Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-04-03
1989-07-18
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250339, 356152, G01J 120
Patent
active
048496200
ABSTRACT:
The system allows homing on a useful target to be obtained in the presence of considerable parasite sources, such as the sun, in the field of observation. It includes elements for the spatial and spectral discrimination of the infrared light sources, formed with a detector strip preceded by a fixed modulation grid, the uniaxial field scanning device, switchable electronic filtering, one band pass and the other low pass, and switching optical filtering, one with very narrow band and the other with wide band. The grid is preferably formed by herringbone patterned tracks. The narrow band filter may be centered towards 4.4 microns and the wide band filter covers 3 to 5 microns for providing homing of a missile by optical deviation heading measurement in a ground/air or sea/air defense system.
REFERENCES:
patent: 3174045 (1965-03-01), Whitney
patent: 3475963 (1969-11-01), Astheimer
patent: 4028544 (1977-06-01), Jourdan et al.
Revue Technique Thomson-CSF, vol. 2, No. 2, Jun. 1970, pp. 263-282, Paris, FR; G. Couderc: "Ecartometre Infrarouge Semiramis" *FIGS. 3,6; p. 269, ligne 4-p. 271, ligne 10*.
Coateval Gilbert
Cojan Yves
Guerin Bernard
"Thomson-CSF"
Shami Khaled
Westin Edward P.
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