Method for calibrating thermal infrared imager pixel point

Abstract

The invention discloses a method for calibrating a thermal infrared imager pixel point. The method comprises black-body radiation calibration and baffle temperature measurement. The mapping relation of the voltage V and temperature T of infrared imaging can be measured through the black-body radiation calibration. An n value which influences the thermal infrared imager pixel point temperature measurement accuracy is determined through deducing a baffle measured value and calculated value calculation formula for a plurality of times, and accordingly, the thermal infrared imager temperature measurement accuracy is increased. The method has the following advantages that 1, a baffle device temperature measurement method is adopted, the precision of n in a thermal infrared imaging temperature measurement formula is effectively improved, and accordingly, the thermal infrared imaging temperature measurement accuracy is improved; 2, the thermal infrared imaging temperature measurement unevenness can be effectively improved through accurately correcting each pixel of an infrared detector; 3, the baffle emissivity influence on an experiment result is not taken into consideration during the measurement experiment; and 4, the temperature influence on the experiment result is not taken into consideration during the measurement experiment.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal imaging temperature measurement. The invention relates to analyzing factors affecting temperature measurement accuracy through research on infrared thermal imaging temperature measurement data, and proposing a method for correcting the accuracy of temperature measurement results. Background technique [0002] Temperature is one of the most important parameters to determine the state of matter, and its measurement and control play a very important role in national defense, military affairs, scientific experiments, and industrial and agricultural production. In particular, pyrometry plays an extremely important role in aerospace, materials, energy, metallurgy and other fields. [0003] At present, temperature measurement is mainly divided into contact type and non-contact type. Traditional temperature measurement mostly adopts contact measurement, and thermocouple and thermal resistance te...

AI Technical Summary

Problems solved by technology

Since the actual object is not a black body, the surface emissivity is not equal to 1, so sometimes the difference between the radiation temperature and the real temperature is relatively large, and the radiation temperature distribution on the surface of the object cannot reflect the real temperature distribution.

Therefore, the accuracy of the infrared thermal imaging camera is reduced, and the application of the thermal imaging camera in many infrared thermal imaging diagnostic technology fields is affected. Therefore, the principle of infrared thermal imaging temperature measurement is studied, and the general calculation formula for calculating the real temperature of the measured surface is derived. Study the emissivity, reflectivity (or absorptivity) of the surface to be measured, the influence of factors such as ambient temperature, atmospheric temperature, measurement distance, atmospheric attenuation, and infrared detectors on the temperature measurement accuracy, which is helpful for improving the accuracy of thermal imaging temperature measurement , it is of great significance to expand the application of infrared thermal imaging technology

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