Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1998-02-19
2000-09-19
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250351, G01N 2135
Patent
active
061216178
ABSTRACT:
An infrared gas analyzer is formed of a source of infrared rays for emitting infrared flux; an infrared flux interrupting device for chopping the emitted infrared flux from the source of the infrared rays; a condensing optical system for obtaining a predetermined solid angle in the emitted infrared flux to thereby form a condensed flux; and a multi-reflection cell disposed at an outlet of the condensing optical system, to which the condensed flux is supplied and a gas to be measured is fed. The multi-reflection cell has a multi-reflection optical system formed of a plurality of concave mirrors. The analyzer also includes an infrared level detector for detecting an amount of infrared rays with a wavelength band absorbed by a component gas to be analyzed and contained in the infrared rays emitted by the multi-reflection cell. At least the condensing optical system, multi-reflection cell and infrared level detector are accurately positioned by using as a reference a position of the condensing optical system at which the condensed flux is emitted, and are coupled tightly at coupling positions without an air-flowing layer. Accordingly, the infrared gas analyzer can be made small to detect and analyze a low density component gas and for an explosion-proof environment.
REFERENCES:
patent: 4749276 (1988-06-01), Bragg et al.
patent: 5428222 (1995-06-01), Alexay
patent: 5734165 (1998-03-01), Unal et al.
Hirayama Noritomo
Sakaue Satoru
Sekine Yosheyuki
Uno Masahiro
Fuji Electric & Co., Ltd.
Hannaher Constantine
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