuction of gearing geometries is of particular technical relevance for detecting and quantifying damage or wear. 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 multireflections occur 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 and texture, sensor arrangement, and triangulation angle on measurement error are systematically assessed to identify potential application limits and provide guidance for sensor operation.

KW - Endoscopy

KW - Fringe projection

KW - Gear inspections

KW - Multireflection

KW - Production metrology

KW - Specular reflection

UR - http://www.scopus.com/inward/record.url?scp=85109419099&partnerID=8YFLogxK

U2 - 10.1117/12.2592599

DO - 10.1117/12.2592599

M3 - Conference contribution

AN - SCOPUS:85109419099

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Optical Measurement Systems for Industrial Inspection XII

A2 - Lehmann, Peter

A2 - Osten, Wolfgang

A2 - Goncalves, Armando Albertazzi

PB - SPIE

T2 - Optical Measurement Systems for Industrial Inspection XII 2021

Y2 - 21 June 2021 through 25 June 2021

ER -