Spectroscopic plasma torch for microwave induced plasmas
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United States of America Patent
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Jan 21, 1992
Grant Date -
N/A
app pub date -
May 9, 1989
filing date -
May 9, 1989
priority date (Note) -
Expired
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Abstract
A spectroscopic plasma torch suitable for use at atmospheric pressure is disclosed. The torch utilizes a microwave induced helium plasma confined in a plasma discharge tube. The plasma is suspended and stabilized by a vortex flow of helium. The torch includes a high velocity gas jet for introducing sample materials into the plasma. The design avoids the formation of carbon deposits in the plasma discharge tube caused by the premature pyrolysis of organic materials outside the plasma and prevents other sample materials from being adsorbed on the surface of the plasma tube. Because of these characteristics, the torch is particularly well suited for use as a component in a gas chromatography detector which employs helium as the plasma support gas.
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