Wide temperature range heating/cooling interface with rapid resp

Details Wide temperature range heating/cooling interface with rapid resp Wide temperature range heating/cooling interface with rapid resp

1998-03-31

2000-02-08

Atkinson, Christopher

Heat exchange

With adjustor for heat, or exchange material, flow

165185, F28F 2700

Patent

active

060218452

ABSTRACT:
A sapphire interface with a closed cycle cryogenic cooler replace liquid nitrogen in cryotraps for gas chromatographs, cryofocusers for gas chromatographs, DMA's and DSC's. Inverse thermal properties of sapphire allow the closed cycle cooler to function at cryogenic temperatures at one end of a sapphire element while temperature of a test element is raised at the other end. Quartz and silicon are alternatives to sapphire. Substantial mass of the sapphire interface is eliminated by making the test element an integral part of the assembly and enables use of a smaller capacity cooling system. Low mass provides rapid temperature changes when switching between heating and cooling. The cooling requirement remains substantially constant, whether a test sample is heated or cooled.

REFERENCES:
patent: 3229755 (1966-01-01), Komarow
patent: 3330333 (1967-07-01), Moss
patent: 3643734 (1972-02-01), Deschamps
patent: 4112699 (1978-09-01), Hudson, III et al.
Joe Foreman and Kevin Reed, "Dynamic Mechanical Analyzers: How do They Work?", excerpts from TA Instruments marketing brochure, Technical Publication #TA 229, (4 sheets).
"Features of G.C. Cryo-Trap", excerpts from Scientific Instrument Services, Inc. marketing brochure (4 sheets), (A copy of the Scientific Instrument Services, Inc. brochure is attached thereto, Application Note No. 19.)(11 pages).

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