Journal ArticleDOI
Phénomènes de Diffraction à Trois Dimensions
Alain Lifchitz,Marie May +1 more
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In this paper, a plaque photographique haute resolution is described, where a faisceau parallele de lumiere monochromatique is placed at the derriere de diffuseur.Abstract:
Un diffuseur d'amplitude est eclaire par un faisceau parallele de lumiere monochromatique. Une plaque photographique haute resolution est placee derriere de diffuseur. On fait N poses entre lesquelles le diffuseur est deplace parallelement a l'axe optique du faisceau d'une quantite k. La plaque photographique est developpee et eclairee par un faisceau de lumiere parallele. On observe a l'infini un systeme d'anneaux a ondes multiples (N ondes).read more
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Journal ArticleDOI
New Method of Optical Processing Using a Random Diffuser
TL;DR: In this article, the authors describe a new method of optical processing which is one of the principal topics of study in our laboratory, which consists of the detection of the difference between two images, the multiplexing of images, contrast reversal of the reconstructed images in carrier frequency photography, the coding and decoding of a message and the reconstruction of colour images from black and white recordings.
Journal ArticleDOI
Young's fringes at infinity in diffused light with dark central fringe
TL;DR: In this paper, the production of interference fringes at infinity in diffused light is described, and the fringe system has a dark fringe at its centre, which is the same as the one described in this paper.
Journal ArticleDOI
Multiple-exposure speckle photography of the out-of-plane motion : comparative performance of filtering by collimated and converging beams
Arvind Kumar,K. Singh +1 more
TL;DR: In this article, a theoretical and experimental analysis is carried out, showing the effect of multiple exposures in speckle photography of the out-of-plane motion, and the intensity distribution at the Fresnel plane is investigated in the case of filtering by a converging beam for double exposure and multiple exposures.
Journal ArticleDOI
Speckle photography of out-of-plane motion: effect of multiple-exposures in free space geometry of recording
Arvind Kumar,Kehar Singh +1 more
TL;DR: In this article, a theoretical and experimental analysis is carried out of the fringe formation in speckle photography of the out-of-plane motion of a diffuse object, and a multiple exposure technique has been used to sharpen the fringes.
Journal ArticleDOI
Measurement of three-dimensional rigid body motion by multiple exposure speckle photography: use of uncollimated beam illumination in free space geometry
Anil Kumar,Kehar Singh +1 more
TL;DR: In this article, the effect of multiple exposures on fringes in the case of three-dimensional motion of a diffuse object illuminated by a diverging beam from a laser point source is analyzed.