Apparatus for the exact reconstruction of the object wave in off-axis digital holography
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United States of America Patent
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Feb 25, 2014
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Mar 7, 2013
app pub date -
Dec 30, 2011
filing date -
Sep 2, 2011
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Abstract
A method and apparatus for preparing a digital hologram representing an image of an object includes generating a measurement beam and a first reference beam, irradiating the object by the measurement beam, and guiding the measurement beam reflected to an optical sensor. The method also includes guiding the first reference beam to a first mirror, and guiding the reflected beam to the optical sensor so that both beams generate an interference pattern on the sensor. The method includes providing a digital signal representing the interference pattern on the optical sensor, to obtain a digital hologram, and subjecting the digital hologram to a Fourier transform in the spatial frequency domain to obtain a spectrum. The method further includes replacing a section of a first image term overlapped by a DC-term by a corresponding section of a second image term.
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