How knowledge about speckle intensity and phase gradients can improve electronic speckle pattern interferometry

Heinz Helmers; Jan Burke

doi:10.1117/12.355083

19 July 1999 How knowledge about speckle intensity and phase gradients can improve electronic speckle pattern interferometry

Heinz Helmers, Jan Burke

Author Affiliations +

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.355083
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

Abstract

As is well known, the spatial coherence in a speckle field is limited to an area called the mean speckle size. Throughout this area, the coherence decays smoothly from the center to the margin of a speckle, and the degree of coherence between two points (x₁,y₁) and (x₂,y₂) determines the probable amount of deviations between their intensities I₁, I₂ and phases. These deviations are of special importance when spatial phase shifting is applied in electronic speckle pattern interferometry. We demonstrate that the knowledge about the intensity and phase gradients in the object speckle pattern can be used to reduce the noise in measured deformation maps significantly.

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Heinz Helmers and Jan Burke "How knowledge about speckle intensity and phase gradients can improve electronic speckle pattern interferometry", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.355083

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