Measuring low levels of methane in carbon dioxide
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United States of America Patent
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Issued Date -
Nov 8, 2007
app pub date -
Apr 19, 2007
filing date -
Apr 19, 2006
priority date (Note) -
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Abstract
Low concentrations of methane in a gas mixture containing a substantial concentration of carbon dioxide can be detected and quantified using absorption spectroscopy in the infrared spectral region. Absorption spectra can recorded using tunable diode lasers as the light source. Modulation of the laser signal and demodulation of the resultant detector response yields dependable measurements that may be conducted with very little maintenance in demanding environments.
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