Imaging System with Wavefront Modification
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United States of America Patent
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Issued Date -
Nov 4, 2010
app pub date -
Oct 10, 2008
filing date -
Oct 12, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An imaging system (10) comprises an objective (1), an image detector (2) placed in an image plane of the objective, and a calculation unit (3) intended for executing a digital processing of an image captured by the detector. The objective is suitable for modifying a wavefront of a radiation which enters the system, so that an illumination on the detector which is produced by a source of the radiation is constant for a large interval of variation of a distance of separation of the source from the objective. The depth of field of the system is thus increased, and the calculation unit can be simplified by using a constant filter. The modification of the wavefront is created by a profile which is invariant under any rotations about the optical axis of the objective.
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