Homomorphic Processing in Ultrasonic NDE
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Modern signal processing techniques used in computing flaw impulse response are based on comparative analysis of a reference signal with the signal scattered from flaws. The underlying hypothesis in these techniques is that, in the noise free case, the scattered flaw signal is due to the linear convolution of the ultrasonic reference signal with the flaw impulse response. The flaw characterization problem thus reduces to determining the kernel of the convolution integral given the input and output time signals. The impulse response recovery (system identification) has been carried out both in the frequency and time domains for flaw characterization.