QUANTITATIVE VISUALIZATION OF ULTRASONIC
ACOUSTIC WAVES BY MEANS OF DIGITAL LASER
SPECKLE-TECHNOLOGIES

C. A. Greated,a J. A. Cosgrove,b
and N. A. Fominc

UDC 535.241.13:534

An original version of digital laser speckle photography 
has been used for visualization and quantitative diagnosis of acoustic 
waves in liquids in the megahertz frequency range. Standing acoustic 
waves were generated in tanks of special configuration which permitted 
obtaining analytical dependences of refraction angles of the probe 
laser radiation on the wave intensity. These refraction angles were 
determined experimentally by the change in contrast of the speckle 
fields arising in the scattered probe radiation and recorded by means 
of high-resolution digital CCD matrices. Quantitative diagnosis of 
the pressure and velocity fields in acoustic waves was carried out 
by measuring the deformation of the laser intensity correlation functions 
in recorded speckle fields.

aUniversity of Edinburgh, Edinburgh, Scotland, UK; 
bProfessional Scientific Limited, Edinburgh 
Technology Transfer Centre BioSpace, Edinburgh, Scotland, UK; 
cA. V. Luikov Heat and Mass Transfer Institute, 
National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 
220072; email: fomin@hmti.ac.by. Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 81, No. 2, pp. 229-239, March-April, 2008. Original 
article submitted November 25, 2007.