Physics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988infph..28...43r&link_type=abstract
Infrared Physics (ISSN 0020-0891), vol. 28, Jan. 1988, p. 43-54.
Physics
1
Cryostats, Electrical Resistance, Liquid Helium, Liquid Nitrogen, Switching, Gas Viscosity, Heat Exchangers, Infrared Detectors, Temperature Control, Thermal Conductivity
Scientific paper
A technique for establishing a stable intermediate temperature stage in liquid He/liquid N2 double vessel cryostats is described. The tertiary cold stage, which can be tuned to any temperature between 10 and 60 K, is ideal for cooling IR sensors for use in astronomy and physics applications. The device is called a variable-conductance gas switch. It is essentially a small chamber, located between the cold stage and liquid helium cold-face, whose thermal conductance may be controlled by varying the pressure of helium gas within the chamber. A key feature of this device is the large range of temperature control achieved with a very small (less than 10 mW) heat input from the cryogenic temperature control switch.
Chuter Timothy C.
McLean Ian S.
Nolt Ira G.
Radostitz J. V.
Rayner John T.
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