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Automatic estimation of ultrasonic attenuation for porosity evaluation in composite materials

L.-K. Shark and C. Yu
Department of Engineering and Product Design
University of Central Lancashire
Preston, PR1 2HE, UK
J. P. Smith
BAE SYSTEMS
Warton, Preston, PR4 1AX, UK
Contact

Abstract

1. Introduction

2. Signal Restoration

3. Attenuation Estimation

4. Experimental Results

5. Conclusions

Acknowledgement

References

  1. McRae, K.I. and Zala, C.A.:"Attenuation and porosity estimation using the frequency-independent parameter Q", Review of Progress in Quantitative Nondestructive Evaluation, Vol.14, pp703-710, 1995.
  2. Daniel, I.M., Wooh, S.C. and Komsky, I.:"Quantitative porosity characterization of composite materials by means of ultrasonic attenuation measurements ", Journal of Nondestructive Evaluation, No.11, pp1-8, 1992.
  3. Strange,G., and Nguyen, T. Wavelets and Filter Banks, Wellesley-Cambridge Press, 1996.
  4. Shark, L.-K. and Yu, C.:" Denoising by optimal fuzzy thresholding in wavelet domain ", IEE Electron. Lett., Vol.36, pp581-582, 2000.
  5. Donoho, D.L. and Johnstone, I.M.:"Adapting to unknown smoothness by wavelet shrinkage ", J. Am. Statist. Ass., Vol.90, No.432, pp1200-1224, 1995.
  6. Donoho,D.L.:" De-noising by soft-thresholding ", IEEE Trans. Info. Theory, Vol.41, No.3, p613-627, 1995.

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