Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1994-07-25
1995-10-10
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 356437, G01N 2135, G01N 2105, G01N 2161
Patent
active
054573203
ABSTRACT:
To measure water vapor and carbon dioxide, a gas analyzer includes a light source, a reference flow cell, a sample flow cell, a detector and a source of gas. The light source, flow cells and detector are arranged so that the detector detects light transmitted from said light source through the flow cells. The flow cells have folded paths for the light. A reference signal is subtracted from a sample signal to obtain an independant variable. Carbon dioxide and air mixed with carbon dioxide are supplied as required. The carbon dioxide is supplied from a container through capillary tubes. Heat is applied to the tubes to control the flow rate. A signal representing gross concentration of the carbon dioxide as a dependant variable is obtained from said independent variable from an empirically determined polynomial.
REFERENCES:
patent: 4914719 (1990-04-01), Conlon et al.
patent: 5092342 (1992-03-01), Hattendorff et al.
patent: 5340987 (1994-08-01), Eckles et al.
Eckles Robert D.
McDermitt Dayle K.
Welles Jonathan M.
Carney Vincent L.
Fields Carolyn E.
Glick Edward J.
Li-Cor Inc.
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