Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1966-05-09
1976-03-02
Wilbur, Maynard R.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250338, 250370, G01J 100
Patent
active
039420108
ABSTRACT:
A cryogenically cooled infra-red detection cell assembly comprises a Dewalask type of thermal insulation casing. The closed end of the Dewar casing is the front end of the assembly and is adapted to have a lead sulfide infra-red transducer mounted on the inside face of the casing inner end wall, and to have the casing outer end wall form a part of a lens system for focusing on the transducer. A Joule-Thomson cryostat projects into the casing so as to maintain liquid nitrogen adjacent the outside face of the inner end wall. A mass of absorbent packing is placed in the Dewar casing adjacent its closed end, just ahead of the cold end of the cryostat to retain the liquid nitrogen there. The cold end of the cryostat is mounted to a metal mandrel, with the rear end of the mandrel serving as a mount for a small piece of gold-doped germanium. This piece of doped germanium acts as a variable resistance at the critical range of temperature control for the front end of the cryostat, and is operatively connected to a thermostat circuit which actuates the valve controlling the flow of gas into the cryostat. The electrical connections to the lead sulfide transducer consist of conductive strips which extend rearwardly along the inside surface of the inner lateral wall of the Dewar casing. Shieldings to prevent microphonics due to casing vibration, and microphonics due to gas motion in the cryostat, are deposited on the surfaces of the lateral walls of the Dewar casing.
REFERENCES:
patent: 3103585 (1963-09-01), Johnson et al.
patent: 3114041 (1963-12-01), Amsterdam
Peterson Eugene W.
Winner Marvin R.
Wurtz, Jr. Howard P.
Buczinski S. C.
Johnston Ervin F.
Keough Thomas Glenn
Sciascia Richard S.
The United States of America as represented by the Secretary of
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