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Reduction of phase singularities in speckle-shearing interferometry by incoherent averaging of speckle patterns

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Mantel,  K.
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Nercissian,  Vanusch
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Lindlein,  N.
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Mantel, K., Nercissian, V., & Lindlein, N. (2015). Reduction of phase singularities in speckle-shearing interferometry by incoherent averaging of speckle patterns. In OPTICAL MEASUREMENT SYSTEMS FOR INDUSTRIAL INSPECTION IX. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA: SPIE-INT SOC OPTICAL ENGINEERING. doi:10.1117/12.2184580.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6450-F
Abstract
Speckle interferometry is a well established technique for the optical characterization of rough objects, with the quantification of deformations as one particular application of interest. Owing to its common path property, a speckle-shearing interferometer is often the natural choice as a setup. Like other speckle techniques, however, speckle-shearing interferometry suffers from the existence of phase singularities present in the speckle patterns. Phase singularities introduce ambiguities into the phase unwrapping process and make this evaluation step highly sophisticated. In this work, we attempt to reduce the number of phase singularities by physical means, i. e. by applying an incoherent averaging of multiple, mutually independent speckle intensities. The effect of the incoherent averaging on the number of phase singularities has been investigated theoretically, by computer simulations, and experimentally To obtain high contrast fringes in connection with a shearing setup, which would not be the case for a simple extended light source, a periodically structured light source with a period matched to the shear distance is applied. It turns out that the number of phase singularities may indeed be reduced, but only to a certain extent.