Photoelectric gas analyzer

Details Photoelectric gas analyzer Photoelectric gas analyzer

1980-09-22

1982-04-27

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

250343, 356 51, G01J 348

Patent

active

043268072

ABSTRACT:
An analyzer for measuring the combined NO and NO.sub.2 concentrations includes a hollow cathode lamp with nitrogen/oxygen filling emitting radiation which is alternatingly passed through two narrow-band interference filters, one having a transmission range clearly outside any NO absorption bands and its NO.sub.2 absorption equals the difference of the absorption coefficients for NO and NO.sub.2 in the transmission band of the other filter. These two beams pass through a measuring gas cell and are photoelectrically detected for further processing.

REFERENCES:
patent: 3694086 (1972-09-01), May
patent: 3893770 (1975-07-01), Takami et al.
patent: 3947685 (1976-03-01), Meinel
patent: 4176963 (1979-12-01), Fabinski et al.
Lefers, Analytical Chemistry, vol. 52, No. 9, Aug. 1980, pp. 1424-1426.

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