Absolute radiation heat flow meter calibration method

Abstract

The invention relates to an absolute radiation heat flow meter calibration method, and belongs to the thermal technical field. The absolute radiation heat flow meter calibration method includes: enabling a radiation heat flow meter to penetrate into a blackbody cavity of a blackbody radiation source; calculating and evaluating effective emissivity of an equivalent cavity model formed by the radiation heat flow meter and the blackbody cavity of the blackbody radiation source through Monte Carlo arithmetic; thereby using temperature value of the blackbody cavity of the blackbody radiation source to figure out standard radiation heat flow value through the Stephen-Boltzmann law, and achieving absolute calibration for the radiation heat flow meter. The absolute radiation heat flow meter calibration method comprehensively considers a wall temperature gradient of the blackbody cavity of the blackbody radiation source in computational analysis of the effective emissivity of the equivalent cavity model, and confirms the best position of the radiation heat flow meter deeply into the blackbody cavity of the blackbody radiation source so as to obtain the maximum effective emissivity of the equivalent cavity model. The absolute radiation heat flow meter calibration method is directly, small in number of middle links, small in uncertainty of measurement, and suitable for the absolute radiation heat flow meter calibration which is traceable to temperature.

Description

technical field [0001] The invention relates to a method for calibrating an absolute radiation heat flow meter, which belongs to the technical field of heat. Background technique [0002] A radiant heat flux meter is a sensor for measuring the radiant heat flux density. It can measure the radiant heat flux density received by or passing through the position. By measuring the output signal of the radiant heat flux meter, the temperature of the position at that time can be obtained. Radiative heat flux values. Radiation heat flow meters are widely used in the thermal simulation test process of aircraft manufacturing and in metallurgy, chemical industry and other industrial fields. Since the radiant heat flow meter generally works in a high-temperature and harsh environment, in order to ensure the measurement accuracy of the radiant heat flow meter, it is necessary to use the radiant heat flow meter calibration device to calibrate the radiant heat flow meter regularly. The ca...

AI Technical Summary

Problems solved by technology

The measurement uncertainty of this method is small, but the disadvantage is that there are many transfer steps, the equipment is complex and expensive, the use and maintenance are very cumbersome, and it will be limited by the absolute radiometer range

②Using the primary standard radiation heat flow meter transfer method, by ensuring that the angle coefficients of a transfer standard radiation heat flow meter in the high-temperature blackbody furnace and the flat furnace are the same, the calibration of the primary standard radiation heat flow meter is realized. In the value transfer, in order to eliminate the angle coefficient In addition to ensuring that the transfer standard radiation heat flow meter has the same geometric position as the reference heat flow meter on the flat furnace when the black body furnace is calibrated, a special design must be made on the structure of the transfer standard heat flow meter to avoid or eliminate the environment In order to get more accurate results, it is necessary to accurately measure the temperature and emissivity of the high-temperature flat furnace, and these measurements are often very difficult, so this method has many influencing factors and large measurement uncertainty

Images