Abstract
In this paper, we present an elongated speckle images produced from diffusers using sharp elliptical apertures. The orientation of the elliptic aperture is recognized from the direction of the elongation in the speckle images. The aperture tilting out of the plane is investigated. Three models of elliptical apertures are considered and the corresponding speckle images are obtained. The 1st model is composed of two orthogonal ellipses or plus symbol pupil; the 2nd has four symmetric ellipses with an angle of 45° between each of them or in the form of a snow flake pupil and the 3rd model looks like an airplane. Also, the autocorrelation profiles of the speckle images corresponding to the diffused airplane are obtained from which the average speckle size is computed. Finally, the reconstructed images of the described elliptical models and its autocorrelation images, making use of Mat lab code, are obtained.
Highlights
The production of elongated speckle images was obtained using the mechanical scanning of the static speckle pattern [1]
We present an elongated speckle images produced from diffusers using sharp elliptical apertures
The laser speckle pattern, arising from light scattered from rough surfaces that are illuminated by polychromatic laser light, is detected in the far-field region
Summary
The production of elongated speckle images was obtained using the mechanical scanning of the static speckle pattern [1]. It is noted that the sharp ellipses considered in this study have a semi-major axis ten times larger than the semi-minor axis as compared with the recent work [3] with the semimajor axis nearly equal to the semi-minor axis These new models allow the recognition of the different elliptic models from the speckle images as compared with the circular aperture. With laser uniform illumination incident upon the object (the diffuser) followed by the simulated sharp elliptic aperture. In this case, we can write the complex amplitude transmittance as follows:. The direction of speckle is elongated normal to the semi-major axis of the elliptic aperture
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