Process for the simultaneous detection of several gases in a gas

Details Process for the simultaneous detection of several gases in a gas Process for the simultaneous detection of several gases in a gas

1989-11-22

1991-08-20

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, G01B 902

Patent

active

050408950

ABSTRACT:
Process and interferometric device for detecting and measuring the concentration, in a single operation, of all gases, having almost periodic absorption structures, contained in a gaseous mixture, each of the gases being associated with a characteristic path difference. Luminous flux is analyzed after passage through a cell containing the mixture, using to a multiple-wave interferometer, for example, a Fabry-Perrot interferometer, in which the inside faces of plates therein are highly reflective, and one of which plates is displaceable at a constant speed, it thus being possible to sweep a very wide range of path difference. Analysis of the output signal is performed frequency band by frequency band, by seeking the maximum.

REFERENCES:
patent: 3909132 (1975-09-01), Barrett
patent: 4718765 (1988-01-01), Fortunato et al.

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