Abstract
An ultrasonic, nondestructive inspection system for the early detection of corrosion in fuel tank aluminum liners was developed and tested. A Labview‐controlled scanner, which rode on the tank’s resident rib braces, housed a 10‐MHz transducer and a miniature video camera. The bi‐directional (axial, azimuthal) scan resolution was controlled by adjusting the surface standoff distance of the focused transducer to produce variable‐area interrogation sites. The phenomenon of increased backscatter from corrosion‐roughened surfaces was exploited to detect the presence of corrosion in its early stages. The transducer acted as both transmitter and receiver, capturing the echoes from the subject surface while the video camera captured an image of the surface under acoustic inspection. The acoustic and visual data were overlayed to form a composite image of the entire inspection surface. The system was field‐tested using two tanks pulled from active duty at the Marine Corps maintenance facility in Cherry Point, NC. [Work supported by JCAA.]
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