Infrared radiation precise temperature measuring method

Abstract

The invention discloses an infrared radiation precise temperature measuring method. The infrared radiation precise temperature measuring method comprises the following steps that: Step 1: ambient reflection temperature Tu is measured; step 2: ambient atmospheric temperature T alpha is measured through using a thermometer, and atmospheric transmittance tau alpha is calculated according to the distance between a measured object and infrared radiation temperature measuring equipment; step 3: the radiation temperature Tr of the measured object is measured through using the infrared radiation temperature measuring equipment; step 4: the emissivity epsilon n and the reflectivity Rho n of the measured object as well as the sum alpha of the emissivity and the reflectivity are determined, wherein the alpha <= 1; step 5: measurement values of T alpha, Tu and Tr are input to the infrared radiation temperature measuring equipment, such that the value I (T alpha) of an ambient atmospheric temperature signal, the value I (Tu) of an ambient reflection temperature signal and the value I (Tr) of a radiation temperature signal of the measured object are calculated, and the values are substituted into an actual object infrared temperature measuring formula which is mentioned in the description, such that the value I (T0) of the infrared radiation temperature measuring signal is calculated; and step 6: according to the calibration formula of a thermal infrared imager, conversion calculation is performed so as to obtain the authentic temperature T0 from the value I (T0) of the infrared radiation temperature measuring signal.

Description

technical field [0001] The invention belongs to the technical field of infrared radiation temperature measurement, in particular to an infrared radiation precise temperature measurement method. Background technique [0002] Due to the complex principle of infrared radiation temperature measurement and many factors affecting the accuracy of temperature measurement, many people think that the accuracy of infrared radiation temperature measurement is not high. The temperature measurement accuracy of infrared thermometers or infrared thermal imaging cameras is guaranteed by the calibration of blackbody radiation sources at close range in the laboratory. The temperature measurement accuracy of blackbody is generally 1 to 2%. However, in actual measurement, since the measured object often does not meet the black body radiation characteristics, the accuracy of infrared radiation temperature measurement will be significantly reduced, and the size of the error is related to the surfa...

AI Technical Summary

Problems solved by technology

For non-Lambertian bodies (such as metals), the sum of their surface emissivity and reflectivity to the environment is not equal to 1, and the gray body correction error is still large

Therefore, the current temperature measurement correction methods of infrared thermometers and infrared thermal imaging cameras cannot be used to accurately measure the temperature of non-Lambertian bodies such as metals. One of the reasons for the accuracy limits the application of infrared radiation temperature measurement equipment in these fields

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