Pyrometer for temperature measurement of selective objects of unknown and variable emissivity

An active multiband pyrometer for non-contact temperature measurement of objects of unknown and spectrally-dependent emissivity was developed.It enables temperature measurement of the objects of temperature within 500C-1200C range with a speed up to 200 Hz.The pyrometer consists of a source of infrared radiation that emits radiation on the object under measurement and a receiver that measures radiation reflected and emitted by the object into four narrow spectral bands.Tests show that the developed pyrometer enables temperature measurement of real selective objects with the standard uncertainty equal to 1 % of the output temperature in its temperature measurement range.