ANOMALOUS REFLECTION OF A LONGITUDINAL
ULTRASONIC WAVE FROM A STRONGLY DISSIPATIVE MEDIUM

D. A. Kostyuka and Yu. A. Kuzavkob 


UDC 534.838.4

Normal reflection of a longitudinal acoustic wave from 
the plane interface between a solid acoustic line and a strongly dissipative 
medium (an epoxide resin compound in the process of solidification) 
has been experimentally investigated. A 14-fold change in the reflection 
coefficient of pulsed signals and a decrease in their duration have 
been detected and the point of phase transmission has been reliably 
determined by the minimum of the reflection coefficient. The coefficient 
of reflection of continuous acoustic waves with frequencies of 1<196>10 
MHz from the interface between a plexiglas (or aluminum) and an epoxide 
resin compound in the process of solidification has been measured. 
The influence of the amplitude-frequency characteristic of an ultrasonic 
piezoelectric transducer on the measurement data obtained has been 
analyzed. The change in the viscosity coefficient of an epoxide resin 
compound in the process of its solidification has been calculated 
by the spectral transform method with the use of computer programs 
and experimental data on the reflection coefficient dynamics.

a Brest State Technical University, 
41-1 Levanevskii Str., Brest, 224005, Belarus; email: d.k@softhome.net; 
b Institute of Radio Engineering and Electronics, 
Russian Academy of Sciences, Moscow, Russia; email: kuzavko@newmail.ru. 
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 77, No. 5, pp. 
151-159, September-October, 2004. Original article submitted 
December 10, 2003.