Measurement method of temperature field of infrared radiation aluminum alloy plate based on blackbody point online calibration

Abstract

The invention provides a method for measuring the temperature field of an infrared radiation aluminum alloy plate based on blackbody point online calibration, which uses a thermocouple thermometer and an infrared thermal imager to measure the temperature of an aluminum alloy plate sprayed with a blackbody material, and obtains a temperature within the range of 325K to 625K. Emissivity of blackbody material; according to the obtained emissivity of blackbody material, the surface blackbody point and discrete point temperature measurement of the aluminum alloy plate sprayed with blackbody point is carried out, and the blackbody point is carried out based on the temperature of the blackbody point and the discrete point of the aluminum alloy surface using a regression model and the temperature field structure of the layer where the discrete points on the aluminum alloy surface are located; the correction formula is obtained according to the relationship between the temperature field of the layer where the black body point is located and the temperature field of the layer where the aluminum alloy surface discrete points are located, and the temperature field of the aluminum alloy plate is calculated using the correction formula Calibration to obtain high-precision aluminum alloy plate temperature results. The method proposed by the invention does not need to measure the emissivity of the aluminum alloy plates with different oxidation levels in advance, and can quickly and accurately realize the temperature measurement of the aluminum alloy plates.

Description

technical field [0001] The present application relates to the field of infrared radiation temperature measurement, in particular to a method for measuring the temperature field of an infrared radiation aluminum alloy plate based on black body point online calibration. Background technique [0002] Aluminum alloy is the most widely used metal material after steel. Due to its low density, high specific strength, easy processing, good corrosion resistance, excellent electrical conductivity and thermal conductivity, aluminum alloy is widely used in aviation, aerospace, The fields of automobile, navy, weapon and power electronics have broad application and development potential. Among them, temperature is one of the key factors affecting the processing quality of aluminum alloy materials. Widely used temperature measurement methods include thermocouple contact thermometry and infrared radiation non-contact thermometry. Compared with contact temperature measurement technology, i...

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Problems solved by technology

However, there are many influencing factors in the measurement site, which makes it difficult to obtain the correction function accurately, and there are many kinds of tested parts, which are affected by the emissivity. It can be seen that the application scene of the existing method is affected by many factors. If these influencing factors cannot be fully considered , the accuracy of the measured temperature will be affected to varying degrees

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