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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Oct 11, 2006
filing date -
Oct 17, 2005
priority date (Note) -
Abandoned
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Abstract
In a device for providing challenge-response pairs a radiation detection element, a challenge-modifying element and preferably also a light source are arranged on the same side of an imaginary plane, which separates said radiation-detecting element from a radiation scattering element. Hence, generation of a speckle pattern having a desired minimum speckle size is facilitated and a more easily assembled device is provided.
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