초록 ▼

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 (

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.

대표청구항 ▼

A method for determining a parameter such as pressure, temperature or concentration of a gaseous substances present in combustion processes and other high temperature processes, comprising (a) transmitting spectral broad-band, continuous light towards the gaseous substances, a part of the light bein

A method for determining a parameter such as pressure, temperature or concentration of a gaseous substances present in combustion processes and other high temperature processes, comprising (a) transmitting spectral broad-band, continuous light towards the gaseous substances, a part of the light being absorbed by the gaseous substances and a part of the light being transmitted through said gaseous substance; (b) spectrally dividing the transmitted light, whereby the absorption spectrum of the gaseous substances is obtained; (c) recording the absorption spectrum of the gaseous substances in a studied wavelength range a large number of times, each recording taking place sequentially by sweeping the absorption spectrum relative to a single-channel detector and for such a short time that the total intensity of the entire wavelength range is constant during each recording; (d) generating the means value of the recorded absorption spectra; and (e) calculating the parameter on the basis of the appearance of the mean absorption spectrum and absorption spectra determined for known conditions.