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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.
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Pedro D. V. Buschinelli, João Ricardo C. Melo, Armando Albertazzi Jr., João M. C. Santos, Claudio S. Camerini, "Optical profilometer using laser based conical triangulation for inspection of inner geometry of corroded pipes in cylindrical coordinates," Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87881H (13 May 2013); https://doi.org/10.1117/12.2020966