Small-size hermetic helium 3 refrigeration stage

Details Small-size hermetic helium 3 refrigeration stage Small-size hermetic helium 3 refrigeration stage

1980-02-19

1981-11-17

Capossela, Ronald C.

Refrigeration

Refrigeration producer

Evaporator, e.g., heat exchanger

62 48, F25B 1900

Patent

active

043003605

ABSTRACT:
The invention provides a small-size hermetic refrigeration stage containing helium 3 and easily incorporated in a conventional helium 4 metal cryostat.
The stage consists essentially of a metallic enclosure containing a certain volume of helium 3 and having a first receptacle constituting the pumping chamber and consisting a mass of an adsorbing body for the helium 3 at a very low temperature, a second receptacle constituting a condenser for the cooled helium 3 and a duct.
The stage of the invention is particularly suited for maintaining the sensitive element of an infrared detector at a temperature of less than 1.degree. K.

REFERENCES:
patent: 3397549 (1968-08-01), Daunt
patent: 4111002 (1978-09-01), Van Mal et al.
patent: 4136526 (1979-01-01), Chanin et al.
Yamamoto, J: "A He.sup.3 Cryostat Using Charcoal Adsorption Pump for a Far Infrared Detector," Japanese Jour. of App. Physics vol. 14 No. 11, Nov. 1975.
Walton, D. et al., "A Compact .sup.3 He Cryostat Using Activated Charcoal", The Review of Scientific Instruments, vol. 42 (1971) pp. 1265-1266.
Tanner, D. B., "Fluctuation Contrabution to the Far-Infrared Transmission of Lead Films," Physical Review B, vol. 8 No. 11 (1973).
Mate, C. F.: ".sup.3 He Cryostat with Adsorption Pumping," The Review of Scientific Instruments, vol. 36 (1965) pp. 369-373.

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