Method and apparatus for determining parameters of gaseous substances

Abstract

A method for determining parameters, especially pressure, temperature, concentration, number of particles and particle size distribution, of gaseous substances present in combustion processes and other high temperature processes, comprises transmitting spectrally broad-band light through an object (2) of measurement, spectrally dividing the light transmitted through said object, and recording the spectral distribution of the light in the studied wavelength range a large number of times. Each recording occurs sequentially in that the spectrally divided light is swept relative to a one-channel detector and for such a short time that the total light intensity of the entire wavelength range is constant during each recording. After that, the mean value of said recorded spectral distributions is generated, and the required parameters are calculated on the basis of said mean value spectral distribution, the appearance of said means value spectral distribution, as well as spectra calculated or recorded for known conditions, being utilized for said calculation. An apparatus comprises means for carrying out the method.

Dependencies are inferred from the claim text.