Device for preventing evaporation of liquefied gas in a liquefied gas reservoir
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United States of America Patent
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Nov 17, 1992
Grant Date -
N/A
app pub date -
Jan 15, 1991
filing date -
Jan 15, 1991
priority date (Note) -
Expired
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Abstract
A device for preventing evaporation of liquefied gas in a liquefied gas reservoir used to cool an EDS detector of an electron microscope or the like is disclosed. A cold head of a cryogenic refrigerator is disposed so as to fit an opening of the top of the liquefied gas reservoir and moreover a temperature measuring instrument or a level gauge is disposed within the liquefied gas reservoir so that the cryogenic refrigerator is automatically operated depending on the temperature within the liquefied gas reservoir or on change in the liquid level of liquefied gas. In the manner vaporized gas is condensed and reliquefied, thus suppressing wasteful dissipation of vaporized gas.
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