Absorption filter correction by spectral shifts of ultrasonic propagation in nonlinear attenuating media
Physics Department, Faculty of Science, Minia University, Egypt
Corresponding author: email@example.com
Accepted: 23 August 2002
Published online: 25 October 2002
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.
PACS: 43.40.Le – Techniques for nondestructive evaluation and monitoring, acoustic emission
© EDP Sciences, 2002