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B6 - Endoscopic Geometry Inspection

Endoscopic Geometry Inspection by Modular Fibre-optic Sensors

Project Status: finished

Last Update: 20.10.2020


The aim of subproject B6 "Endoscopic Geometry Inspection" which is part of the collaborative research centre (Transregio) 73 is to develop a measuring system based on the principle of fringe projection in combination with flexible optical fibres. The usage of optical fibres allows a spatial separation of the measuring head and the camera-projector unit. Therefore, a measuring head of small dimensions can perform measurements in forming plants. The main task of subproject B6 is the design of the optical setup, the construction of appropriate measuring heads within in the context of the measuring task and the development of algorithms processing the fringe pattern by including the transmission properties of the used optics.



Working Groups



    • Hinz, L.; Kästner, M.; Reithmeier, E.: Impact of multireflections on measurement accuracy in the endoscopic 3D reconstruction of gearing geometries. In: SPIE Optical Metrology, (2021), Bellingham, WA, USA: SPIE, accepted
    • Hinz, L.; Kästner, M.; Reithmeier, E.: Improved defect segmentation by combining a fiber optic fringe projection system with a directionally variable front brightfield illumination. In: SPIE Photonics West, Emerging Digital Micromirror Device Based Systems and Applications XIII, (2021), Bellingham, WA, USA: SPIE, published
    • Hinz, L.; Metzner, S.; Müller, P.; Schulte, R.; Besserer, H.; Wackenrohr, S.; Sauer, C.; Kästner, M.; Hausotte, T.; Hübner, S.; Nürnberger, F.; Schleich, B.; Behrens, B.; Wartzack, S.; Merklein, M.; Reithmeier, E.: Fringe Projection Profilometry in Production Metrology: A Multi-Scale Comparison in Sheet-Bulk Metal Forming. In: Steve Vanlanduit (Edt.): 21(2021)7, Basel, Suisse: MDPI Sensors, published
    • Hinz, L.; Kästner, M.; Reithmeier, E.: Adaptive camera calibration for a focus adjustable liquid lens in fiber optic endoscopy. In: SPIE Optics+Optoelectronics: Nonlinear Optics and Applications XII, (2021), Bellingham, WA, USA: SPIE, published


    • Hinz, L.; Kästner, M.; Reithmeier, E.: High-Resolution Inspection of Tools for Novel Forming Processes by an Endoscopic Fringe Projection System. In: OSA Imaging and Applied Optics Congress, (2020), accepted
    • Hinz, L.; Kästner, M.; Reithmeier, E.: A 3D Measuring Endoscope for use in Sheet-Bulk Metal Forming: Design, Algorithms, Applications and Results. In: Lecture Notes in Production Engineering - Sheet-Bulk Metal Forming, (2020), Springer Nature Switzerland AG, accepted
    • Hinz, L.; Kästner, M.; Reithmeier, E.: Adaptive merging of large datasets of a 3D measuring endoscope in an industrial environment. In: Proceedings of SPIE, 11352(2020)113520, SPIE Photonics Europe, published
    • Hinz, L.; Schulte, R.; Kästner, M.; Reithmeier, E.: Werkzeuginspektion in der Blechmassiv-umformung durch die faseroptische Streifenprojektionsmesstechnik. In: Behrens, B.-A. (Edt.): Aktuelle Entwicklungen im Bereich der Umformtechnik; 23. Umformtechnisches Kolloquium Hannover, (2020), Garbsen: TEWISS, published


    • Hinz, L.; Schulte, R.; Pilz, F.; Kästner, M.; Reithmeier, E.: Quantifizierung der Werkzeugkondition bei der Blechmassivumformung durch faseroptische Streifenprojektion. In: M. Merklein, B.-A. Behrens, A. E. Tekkaya (Edt.): 4. Workshop Blechmassivumformung, (2019), FAU University Press, pp. 69-87
    • Hinz, L.; Kästner, M.; Reithmeier, E.: Metal Forming Tool Monitoring Based on a 3D Measuring Endoscope Using CAD Assisted Registration. In: Sensors, 19(2019)9, Basel: MDPI, published


    • Matthias, S.; Kästner, M.; Reithmeier, E.: A 3D measuring endoscope for hand-guided operation. In: Measurement Science and Technology, 29(2018)9, IOP Publishing, published
    • Matthias, S.: A flexible endoscopic structured light 3-D sensor: Design, models and image processing. In: Dissertation, (2018), Garbsen: PZH-Verlag, published


    • Matthias, S.; Kästner, M.; Reithmeier, E.: Fiber-optic fringe projection with crosstalk reduction by adaptive pattern masking. In: Proceedings of SPIE, 10117(2017), SPIE Photonics West, pp. 101170A
    • Matthias, S.; Kästner, M.; Reithmeier, E.: Pattern sequences for fast absolute phase retrieval with application in the handheld operation of structured light sensors. In: Ilmenau Scientific Colloquium (Edt.): Engineering for a Changing World: Proceedings, 59(2017), Ilmenau, published