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Short-Time Fourier Transform of Continuous Wave Doppler Signals

Published online by Cambridge University Press:  10 February 2011

Shi-Chang Wooh ,
Coach Wei  and
Arthur Clay
Shi-Chang Wooh
Affiliation:
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, scwooh@mit.edu
Coach Wei
Affiliation:
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, scwooh@mit.edu
Arthur Clay
Affiliation:
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, scwooh@mit.edu
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Abstract

A Doppler-based ultrasonic monitoring scheme was introduced to detect discontinuities on the surface of a rapidly moving object. Single-tone, continuous wave (CW) ultrasound was impinged onto the moving surface and the reflected signal was processed by a Short-Time Fourier Transform (STFT) algorithm to identify surface anomalies. By monitoring the peak magnitude of the STFT spectra within a specified window, it was possible to reconstruct a signal representing Doppler frequency shift continuously in the time domain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 503: Symposium JJ – Nondestructive Characterization of Materials in Aging Systems , 1997 , 269
Copyright
Copyright © Materials Research Society 1998

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References

1. Grewal, D. S., Mat. Eval., 983–986, Sept. (1996).Google Scholar
2. Tuzik, B., Railway Track and Structures, 27, 21–22, July (1995).Google Scholar
3. Wooh, S. C., Keynote Lecture, International Workshop for Application of NDT Technology for Failure Prevention, KSNT and RIMT, Pusan, Korea, Oct. 18–20 (1995).Google Scholar
4. Wooh, S. C. and Clay, A., in Review of Progress in Quantitative Nondestructive Evaluation, edited by Thompson, D. O. and Chimenti, D. E., Plenum Press, New York, N. Y., (1998).Google Scholar
5. Oppenheim, A. V. and Schafer, R. W., Discrete-Time Signal Processing, Prentice Hall, Englewood Cliffs, NJ, (1989).Google Scholar