Adaptive orifice joule-thomson cryostat with servo-control

Details Adaptive orifice joule-thomson cryostat with servo-control Adaptive orifice joule-thomson cryostat with servo-control

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 49/02 (2006.01) F16K 31/64 (2006.01) F25B 9/02 (2006.01)

Patent

CA 2178124

A load temperature regulated, adaptive-orifice, Joule-Thomson cryostat which controls refrigeration output by servo-controlled gas flow regulation at the Joule-Thomson cryostat expansion, or throttling, orifice. The mechanism consists of a variable aperture needle valve 19 with an expansion orifice that is controlled by a miniature, electrically driven transducer 41, using closed-loop feedback control 59 which monitors 51 the temperature at or on a thermal load point and adjusts the gas throughput so as to maintain a desired cold temperature constant at the load 15.

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