| 摘要 |
PCT No. PCT/EP89/00596 Sec. 371 Date Mar. 20, 1990 Sec. 102(e) Date Mar. 20, 1990 PCT Filed May 31, 1989 PCT Pub. No. WO89/12222 PCT Pub. Date Dec. 14, 1989.In a method of and an apparatus for spectroscopic quantitative analysis of gases in gas mixtures, periodically alternating monochromatic light of at least two wavelengths is used. The light of one wavelength is characteristic whereas light of the other wavelength is uncharacteristic of the transmission of the gas to be determined. The transmission generates electrical signals comprising harmonic components of at least one uneven Fourier frequency of an emission period, the amplitude of which is proportional to the concentration of the gas to be determined in the gas mixture, the Fourier frequency disappearing together with the concentration.
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