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Mode and time delay estimation for non-destructive evaluation systems

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3 Author(s)
Pearson, J. ; University of Strathclyde, Glasgow, U.K. ; Macleod, C.J. ; Durrani, T.S.

This paper describes the development of a multi-path and multimode propagation model for NDE. The mode content of a multipath is estimated using Maximum Likelihood (ML) estimation based on a receiving array delay vector. The model analysis allows a defect to be located by employing both the mode estimates and a ML estimation of the shear and longitudinal propagation angles. Some aspects of the attendant processing hardware are also discussed.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '82.  (Volume:7 )

Date of Conference:

May 1982