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US 4,361,011 AGranted
Cryogenic cooling system
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRobert E. Callender, James T. Montgomery
Life of this patent
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Abstract
In order to conserve battery power of an electrically-operated cryogenic ler for an infrared imaging detector, a control logic is inserted between the battery and the cooler. This logic operates to maintain the detector at a higher than optimum operating temperature in a "STANDBY" mode, but holds the detector at optimum temperature in an "ON" mode.
Claims3
A cryogenic cooling system including an electrically-powered cooling head means, a temperature sensor for said cooling head, a battery for powering said means, the improvement comprising:
- a control means between said battery and said cooling head means, said control means including:
- means, responsive to said temperature sensor for controlling said battery to said cooling head means until a first predetermined temperature of said cooling head is reached;
- means, responsive to manual control and to said temperature sensor, for connecting said battery to said cooling head means until a second predetermined temperature of said cooling head means is reached, whereby said second temperature is lower than the first and whereby first temperature is maintained until the last-mentioned means responsive is operated.
Dependencies are inferred from the claim text.