Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1994-03-21
1995-11-07
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250345, 25033903, 25033904, 25033913, G01N 2161, G01N 2135
Patent
active
054649820
ABSTRACT:
An improved apparatus and method for measuring the concentration of carbon dioxide in respiratory gases. The apparatus is a non-dispersive gas analyzer attached in series with the respiratory airway which is universally compatible with any host system. The analyzer includes a housing which supports a sample cell containing the respiratory gases, and which contains an infrared radiation source encased in shock absorbing material, means for directing the radiation into a collimated beam path through the sample cell, means for splitting the beam path and directing it towards a pair of infrared detectors for measuring the amount of absorption of carbon dioxide in the sample cell. The analyzer is further improved by the use of two heating servos, one for regulating the temperature of the sample cell windows in order to inhibit condensation build-up and one for regulating the ambient temperature surrounding the detectors so as to ensure more accurate measurements. Calibration means is included within the analyzer housing for storing and providing information characterizing performance parameters of the analyzer.
REFERENCES:
patent: 4618771 (1986-10-01), Farren
patent: 5092342 (1992-03-01), Hattendorff et al.
patent: 5095913 (1992-03-01), Yelderman et al.
patent: 5206511 (1993-04-01), Apperson et al.
patent: 5254858 (1993-10-01), Wolfman et al.
Christensen Ken
Drucker Steven
Goder Alexey
Khalili Davood
Major Emery
Andros Incorporated
Glick Edward J.
Hannaher Constantine
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