Calibration of an Impact Device and Its Application to the Normalized Spectral Analysis of Impact-Echo Tests

Abstract:

The objective of this paper is to introduce an impact device made by embedding a piezoelectric sensor into a steel sphere and to develop a calibration method for measuring the impact force. The force-time function of impact can be used to normalize the spectrum obtained from an impact-echo test. Furthermore, an approach was proposed to make the normalized spectrum dimensionless. A new technique based on the dimensionless normalized spectrum is developed to quantitatively evaluate the difference in acoustic impedance at the interface between two dissimilar materials. The impact-echo test results show that the dimensionless normalized spectrum is capable of identifying the degree of the difference in acoustic impedance at the interface between two dissimilar materials.

• Periodical: Key Engineering Materials (Volumes 321-323)
• Pages: 381-385
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.321-323.381
• Online since: October 2006
• Authors: Yi Ching Lin, Chun Kuei Yang, Chia Chi Cheng
• Keywords: Acoustic Impedance, Calibration, Impact Device, Impact-Echo, Layered Structure, Normalized Spectrum, Piezoelectric Sensors

References

[1] M. Sansalone and N.J. Carino: Concrete Int. Vol. 10(4) (1998), p.38.

[2] M.J. Sansalone and W.B. Streett, Impact-Echo�Nondestructive evaluation of concrete and masonry, Bullbrier Press, Ithaca, (1997).

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