NEW SCHEMES OF DIGITAL SPECKLE PHOTOGRAPHY

This paper presents a review and an analysis of the development of speckle photography from the fi rst experiments performed at the National Physical Laboratory of Great Britain up to the present time. The possibility of diagnosing turbulent and three-dimensional fl ows by the speckle photography methods has been shown. The single-exposure scheme of speckle photography has been analyzed and the possibility of using multiaspect speckle photography in reconstructive tomography of complex three-dimensional fl ows has been shown. Methods based on speckle technologies such as Talbot interferometry, PIV and BOS techniques have been analyzed. Particular consideration is given to the application of new measuring technologies in diagnosing turbulent fl ows and reconstructive tomography of three-dimensional fl ows.
   
Author:  O. G. Penyazkov and N. A. Fomin
Keywords:  digital speckle photography, speckle technologies, speckle fi eld, cross-correlation analysis, PIV, BOS, Talbot interferometry
Page:  941