3D optical endoscopy is now a major challenge to allow the high resolution inspection of industrial equipments. The proposed instrument is based on a flexible image guide (70 000 fibres) and a Digital Micro mirror Device (DMD, 1024 × 768 “on-off” micro mirrors). The optical design is as follows: the light emitted by a 532 nm laser diode is dynamically structured by the DMD chip as a fringes pattern which is phase-shifted due to the active control of the DMD chip and projected onto an object on a circular field of 6 mm in diameter. Due to a telecentric and binocular arrangement that creates a stereoscopic angle, it is possible to get a depth of field of 2 mm along the optical axis without keystone distortions and few disturbances created by defocus and coma aberrations. Then, images are captured by a 1024 × 768 digital camera (not yet moved away by fibres) at 15 fps and directly used in the reconstruction algorithm to access the tri-dimensional shape of the unpainted object. The results are compared to incoherent white light results obtained with white painted mechanical objects. The lateral resolution is 31.3 μm and the RMS axial resolution is 10 μm for the laser-based design after speckle attenuation.
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ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis
July 2–4, 2012
Nantes, France
Conference Sponsors:
- International
ISBN:
978-0-7918-4487-8
PROCEEDINGS PAPER
Tri-Dimensional Optical Inspection Based on Flexible Image Guide: First Step Toward 3D Industrial Endoscopy
Erwan Dupont,
Erwan Dupont
Université de Technologie de Compiègne, Compiègne, France
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Frédéric Lamarque,
Frédéric Lamarque
Université de Technologie de Compiègne, Compiègne, France
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Christine Prelle,
Christine Prelle
Université de Technologie de Compiègne, Compiègne, France
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Tanneguy Redarce
Tanneguy Redarce
Institut National des Sciences Appliquées, Lyon, France
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Erwan Dupont
Université de Technologie de Compiègne, Compiègne, France
Frédéric Lamarque
Université de Technologie de Compiègne, Compiègne, France
Christine Prelle
Université de Technologie de Compiègne, Compiègne, France
Tanneguy Redarce
Institut National des Sciences Appliquées, Lyon, France
Paper No:
ESDA2012-82453, pp. 477-483; 7 pages
Published Online:
August 12, 2013
Citation
Dupont, E, Lamarque, F, Prelle, C, & Redarce, T. "Tri-Dimensional Optical Inspection Based on Flexible Image Guide: First Step Toward 3D Industrial Endoscopy." Proceedings of the ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. Volume 4: Advanced Manufacturing Processes; Biomedical Engineering; Multiscale Mechanics of Biological Tissues; Sciences, Engineering and Education; Multiphysics; Emerging Technologies for Inspection and Reverse Engineering; Advanced Materials and Tribology. Nantes, France. July 2–4, 2012. pp. 477-483. ASME. https://doi.org/10.1115/ESDA2012-82453
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