Rapid cooldown dewar

Details Rapid cooldown dewar Rapid cooldown dewar

1991-06-03

1993-02-23

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

244 316, 250352, F25B 1902

Patent

active

051879395

ABSTRACT:
A dewar (20) useful in rapidly cooling a sensor (28) supported thereon includes a bore tube assembly having a cylindrical dewar bore tube (22) with an end cap (24) at one end to close the bore tube (22). The bore tube assembly is cooled by directing a stream of coolant at the interior of the end cap (24). The sensor (28) is mounted directly to the exterior surface of the end cap (24). A cold shield (34) partially encloses the sensor (28). A cold shield support bracket (38) mounts the cold shield (34) to the cylindrical side walls of the dewar bore tube (22) at a mounting location (36) axially displaced from the end cap (24) and therefore less effectively cooled than the end cap (24), so that heat is extracted from the support bracket (38) and the cold shield (34) less rapidly than from the sensor (28). From an uncooled starting condition, the sensor (28) is cooled to its operating temperature, and the cold shield (34) is cooled to its operating temperature, in about the same time.

REFERENCES:
patent: 3372556 (1968-03-01), Waldman
patent: 4266959 (1981-05-01), Welch
patent: 4466252 (1984-08-01), Hood
patent: 4474036 (1984-10-01), Ball et al.
patent: 4918308 (1990-04-01), Neitzel et al.

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