Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1991-03-15
1994-07-26
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033901, 250340, 250343, 356437, G01N 2135, G01N 2105
Patent
active
053329015
ABSTRACT:
To measure water vapor and carbon dioxide, a gas analyzer includes a light source, a reference flow cell, a sample flow cell, and a detector. The light source, flow cells and detector are arranged so that the detector detects light transmitted from said light source through said reference flow cell and through said sample flow cell and generates a reference signal representing the light transmitted through a reference gas in said reference flow cell and a sample signal representing the light transmitted through a sample gas in said sample flow cell. The reference signal is subtracted from the sample signal to obtain an independant variable. A signal representing gross concentration of the carbon dioxide as a dependant variable is obtained from said independent variable from a stored empirically determined third power polynomial. The polynomial includes terms having at least first, second and third powers of said independant variable. Each of these terms includes a coefficient determined empirically so that values of the dependant variable, gross concentration, can be determined for different independant variables.
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Eckles Robert D.
McDermitt Dayle K.
Welles Jonathan M.
Carney Vincent L.
Glick Edward J.
Hannaher Constantine
Li-Cor Inc.
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