Composite fresnel lens having array of lens segments providing l

Details Composite fresnel lens having array of lens segments providing l Composite fresnel lens having array of lens segments providing l

1996-12-02

1999-03-02

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250DIG1, 359742, G02B 308, G02B 13193

Patent

active

058774998

ABSTRACT:
A composite Fresnel lens useful in an infrared passive detection system includes an array of Fresnel lens segments having a given vertical centerline and a curvature of a given radius. The Fresnel lens segments fall in first and second groups. Each Fresnel lens segment in the first group has a long detection range and a width less than one-third of the diameter of an original whole Fresnel lens from which the segment was taken. Also, each lens segment of the first group has a geometrical center located horizontally from the vertical centerline of the array along the curvature of the array through a circumferential distance less than one-fourth of the radius of curvature of the array. Each Fresnel lens segment in the second group has a short detection range less than the long detection range by a predetermined amount and a width less than one-third of the diameter of an original whole Fresnel lens from which the segment was taken. Also, each lens segments in the second group has a geometrical center located horizontally from the vertical centerline of the array along the curvature of the array through a circumferential distance less than one-half of the radius of curvature of the array. The Fresnel lens segments have respective optical centers which are aligned along the vertical centerline of the array.

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