Abstract
Abstract We have witnessed a spurt in the Nondestructive Evaluation (NDE) activities during the recent past. The significant growth in NDE is fuelled by the challenges namely characterisation and testing of new materials, stringent testing and evaluation requirements and demands for the application of NDE to life prediction and intelligent processing of materials. Computer, robotic and sensor technologies coupled with advances in modelling towards understanding of physical interactions of testing medium with material and component, are the prime resources which have helped NDE professionals to meet these challenges. Signal analysis and imaging are the two technologically relevant areas which need to be harnessed extensively for meeting the present and future challenges with confidence on a cost-effective basis. This paper presents a perspective on the significance of signal processing in acoustic methods to solve difficult engineering problems. Specific success stories where signal processing and analysis concepts have enabled the solution or added to the reliability and enhanced sensitivity levels are briefly described. Fertile areas for research and development in signal processing as applied to acoustic NDE methods are identified and highlighted.
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