Influences of Target Distance and Angle on Temperature Measurement Accuracy of Infrared Thermal Imager

An infrared thermal imager is a type of noncontact, high-efficiency, and high-precision temperature measuring equipment Because of the recent 2019-nCoV, infrared thermal imaging temperature measurement technology has rapidly developed, and it has made outstanding contributions to the timely prevention, control, screening, and isolation of people displaying symptoms such as high temperature Infrared thermal imaging temperature measurement technology is based on a calibration temperature measurement system, and its temperature measurement accuracy is affected by the radiation temperature of the measured object, ambient reflection temperature, atmospheric temperature, detector temperature, and distance between the target and the infrared thermal imager A large number of researchers have studied the influence of the distance between the target and the thermal imager on the temperature measurement results However, the influence mode lacks theoretical basis analysis, and there are differences in the influence forms and results By studying the principle behind infrared temperature measurement, deducing the theoretical formula, and establishing a measurement model, the influence of the distance and angle between the point source target or nonpoint source target and the thermal imager on the temperature measurement results is analyzed Important factors in the design process and selection of design indexes such as detector and optical lens are mentioned After developing the experimental device, the temperature measurement data were fitted and compensated, and the temperature measurement accuracy was evaluated after compensation By measuring human body temperature, with the device, for various distances, the influence of distance on the temperature measurement results was studied, and a compensation method to improve the measurement accuracy is suggested The temperature measurement results show a standard deviation of 0 14℃ The results achieved the ideal effect, and the device improved the temperature measurement accuracy and consistency © 2021, Editorial Board of Journal of Tianjin University(Science and Technology) All right reserved