Method and system for cryogenic cooling

Details Method and system for cryogenic cooling Method and system for cryogenic cooling

2005-08-31

2008-08-26

Doerrler, William C (Department: 3744)

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

C062S051100

Reexamination Certificate

active

07415830

ABSTRACT:
According to one embodiment, a method for improving heat transfer between a cold finger of a cryogenic cooler and a Dewar includes forming an annulus between the cold finger of the cryogenic cooler and the Dewar by inserting the cold finger into the Dewar. The cold finger has a first end and a second end. The method also includes inhibiting the formation of convective currents within the annulus in a direction between the first end and the second end. According to another embodiment of the invention, the cooling system includes a cryogenic cooler that includes a cooling section operable to generate cooling fluid and a cold finger operable to receive the cooling fluid. The cooling system also includes a Dewar formed with a void region coupled to an infrared detector. The cold finger is positioned within the void region of the Dewar creating an annulus. The cooling system also includes at least one obstruction disposed within the annulus and operable to inhibit the formation of convective currents in a direction along a length of the cold finger.

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Notification of Transmittal of The International Search Report and the Written Opinion of the International Searching Authority or the Declaration; International Filing Date: Aug. 30, 2006; International Application No.: PCT/US2006/033934; Applicant: Raytheon; 14 pages, Jan. 15, 2007.

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