Abstract
Computerized tomography (CT) algorithms have been used mainly in the medical field buttheir powerful capabilities are being exploited more and more in industrial applications.This paper demonstrates that the technology is capable of detecting materialloss on real aircraft components using embedded piezoelectric sensors on hiddensurfaces. The work is novel in more than one respect. Firstly, it demonstratesthat Lamb wave ultrasonic tomography can be used to accurately map materialloss on an exposed aircraft surface with sensors embedded on the structure’shidden surface. Hidden, in this case, refers to the surface that is not exposed to theatmosphere—the underneath of an aircraft wing, for example. Secondly, it comparestomographic images generated by fan-beam back projection and the signal differencecoefficient methods, showing clearly that the latter are more sensitive to material loss.
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