Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1995-07-28
1997-12-02
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033913, 250343, 250373, G01N 2161
Patent
active
056939450
ABSTRACT:
An ultraviolet light source is provided on one end of a cell into which a sample gas is introduced. A beam splitter for dividing beams which have been transmitted through the cell into two optical paths is provided on the other end of the cell. A first detector is provided in one optical path, and a second detector is provided in the other optical path. A gas filter filled with a component to be measured is positioned between the detectors and beam splitter so that a concentration of the component to be measured may be obtained on the basis of a difference between the output of the first detector and the product of the output of the second detector and an appointed constant. Influences resulting from components coexisting in the sample gas are reduced. Alternatively, an infrared light source may be provided on one end of a sample cell. A gas filter filled with a gas the same as the gas to be measured is provided at the other end of the sample cell. A reference filter filled with a non-absorbing gas is positioned parallel to the gas filter. A beam splitter and a detector are sequentially disposed downstream from the gas filter, and a mirror is disposed downstream from the reference filter. The mirror is positioned such that beams which passed through the reference filter may be directed to the beam splitter and, subsequently, the detector.
REFERENCES:
patent: 3571589 (1971-03-01), Barringer
patent: 3860344 (1975-01-01), Garfunkel
patent: 3869613 (1975-03-01), Link et al.
patent: 3970430 (1976-07-01), Reader, Jr. et al.
patent: 4297577 (1981-10-01), Coe et al.
patent: 4914719 (1990-04-01), Conlon et al.
patent: 5572032 (1996-11-01), Fujiwara et al.
Akiyama Shigeyuki
Fujiwara Masahiko
Koga Fujio
Shimizu Naohito
Uno Toshihiko
Fields Carolyn E.
Horiba Ltd.
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