Method of temperature measurement by correlation of chemiluminescent spectrum emitted by a flame with stored theoretical emission spectra for OH and/or CH radicals

A device for determining the adiabatic temperature of a flame, the device comprising:

• a spectrograph;
• an optical sensor fiber connected to the spectrograph;
• a subtractor connected to
• the spectrograph, the subtractor subtracting background effects from a chemiluminescence spectrum measured by the spectrograph;
• an output unit;
• a first comparator, a second comparator and a processing unit arranged in series between the subtractor and the output unit, the measured chemiluminescence spectrum being compared in the first comparator with theoretically determined emission spectra to find a theoretically determined emission spectrum that coincides with the measured chemiluminescence spectrum, the found theoretically determined emission spectrum being assigned a Boltzmann temperature in the second comparator, and an adiabatic flame temperature being determined from the Boltzmann temperature in the processing unit;
• and
• a working memory;
• wherein the first comparator, the second comparator and the processing unit are functionally connected to the working memory, and the processing unit is functionally connected to the subtractor.