STATISTICAL ANALYSIS OF SPECKLE FIELDS IN DIGITAL LASER 
MONITORING OF THE MICROSTRUCTURE OF PAPER

V. V. Azharonok,a N. B. Bazylev,b
E. I. Lavinskaya,bI. I. Filatova,a 
and N. A. Fominb 

UDC 535.311+536.24

It has been shown that digital dynamic speckle photography 
is an effective method for quantitative diagnostics of changes in 
the structure of paper processed by pulsed discharge. A theory of 
the dynamic statistics of speckle fields and mathematical relations 
are given. In using optical magnification  M = 1, the software 
developed permits fast statistical processing of up to 
250,000 microzones in a two-dimensional CCD image of size 20 × 30 mm. 
The results obtained point to a high spatial and temporal resolution 
of the method and the possibility of its real-time realization.
It has been shown that noise filtering is an important part 
of speckle image processing. The software permits filtering both 
in direct calculation of the correlation function and in the Fourier 
plane with the use of the fast Fourier transform.

aInstitute of Molecular and Atomic Physics, 
National Academy of Sciences of Belarus, 70 Nezalezhnost' 
Ave., Minsk, 220072; bA. V. Luikov Heat 
and Mass Transfer Institute, National Academy of Sciences of Belarus, 
15 P. Brovka Str., Minsk, 220072, Belarus. Translated from Inzhenerno- 
Fizicheskii Zhurnal, Vol. 80, No. 4, pp. 127-137, July-August, 
2007. Original article submitted August 26, 2006.