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Ultrasonic attenuation measurement using backscattering technique

 
: Goebbels, K.; Willems, H.

Thompson, D.O.:
Review of Progress in Quantitative Nondestructive Evaluation. Vol.8B : Second half of the proceedings of the 15. Annual Review of Progress in Quantitative Nondestructive Evaluation, held July 31 - August 5, 1988, in La Jolla, California
New York/N.Y.: Plenum Press, 1989
ISBN: 0-306-43209-9
S.1747-1753
Annual Review of Progress in Quantitative Nondestructive Evaluation <15, 1989, La Jolla/Calif.>
Englisch
Konferenzbeitrag
Fraunhofer IZFP ()
backscattering; grain size; multiple scattering; steel; ultrasonic attenuation; ultrasound

Abstract
Ultrasonic backscattering measurements by means of spatial averaging technique were carried out in steel to determine the ultrasonic attenuation coefficient. The attenuation coefficients were evaluated from the exponential decay of the backscattering signal. The results were compared with those obtained by evaluating the amplitude decay of the main pulse. Good agreement is observed provided the condition is valid, i.e. Rayleigh scattering with d/lambda equal or smaller than 0.2 and or weak elastic anisotropy of the single crystal. Otherwise multiple scattering becomes dominant and the amplitude decay of the backscattering curve is no longer related to the attenuation coefficient.

: http://publica.fraunhofer.de/dokumente/PX-37415.html