Apparatus for detecting a plurality of gases

Details Apparatus for detecting a plurality of gases Apparatus for detecting a plurality of gases

1987-08-21

1990-01-02

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01J 100

Patent

active

048915181

ABSTRACT:
A gas detector for detecting a combination of at least three gasses employs an optical filter having a spectral passband shaped and positioned to produce substantially equal responses from a single detector to a given concentration of any single one of the gasses or to a concentration any two or more of the gasses. A filter spectrum encloses substantially equal areas of the absorption spectra of the gasses. The filter includes a spectral bandwidth, cut-on maximum wavelength, cut-on slope, cut-off maximum wavelength and cut-off slope, adjusted for controlling the areas of the gas absorption spectra enclosed therein.

REFERENCES:
patent: 4264814 (1981-04-01), Freund et al.
patent: 4549080 (1985-10-01), Baskins et al.

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