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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 21 — Jul. 20, 2008
  • pp: 3868–3876

Photogrammetric endoscope for measurement of inner cylindrical surfaces using fringe projection

Armando G. Albertazzi, Jr., Allan C. Hofmann, Analucia V. Fantin, and João M. C. Santos  »View Author Affiliations

Applied Optics, Vol. 47, Issue 21, pp. 3868-3876 (2008)

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We present a photogrammetric endoscope to measure three dimensional (3D) shapes of inner cylindrical surfaces by fringe projection. The basic configuration includes two identical cameras aligned with the optical axis and facing each other, conical lenses, and a 360 ° helical fringe projector. The helical fringe pattern is phase shifted and acquired by both cameras. The phase patterns are used to acquire data from the surface in a regular cylindrical mesh. A prototype was built, calibrated, and tested. We present the results and an application to inspect internal welding seams and misalignment of welded joints in 150 mm ( 6 in . ) diameter pipelines.

© 2008 Optical Society of America

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(150.6910) Machine vision : Three-dimensional sensing
(150.3045) Machine vision : Industrial optical metrology

ToC Category:
Machine Vision

Original Manuscript: March 24, 2008
Revised Manuscript: June 21, 2008
Manuscript Accepted: June 24, 2008
Published: July 16, 2008

Armando G. Albertazzi, Jr., Allan C. Hofmann, Analucia V. Fantin, and João M. C. Santos, "Photogrammetric endoscope for measurement of inner cylindrical surfaces using fringe projection," Appl. Opt. 47, 3868-3876 (2008)

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