Abstract
A diffusely reflecting surface illuminated by coherent (laser) light appears grainy when viewed by eye or by a camera. These so called laser speckles form a pattern which behaves as being attached to the surface. They follow any surface displacement. This property is the basis for the measurement of in-plane displacement fields by speckle photography1. By recording two images of the surface, one before and one after a deformation, two speckle patterns will be recorded. The displacement of a point on the surface is obtained from the displacement of the corresponding speckles in the two speckle images. A similar approach is to cover the surface to be studied with a synthetic pattern and use white light for illumination. The analysis of the two techniques are identical. In this paper three experiments using a newly developed electronic speckle photography system are presented.
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A. E. Ennos, “Speckle Interferometry,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. ( Springer-Verlag, Berlin, 1975 ), pp. 203–253.
J. W. Goodman, “Statistical Properties of Laser Speckle Patterns,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. ( Springer-Verlag, Berlin, 1975 ), pp. 9–75.
M. Sjödahl and L. R. Benckert, “Systematic and random errors in electronic speckle photography,” submitted to Applied Optics, (April 1993).
M. Sjödahl and L. R. Benckert, “Electronic speckle photography: Analysis of an algorithm giving the displacement with subpixel accuracy,” accepted for publication in Applied Optics, (December 1992).
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© 1994 Springer-Verlag Berlin Heidelberg
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Sjödahl, M. (1994). Electronic Speckle Photography: Some Applications. In: Waidelich, W. (eds) Laser in der Technik / Laser in Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08251-5_37
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DOI: https://doi.org/10.1007/978-3-662-08251-5_37
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-57444-6
Online ISBN: 978-3-662-08251-5
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