FIELD: thermometry.
SUBSTANCE: invention relates to the field of thermometry and can be used to measure the local temperature of a heated body. To measure the temperature of a real body, a spectrometer of a given accuracy is used, which is pre-calibrated by finding its spectral transfer function for the wavelengths of the entire operating range. For this, in the operating range of the spectrometer, the radiation spectrum of the model of an absolutely black body, located at the temperature of one of the well-studied phase transitions of pure metals, is recorded. Spectral signals of the spectrometer are measured in the recorded spectrum for discretely specified wavelengths. For the wavelengths of the same name, the values of the spectral energy brightness of an ideal blackbody, corresponding to a given temperature of the phase transition, are calculated using the Planck formula. For each discretely taken wavelength, the ratio of the calculated spectral radiance of an ideal blackbody to the spectral signal of the spectrometer is found. The dependence of the calculated ratio on the wavelength is mathematically approximated and the obtained mathematical dependence is taken as the spectral transfer function of the spectrometer. This completes the calibration of the spectrometer. After that, the local temperature of the real body is measured. For this, in the working spectral range of the spectrometer, the radiation spectrum of the local area of interest of the real body is recorded. Discrete wavelengths are set and spectral signals of the spectrometer are measured for them. Based on the spectral transfer function of the spectrometer, the corresponding spectral transfer coefficients of the spectral transfer function are found for the given wavelengths. The spectral radiance of a real body is found, for which the measured spectral signals of the spectrometer are multiplied by the found spectral transfer coefficients. Then, using Planck's formula, the spectral radiance of an ideal black body is calculated. The value of the temperature included in the Planck formula is varied, and such a temperature value is found at which the calculated spectral energy brightness of an ideal absolutely black body, multiplied by the previously known spectral emissivity of a real body, best approximates the found spectral energy brightness of a real body. After that, this temperature value is taken as the actual local temperature of a real body.
EFFECT: invention increases accuracy and shortens the duration of the temperature measurement process.
1 cl, 2 dwg
