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Proceedings Paper

Optical profilometer using laser based conical triangulation for inspection of inner geometry of corroded pipes in cylindrical coordinates
Author(s): Pedro D. V. Buschinelli; João Ricardo C. Melo; Armando Albertazzi; João M. C. Santos; Claudio S. Camerini
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Paper Abstract

An axis-symmetrical optical laser triangulation system was developed by the authors to measure the inner geometry of long pipes used in the oil industry. It has a special optical configuration able to acquire shape information of the inner geometry of a section of a pipe from a single image frame. A collimated laser beam is pointed to the tip of a 45° conical mirror. The laser light is reflected in such a way that a radial light sheet is formed and intercepts the inner geometry and forms a bright laser line on a section of the inspected pipe. A camera acquires the image of the laser line through a wide angle lens. An odometer-based triggering system is used to shot the camera to acquire a set of equally spaced images at high speed while the device is moved along the pipe’s axis. Image processing is done in real-time (between images acquisitions) thanks to the use of parallel computing technology. The measured geometry is analyzed to identify corrosion damages. The measured geometry and results are graphically presented using virtual reality techniques and devices as 3D glasses and head-mounted displays. The paper describes the measurement principles, calibration strategies, laboratory evaluation of the developed device, as well as, a practical example of a corroded pipe used in an industrial gas production plant.

Paper Details

Date Published: 13 May 2013
PDF: 10 pages
Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87881H (13 May 2013); doi: 10.1117/12.2020966
Show Author Affiliations
Pedro D. V. Buschinelli, Univ. Federal de Santa Catarina (Brazil)
João Ricardo C. Melo, Univ. Federal de Santa Catarina (Brazil)
Armando Albertazzi, Univ. Federal de Santa Catarina (Brazil)
João M. C. Santos, Cidade Univ. (Brazil)
Claudio S. Camerini, Cidade Univ. (Brazil)


Published in SPIE Proceedings Vol. 8788:
Optical Measurement Systems for Industrial Inspection VIII
Peter H. Lehmann; Wolfgang Osten; Armando Albertazzi, Editor(s)

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