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Absorption filter correction by spectral shifts of ultrasonic propagation in nonlinearattenuating media

Published online by Cambridge University Press:  25 October 2002

M. G. S. Ali ,
N. Z. El-Sayed ,
N. A. Kamel  and
A. Raouf Mohamed
M. G. S. Ali*
Affiliation:
Physics Department, Faculty of Science, Minia University, Egypt
N. Z. El-Sayed
Affiliation:
Physics Department, Faculty of Science, Minia University, Egypt
N. A. Kamel
Affiliation:
Physics Department, Faculty of Science, Minia University, Egypt
A. Raouf Mohamed
Affiliation:
Physics Department, Faculty of Science, Minia University, Egypt
*
mrrami2001@hotmail.com
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Abstract

A closed form solution of the general case of frequency shift of a Gaussian pulse in a nonlinear power law attenuating medium of arbitrary exponent including the effect of transient radiation coupling process is presented. Also, this paper describes a simulation of the spectrum pathway in an ultrasonic A-scan. It includes transducer response, frequency dependent absorption in the test medium and radiation coupling transfer function. The measurement and simulation result has been used with the closed form solution to correct the absorption filter (attenuation coefficient). The attenuation coefficient correction for castor oil to fit the simulation result with recorded data is examined.

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References

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