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TECHNICAL BRIEFS

Topographical Evaluation of Subsea Defects in Offshore Structures Using a Shadow Moiré Technique

[+] Author and Article Information
P. M. MacKenzie, C. A. Walker

Department of Mechanical Engineering, University of Strathclyde, Glasgow G1 1XJ, Scotland

J. Offshore Mech. Arct. Eng 116(2), 114-116 (May 01, 1994) (3 pages) doi:10.1115/1.2920131 History: Received March 02, 1993; Revised December 14, 1993; Online June 12, 2008

Abstract

Optical techniques based on the moiré phenomenon are powerful tools with applications over a range of engineering inspection/measurement problems. A study of the application of the shadow moiré method in connection with detailed examination of replicas taken from damaged subsea zones of offshore structures has been performed. Measurements of the surface profiles of areas altered by processes such as corrosion pitting, and remedial grinding of cracks, were obtained using the technique. This method offers a convenient “real-time” approach to visualizing height contours.

Copyright © 1994 by The American Society of Mechanical Engineers
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