Apparatus and method for measuring the concentration of a paramagnetic gas
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United States of America Patent
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Aug 13, 2002
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N/A
app pub date -
Oct 30, 2000
filing date -
Oct 30, 1999
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Abstract
The object is to improve an apparatus for measuring the concentration of a paramagnetic gas in a gas sample, in such a way a measurement signal with a low noise ratio is obtained. The apparatus proposed according to the invention is characterized by a modulatable magnetic field source 4, 5, 6, 7 with an air gap 3 as a measuring chamber for receiving the gas sample; a modulation source 26 for outputting a modulation signal to the magnetic field source 4, 5, 6, 7; a measuring element 8, disposed inside the air gap 3 and heated to an operating temperature, for outputting a heat flow measurement signal; a filter device 28, 29, for filtering periodic fluctuations out, caused by the modulation of the magnetic field source, from the heat flow measurement signal caused by the modulation of the magnetic field source, the amplitude of the periodic fluctuations, being a measure for the proportion of the gas in the gas sample.
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