Method and apparatus for determining the absorption of electromagnetic radiation by a gas
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United States of America Patent
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Apr 9, 1996
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N/A
app pub date -
Mar 1, 1996
filing date -
Mar 3, 1994
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Abstract
The invention provides a method consisting successively in producing two electromagnetic radiations of the same wavelength that is modulated as a function of time over a range of wavelengths, a 'measurement' one of said radiations passing through a gas that presents selective absorption for said radiation in the range, while the other radiation constitutes a 'reference' radiation. Each of said radiations is transformed into a respective 'measurement' or 'reference' electrical signal. The measurement signal is divided by the reference signal to obtain a first quotient electrical signal which is in turn split into two portions: a time-varying AC portion and a DC portion that does not vary with time. The AC portion is divided by said DC portion in order to obtain a second quotient electrical signal representative solely of the electromagnetic radiation absorbed by the gas.
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