Realization of Temperature Measurement by Passive Terahertz Imaging

摘要

Temperature measurement is one of the keys to the normalization of prevention and control of COVID-19 in crowded places. However, there are still some shortcomings in the accuracy, real-time and safety of the current temperature measurement system. This paper aims to discuss the possibility of realizing a high-precision temperature measurement system based on the existing long-distance, real-time, passive terahertz imaging system: 1). The process of transmitting and converting terahertz energy radiated by a target with a certain temperature in the form of light, heat and electricity can be analyzed by using multi-physical field coupling models. The temperature measurement mathematical model of the terahertz imaging system can then be obtained; 2). The factors of measurement distance, atmospheric transmission and system radiation on the temperature measurement results can be considered, where the temperature models are established and converted into temperature coefficients respectively to compensate the measurement results and increase the temperature accuracy; 3). Based on the reference emitter correction algorithm and scene correction algorithm, the parameters of terahertz imaging channels can be adjusted and the system output image can be non-uniform corrected. By solving the key scientific issues like temperature calibration of image chroma values, temperature compensation under multi-factors, non-uniform correction of output images, it is possible to realize a high-precision, real-time and long-distance passive body temperature measurement system suitable for crowded places. We would like to obtain some frontier, key theoretical and innovative research results, and lay solid foundation and reserves key technology for the temperature measurement application of terahertz imaging system in crowded places.