DISTRIBUTED CIRCLE METHOD FOR GUIDED WAVE BASED CORROSION DETECTION IN PLATE-LIKE STRUCTURES

• Main Authors: ROSE Curtis Wayne, FALSETTI Robert Vincent, NIRI Ehsan Dehghan
• Format: Patent
• Language: English
• Published: 06.07.2017
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

A system and methods for defect detection and characterization in plate-like structures, more particularly to detect corrosion in complex plate-like structures that result in a deviation in thickness in at least a patch of the structure. The system comprises a plurality of transducers configured to be adjacent to at least a portion of a plate-like structure. A controller is coupled to the plurality of transducers. The method includes propagation of guided waves through the plate-like structure and capture of data to detect the presence of at least one defect using at least a pair of transmitting/receiving transducers based on a change in the velocity of wave transmission as compared to the velocity predicted for a pristine structure. The method also includes estimated localization, and estimation in size and change in thickness of one or more patches using at least four discrete wave transmission paths that traverse the defect by using optimization of a proposed error function to estimate based on distributed circles using a derivative free optimization based algorithm.