Abstract

The use of laser speckle for displacement and deformation measurement has found wide applications in mechanics and metrology. Traditionally, a deterministic approach has been adopted to analyze the process. In this paper a statistical approach is utilized, resulting in a better understanding of the limitations and potentials of one-beam subjective laser-speckle interferometry (or speckle photography). We find that the amplitude modulation of the information-carrying cosine fringes is controlled by three factors: a decorrelation factor γ, a displacement factor Ω, and a displacement-gradient factor ψ. We introduce the concept of an ambiguity factor that sets a critical value for the product γΩψ. We then propose a criterion for fringe discernibility from which the upper limit of measurement is established.

© 1985 Optical Society of America

Decorrelation functions in laser speckle photography

D. W. Li and F. P. Chiang
J. Opt. Soc. Am. A 3(7) 1023-1031 (1986)

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

Strain analysis by one-beam laser speckle interferometry. 2: Multiaperture method

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Statistical analysis of whole-field filtering of specklegram and its upper limit of measurement

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Speckle photography with different pupils in a multiple-exposure scheme

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