G - Physics – 01 – N
Patent
G - Physics
01
N
73/55
G01N 21/39 (2006.01) G01N 21/31 (2006.01)
Patent
CA 1333963
The invention relates to a method of and an apparatus for spectroscopic quantitative analysis of gases (4) in gas mixtures making use of periodically alternating monochroma- tic light (1) of at least two wavelengths, the light (1) of at least one wavelength being characteristic and the light (1) of at least one other wavelength being uncharac- teristic of the transmission of the gas to be determined. The transmission generates electrical signals comprising harmonic components of at least one uneven Fourier fre- quency of an emission period, the amplitude of which is proportional to the concentration of the gas (4) to be determined in the gas mixture, said Fourier frequency disappearing together with the concentration.
602207
Ridout & Maybee Llp
Riener Karl Stefan
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