Download PDF by Jayant Narlikar: A Journey Through The Universe

By Jayant Narlikar

ISBN-10: 8123700261

ISBN-13: 9788123700267

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The notion of magnification is related to the field of view (sized Lpx × Kpy) that is reconstructed by the convolution. The reconstruction of an extended object, whose physical size ΔAx × ΔAy is larger than the field of view, is expected. So that the object may fully appear in the horizon, a transversal magnification γ = min(Lpx/ΔAx;Kpy/ΔAy) must be applied; it is the ratio between the horizon and the object widths. In this way, we may conceive that the adjustable magnification method results in adjusting the reconstructed object size to that of the field of view, which is imposed by calculation capacities or computation speed.

Basic experimental arrangements are provided and few explications on how it works are given. 1. 15 [SCH 94]. The coherent light from a laser is separated into a reference wave and an object wave. The reference wave is expanded and illuminates directly the sensor, through the 50% beam splitter cube. The object wave, after being expanded, illuminates the object. The object diffracts light to the sensor area. Since the light is coherent, the mixing between the reference and the object waves produces interferences that constitute the digital hologram.

In-line Gabor holography In-line Gabor holography refers to the pioneering works of Gabor [GAB 48], who was studying an optical method to compensate for the aberrations in electron microscopy. 21. The laser beam is expanded and collimated to 44 New Techniques in Digital Holography produce a parallel beam. It directly illuminates the sensor plane, and this beam constitutes the reference beam. In the path of the beam, an object diffracting light is inserted. This object can be opaque or slightly absorbing.

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A Journey Through The Universe by Jayant Narlikar

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