Abstract

Dual-plate speckle photography provides a technique for canceling rigid body displacements of an object by recording the images that correspond to the two deformation states on separate photographic plates. When both plates are positioned with a glass base between the emulsions and illuminated by a laser beam, a pattern of circular fringes is formed. Speckle displacement can be determined by measuring the distance between the fringe pattern center and the undiffracted laser beam. The performance of an algorithm for automatic analysis of these fringes is evaluated by using computer-generated fringe patterns. Accuracy is determined for different values of speckle displacements and fringe visibilities.

© 1992 Optical Society of America

Automatic digital processing in speckle photography: comparison of two algorithms

Hugo D. Navone and Guillermo H. Kaufmann
Appl. Opt. 28(2) 350-353 (1989)

Hybrid optical and electronic image processing for strain measurements by speckle photography

B. Ineichen, P. Eglin, and R. Dändliker
Appl. Opt. 19(13) 2191-2195 (1980)

Range and accuracy of speckle displacement measurement in double-exposure speckle photography

Jin Seung Kim
J. Opt. Soc. Am. A 6(5) 675-681 (1989)

Heterodyne readout system for dual plate speckle photography: analysis of error sources and performance evaluation

Jin Seung Kim, Sergio Musazzi, Umberto Perini, and Marzio Giglio
Appl. Opt. 28(10) 1862-1868 (1989)

Numerical processing of speckle photography data by Fourier transform

G. H. Kaufmann
Appl. Opt. 20(24) 4277-4280 (1981)