Abstract: A low-temperature refrigeration system (10) is disclosed for accurately maintaining an instrument (11) with a time varying heat output at a substantially constant predetermined cryogenic temperature. The refrigeration system (10) controls the temperature of the instrument (11) by accurately adjusting the pressure of coolant at a heat exchanger interface (12) associated with the instrument (11). The pressure and flow of coolant is adjusted through the use of one or two circulation loops and/or a non-mechanical flow regulator (24) including a heater (32). The refrigeration system further provides a thermal capacitor (16) which allows for variation of the cooling output of the system (10) relative to a cooling output provided by a cooling source (14).

Abstract: A compact, reliable, and efficient cryogenic cooling system that can provide cryogenic cooling for a variety of desirable uses. The system is particularly desirable to provide cooling for infrared detectors in temperature ranges from 40K to 77K, and may be advantageously used in multi-stage systems to produce temperatures as low as 5K. In cryogenic cooling systems using a compressor and Joule-Thomson valves, working fluids, such as nitrogen, can be precooled to temperatures substantially below 165K at the input to a Joule-Thomson valve, and the power input to systems of our invention providing cooling 77K, for example, can be reduced by a factor of 4.5.

Abstract: The vent line of a space-borne solid subliming cooler is formed to provide a heat radiator which radiates much of the heat losses otherwise parasitically conducted back to the cooler thereby permitting the use of certain high heat capacity cryogens at operating and working temperatures requiring very low operating vapor pressures but without as much parasitic heat conduction loss as is associated with conventionally vented solid subliming coolers.

Abstract: A support for a cryogen container, particularly adapted for use in spacecraft, provides a dual support. One portion of the structure supports the container in the absence of acceleration force, and the other portion of the structure supports the container in the presence of acceleration forces. The support includes a first connector means and second connector means. A first support extends between the first and second connector means. The first support is constructed of high-strength metal and is adapted at its ends for structural engagement and support of said first and second connector means. A second support also extends between said first and second connector means. The second support is constructed of material having low thermal conductivity, has a degree of elasticity, and provides support of said first connector means from said second connector means in the presence of normal forces imposed by the container and its contents.