Spectral pyrometry (Review)

In the emission spectra of many objects, there are regions where the intensity distribution is similar to the blackbody spectrum. This allows one to determine the temperature by recording the emission spectrum and comparing it to a Planck spectrum. Experimental or calculated data on the emissivity of such objects are not necessary because the temperature is determined as a parameter of the distribution observed. This property characterizes the emission spectra of gaseous and solid-phase flames, erosion plasmas of surface discharges, metals, semiconductors, dielectrics, micro- and nanoparticles, and heterogeneous media (powder mixtures and ceramics) at temperatures both lower and higher than the melting temperature. Spectrometers with photodetector arrays sensitive in the wavelength range of 200-1100 nm are used to record spectra. Such spectrometers allow spectrum recording and determination of the radiator temperature in the temperature range of 800 K-140 kK within a time of similar to 1 ms. The specific features of the method, examples of its application, measurement characteristics, unsolved problems, and prospects are discussed in the review.