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On the Uncertainty of Time-Frequency Domain Resolutions for Ultrasonic Velocity Evaluation of Surface Elastic Waves

Edouard G. Nesvijski, Tatiana E. Nesvijski
Center of Technology, Federal University of Santa Maria, Santa Maria, RS, Brazil
e-mail: edouard@w3.ufsm.br
URL: http://ww.ufsm.br/edouard/
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INTRODUCTION

PROBLEMS OF VELOCITY ESTIMATION IN CONSTRUCTION MATERIALS

ULTRASONIC PULSE PROPAGATION IN MATERIALS WITH HIGH VELOCITY DISPERSION

SURFACE WAVES APPLICATION PROBLEMS

DISCRIMINATION OF TIME OF PULSE PROPAGATION

TIME-FREQUENCY CONVOLUTION

CONCLUSIONS

REFERENCES

  1. Popovics, S. Strength and Related Properties of Concrete. Quantitative Approach, John Wiley and Sons, New York, etc. 1998
  2. Nesvijski, E.G. New Possibilities of Application of Ultrasonics for Investigation of Developing Cracks in Materials - Perspective Testing Technologies. Proceedings: CNDT 30th Anniversary Conference. NDT Tools of Tomorrow, Niagara Falls, Ontario, Canada, May 16-18, 1995
  3. Nesvijski, E.G. On Optimal Design of Ultrasonic Measuring Instruments for Estimation of Strength and Elastic Properties of Composite Materials. Proceedings: Tenth International Conference on Composite Materials (ICCM-10), Whistler, Canada, August 13-18, 1995, pp. 469-477..
  4. Working Group Report on Nondestructive Evaluation of Concrete Structures and Materials. Third Conference on Nondestructive Evaluation of Civil Structures and Materials, Boulder, CO, USA, September 9-11, 1996, Working Group Reports, pp. 1-5.
  5. Shah S.P., Subramaniam, K.V., and Popovics, J.S. Use of Nondestructive Techniques for Material Assessment and In-Service Monitoring of Concrete Structures. Proceedings: International Symposium on Nondestructive Testing Contribution to the Infrastructure Safety Systems in the 21st Century (NDTISS'99), Torres, RS, Brazil, November 22-26, 1999, pp. 107-114.
  6. Vijay K. Madisetti, Douglas B. Williams. The Digital Signal Processing Handbook, A CRC Press & IEEE Press, 1998.

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