Method for measuring emissivity of infrared temperature measurement target body

Abstract

The invention relates to a method for measuring the emissivity of an infrared temperature measurement target body, which includes the following steps: (1), selecting an infrared radiation thermometer; (2) selecting a high-temperature tubular furnace; (3), selecting a temperature measurement standard equipment; (4), extracting and fabricating a sample of the object to be measured; (5), putting the sample of the object to be measured in the high-temperature tubular furnace; (6), keeping the infrared radiation thermometer coaxial with the sample of the object to be measured; (7), adjusting the distance for temperature measurement of the infrared radiation thermometer; (8), arranging a visor provided with an open pore between the sample of the object to be measured and the infrared radiation thermometer; (9), aiming a visual optical aiming system on the infrared radiation thermometer at the sample of the object to be measured; (10), heating the high-temperature tubular furnace and recording the standard temperature T; (12), adjusting the emissivity or gradient value of the infrared radiation thermometer and recording the emissivity or gradient value displayed after being adjusted; and (13), taking the data processing manner of 'equal precision and multiple measurements' to obtain a data set of the partial emissivities of the sample of the object to be measured within a certain temperature range. The method is simple, low in cost and easy to realize.

Description

technical field [0001] The invention relates to the technical field of instrument measurement, in particular to a method for measuring the emissivity of an infrared temperature measurement target. Background technique [0002] The emissivity (also known as emissivity, blackness coefficient, etc.) of various material surfaces is a physical quantity that characterizes the radiation performance of the material surface, and is an important thermophysical parameter. In the application of infrared radiation temperature measurement in industrial production, the measured objects are all non-black bodies. To ensure the accuracy of the infrared radiation temperature measurement system, the emissivity of the material surface within a certain temperature range must be obtained. Radiation thermometers are divided into full radiation thermometers, spectral radiation thermometers, and partial radiation thermometers. The temperature measurement process of total radiation thermometer and s...

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Problems solved by technology

Most of the emissivity tables provided in China are the total emissivity value table and spectral emissivity of materials, and there are no measurement methods and related data sets for partial emissivity; (2) The field measurement commonly used by domestic enterprises when applying infrared radiation thermometers The method of temperature thermocouple comparison to obtain the emissivity of the measured sample part: that is, the method of installing the thermocouple temperature measuring element nearby and adjusting the emissivity of the infrared thermometer to make it equal to the comparison temperature measured by the thermocouple, but this method Due to the low precision of thermocouples on the industrial site, the influence of ambient temperature drift of infrared thermometers and the lag of temperature data comparison, it is difficult to obtain accurate corrected emissivity, so that infrared thermometers can only measure "nominal temperature"

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