Process for detecting gaseous substances

Details Process for detecting gaseous substances Process for detecting gaseous substances

1992-02-14

1993-08-31

Dzierzynski, Paul M.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 250343, G01N 2161, G01N 2139

Patent

active

052411770

ABSTRACT:
The invention relates to the field of analytical measuring technology and can be used for the detection of harmful substances in the atmosphere, for the process control of chemical gas phase reactions and for analyzing burnt off products, for example in laser surgery. The determination of the concentration of the substance to be detected ensues from the change in the modulation depth of the intensity of the irradiation of a laser operating according to the longitudinal two-mode-operation upon passage thereof through the gaseous medium to be analyzed.

REFERENCES:
patent: 3856406 (1974-12-01), Noble et al.
patent: 4425503 (1984-01-01), Watkins et al.
patent: 5015099 (1991-05-01), Nagai et al.
Allario et al, An Exp. Concept to Meas. Stratospheric Trace Constituents by Laser Heterodyne Spect. Appl. Phys. 23, No. (1980) p. 47.
P. L. Meyer and M. W. Sigrist, "Atmospheric pollution monitoring using CO.sub.2 -laser photoacoustic spectroscopy and other techniques", Rev. Sci. Instrum. 61(7), Jul. 1990, pp. 1779-1807.
E. Zanzottera, "Differential Absorption Lidar Techniques in the Determination of Trace Pollutants and Physical Parameters of the Atmosphere," 1990.

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