Optical system including focus-defocus focal plane array compens

Details Optical system including focus-defocus focal plane array compens Optical system including focus-defocus focal plane array compens

1993-10-04

1995-03-21

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

348625, 348340, 348342, 348348, 348252, 2502081, 250332, 250347, 359 41, G02F 1137, G02F 11335, G02B 504, H04N 718

Patent

active

054001617

ABSTRACT:
An optical system is described including an array of photodetectors, each photodetector having a surface, and a focusing system employing a liquid crystal phased array for focusing a beam of electromagnetic energy on the surface of at least one of the photodetectors. The focusing system further includes a focus-defocus technique for periodically defocusing the beam of electromagnetic energy on the surface of at least one of the photodetectors. With such an arrangement, a focusing system is provided wherein fixed pattern noise can be decreased.

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