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Comparison of Methods for Determining the Contrast Distribution in Interference Images with Speckle Noise

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Pyziak L., Matczak M., Zięba P.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
173-175
EN
Information about certain physical states of an examined object is encoded in the distribution of the fringe contrast in the metrological interference images of the object. Determining the contrast is one of the steps of converting the image into the distribution of the measured quantity in holographic fringe-contrast interferometry. In this paper, three methods of determining the fringe contrast in interference images containing speckle noise are compared. As the criterion for comparing the methods, the mean absolute error has been used. It turns out, in accordance with this criterium, the most effective method is the phase-shifting one.
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Focusing of an electromagnetic plane wave into a uniaxial crystal by a Wood lens

100%
Ghaffar A., Naqvi Q.
Open Physics
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2009
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vol. 7
|
issue 1
41-49
EN
High frequency fields, refracted by a geometry containing a Wood lens placed at a certain distance from a planar uniaxial interface, are derived by using Maslov’s method. The geometrical optics approximation generally valid for high frequency fields fails in the vicinity of a caustic. Maslov’s method is a systematic procedure for predicting the field in the caustic region, combining the simplicity of the ray and the generality of the transform method. Numerical computations are made for the field pattern around the caustic by using Maslov’s method. The results are found to be in good agreement with those obtained using Kirchhoff’s approximation.
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