Radiant energy – Infrared-to-visible imaging – Including image tube-type detector
Patent
1977-05-25
1978-06-27
Willis, Davis L.
Radiant energy
Infrared-to-visible imaging
Including image tube-type detector
250338, H01J 3149
Patent
active
040977420
ABSTRACT:
A thermal retina disposed in a vacuum envelope receives thermal radiation emitted from an object being viewed includes a semiconductor bolometric thin film target, a metallic heat sink mesh disposed between the thermal radiation and the target to support the target where the heat sink mesh has webs to define web areas of the target and holes surrounded by the webs to define hole areas of the target and a contacting electrode disposed over the holes connecting the film target in the holes to the webs. A readout scanning electron beam is generated in the envelope to provide on the electrode an electric signal proportional to the resistance of the target due to the thermal radiation in the web areas and proportional to the resistance of the target due to the thermal radiation in the hole areas. A processing circuit disposed externally of the envelope coupled to the electrode is responsive to the electric signal to make a side-by-side comparison of each of the hole area resistances of the target due to the thermal radiation with the surrounding web area resistance of the target due to the thermal radiation and to display only any change of resistance of the target in each of the hole areas due to the thermal radiation to reproduce the viewed object.
REFERENCES:
patent: 1936514 (1933-11-01), Lengnick
patent: 4032783 (1977-06-01), Koda
Hill Alfred C.
International Telephone & Telegraph Corporation
O'Halloran John T.
Willis Davis L.
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