METHOD AND APPARATUS FOR REPRODUCING AND TRANSMITTING A TEMPERATURE UNIT AT HIGH TEMPERATURES Russian patent published in 2020 - IPC G01K15/00 G01J5/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment - radiation-laser thermometry, can be used in metrology of high-temperature measurements and is intended for reproduction and transmitting a unit of thermodynamic temperature (kelvin) according to its new international definition, based on the relationship of temperature with fundamental physical constants. According to the disclosed solution, a beam of monochromatic radiation of a given cross-section is formed with a given surface density of the radiation flux uniformly distributed therefrom. Radiation flux density is measured in a given cross-section, the emission spectrum of the absolutely black body is determined and, using Planck's formula, the thermodynamic temperature of the absolutely black body is calculated, which is equivalent to the measured surface density of the monochromatic radiation flux. Preset monochromatic radiation flux density is measured by means of measurement. A calculated value of the thermodynamic temperature is attributed to the measured signal of the measuring device. Device implementing said method comprises in series optically connected monochromatic laser with beam splitter and feedback device, laser beam expander, iris diaphragm, photometric ball, a first calibrated diaphragm, a band-pass optical filter and a attenuating neutral optical filter, to which a second calibrated diaphragm with a trap detector or a radiation thermometer with a lens is optically connected in turn. Laser power and wavelength, expansion ratio of laser beam expander, aperture of iris, first and second calibrated diaphragms, transmission spectrum of the band-pass optical filter and attenuation of the neutral optical filter are previously found by calculation and are given based on a given range of the reproduced temperature.

EFFECT: enlarging achieved range of reproduction and transfer of temperature unit to high temperatures area with simultaneous preservation of accuracy achieved in moderate temperatures, as well as simplification of composition, reduction of prime cost and power consumption of device implementing the method.

2 cl, 5 dwg