Optics: measuring and testing – By dispersed light spectroscopy – With background radiation comparison
Patent
1988-12-02
1991-03-26
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With background radiation comparison
356320, 356437, 250339, G01J 3427, G01N 2135
Patent
active
050023918
ABSTRACT:
What is disclosed is a method and a system for (trace) gas analysis, specifically NH.sub.3 analysis in flue gases exhausted from power plants or in industrial waste gases. In this method and system, a laser is reversed between two of its intrinsic resonance lines whereof one wavelength corresponds to an absorption maximum and the other corresponds to an absorption minimum of the gas to be detected. The extinction E and thus the concentration of the gas under analysis is derived from the ratio of the values of intensity attenuation at the two wavelengths.
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Neckel Hartmut
Wolfrum Jurgen
McGraw Vincent P.
Mutek-Laser und optoelectronische Gerate GmbH
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