Processing laser range image for the investigation on the long-term performance of ductile iron pipe

This paper describes the development of a procedure that uses laser scanning to assess external pitting corrosion of ductile iron pipe. The statistical model for the procedure was established by identifying and characterizing corroded areas from scanned laser range images. Pipe investigation is done by using a scanner equipped with a laser displacement sensor that generates an accurate topographic mapping of the outer surface of the pipe. The scanning speed can be increased by reducing the resolution and using interpolation later to increase the resolution. The paper compares the accuracy of several interpolation methods.Dans ce document, on d\ue9crit l'\ue9laboration d'une marche \ue0 suivre pour l'\ue9valuation de la corrosion par piq\ufbres sur l'ext\ue9rieur des tuyaux en fonte ductile, au moyen du balayage par faisceau laser. On a \ue9tabli le mod\ue8le statistique \ue0 employer aux fins de cette m\ue9thode en identifiant et en caract\ue9risant les zones corrod\ue9es \ue0 partir d'images de t\ue9l\ue9m\ue9trie de balayage laser. L'investigation des tuyaux est r\ue9alis\ue9e au moyen d'un scanner muni d'un capteur de d\ue9placement laser, qui g\ue9n\ue8re un mappage topographique pr\ue9cis de la surface externe des tuyaux. On peut accro\ueetre la cadence de balayage peut \ueatre augment\ue9e en diminuant la r\ue9solution et en utilisant ult\ue9rieurement l'interpolation pour augmenter celle-ci. On y compare la pr\ue9cision de plusieurs m\ue9thodes d'interpolation diff\ue9rentes.Peer reviewed: YesNRC publication: Ye