Gas analyzing

Details Gas analyzing Gas analyzing

1973-06-28

1977-02-15

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250344, 250343, G01N 2100

Patent

active

040083942

ABSTRACT:
Dual-beam comparison of gas absorption characteristics in which a single source and single detector of radiant energy and single chopper disc are used in sample gas and reference gas paths. Ambient atmosphere or gas directed through a sample gas chamber can be analyzed. Multiple gas analyses, of a plurality of gases or a plurality of constituents of a gas, can be performed simultaneously utilizing the single chopper disc with a plurality of optical gas assemblies. Each such assembly includes a single source of radiant energy, means for directing the radiant energy along sample and reference gas paths to a single detector for such radiant energy. The multiple units are mounted so that the single chopper disc cyclically interrupts radiant energy in the respective sample and reference gas paths in predetermined phase relationship. The combined sample gas and reference gas path response of the single detector for each gas analyzing unit is directed to phase-sensitive signal-separation circuit means. The single chopper disc is also used to generate phase reference signals for gating the phase-sensitive signal separation circuit means to produce a voltage output for the sample and reference gas paths, V.sub.s and V.sub.r, respectively. An automatic gain control function, to eliminate or minimize variations in source intensity, detector characteristics, and circuit components influencing both gas paths equally, is provided by electronic ratio circuit means or feedback circuit means.

REFERENCES:
patent: 2904687 (1959-09-01), Sobcov et al.
patent: 2938118 (1960-05-01), Martin
patent: 3162761 (1964-12-01), Luft
patent: 3498132 (1970-03-01), Smith et al.
patent: 3562524 (1971-02-01), Moore
patent: 3569696 (1971-03-01), Karlson
patent: 3659941 (1972-05-01), Tong
patent: 3678262 (1972-07-01), Herrmann
patent: 3678269 (1972-07-01), Malek

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