Radiant energy – Infrared-to-visible imaging – Including means for scanning field of view
Patent
1988-10-31
1991-01-08
Howell, Janice A.
Radiant energy
Infrared-to-visible imaging
Including means for scanning field of view
250342, 250353, 350 13, H01J 3149, G02B 1314, H01L 3104
Patent
active
049838377
ABSTRACT:
Apparatus and methods for modifying existing forward looking infrared systems and for forming new forward looking infrared systems. Generally, the system comprises a Galilean afocal system in combination with a reimaging afocal system. A reimaging afocal lens system is formed with at least first and second lenses and a plane for forming an image therebetween. A thermal reference source is positioned in the imaging plane of the reimaging system. The method for modifying an existing forward looking infrared imaging system includes positioning the reimaging system along the optical path of the system between the Galilean lens combination and the scanning device. According to a method for forming a forward looking infrared system an imaging lens system is arranged along an optical path in combination with a detector array to focus collimated radiation upon the detector array. The detector array subtends the field of view along a first direction. A reimaging afocal system is incorporated along the optical path to provide collimated radiation to the imaging lens system and a scanning device is positioned between the reimaging afocal system and the imaging lens system to vary the field of view along a second direction in order to provide a two dimensional image. A Galilean afocal lens system is positioned to receive radiation from a scene and transmit the radiation to the reimaging afocal system.
REFERENCES:
patent: 4280050 (1981-07-01), Callender et al.
patent: 4427259 (1984-01-01), Fjeldsted
Cooper Erwin E.
Davis Franklin L.
Sagan Stephen F.
Grossman Rene E.
Hanig Richard
Howell Janice A.
Romano Ferdinand M.
Sharp Melvin
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