Refrigeration – Storage of solidified or liquified gas – Including cryostat
Patent
1992-04-02
1993-08-17
Capossela, Ronald C.
Refrigeration
Storage of solidified or liquified gas
Including cryostat
62 507, 250352, F25B 1900
Patent
active
052358178
ABSTRACT:
Parallel heat paths are provided by three nested tubes, the outer tube being of stainless steel and connected cantilevered to a housing at ambient temperature. The innermost tube forms a cold finger having a negligible temperature gradient and secured in thermal conductive isolation concentrically within an intermediate cold sleeve tube which is also concentric within the outer tube, the cold finger and cold sleeve tubes being made of copper. The tubes have a minimum diameter and specular facing surfaces to minimize radiation coupling which is the major source of heat transfer between the tubes. The two inner tubes have minimum thermal conductive coupling via thermal insulating tapered rings at one end and a thermal insulating support at the other end. A radiation detector is secured to the inner cold finger tube for receiving X-ray radiation from a specimen in an electron microscope. The other ends of the two inner tubes ar thermally conductively connected to a heat sink Dewar via braided copper straps.
REFERENCES:
patent: 3732421 (1973-05-01), Kunimoto et al.
patent: 3864570 (1975-02-01), Zingaro
patent: 4694175 (1987-09-01), Buller
patent: 4910399 (1990-03-01), Taira et al.
patent: 4931650 (1990-06-01), Lowe et al.
patent: 5077979 (1992-01-01), Skertic et al.
Bergensten Robert W.
Gallagher Brian W.
Botjer William L.
Capossela Ronald C.
North American Philips Corp.
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