Human Core Temperature Detection Method And System Implementation Based On Three-channel Heat Flow Model

The core temperature of human body refers to the temperature in the deep part of the human body,which is closely related to the physiological state of the human body,and is an important basic physiological parameter for medical staff to judge the physiological state of human body.It is of great significance to detect and obtain the core temperature of human body for the prevention,diagnosis and treatment of diseases.At present,mercury thermometer,infrared ear temperature gun or digital electronic thermometer are often used as the instrument of temperature measurement in hospitals,which can not meet the continuous and real-time temperature detection.In this paper,the method of measuring the body surface temperature instead of the core temperature of human body has the defects of too long temperature measurement time and easy to be disturbed by environmental air flow,which leads to the inaccurate detection.Based on the principle of three-channel heat flow,a core temperature detection system of human body is studied and realized.The main contents and results are as follows:(1)Through the analysis of the traditional thermal measurement principle based on heat flow,by increasing the heating source and increasing the number of heat transfer units,accelerating the heat balance between the probe and the human body,shortening the waiting time required to obtain the core temperature of human body,and the accuracy of the temperature measurement,a new method and system scheme of detecting the core temperature of human body based on the three-channel heat flow principle is proposed,The structure model of the temperature measuring probe is designed and its three-channel heat flow model is established.The theoretical analysis of the measurement mechanism of human core temperature based on the principle of three-channel heat flow shows that the new method can obtain the core temperature of human body more quickly and effectively,improve the accuracy of temperature measurement,and it is feasible for the detection of human brain core temperature.(2)The finite element model of temperature measuring probe is established by using COMSOL multiphysics multi physical field simulation software.Through the simulation analysis of the influence of air flow,uneven skin thickness,sensor material and probe structure parameters on the core temperature detection performance of human brain,the material and main structural parameters of the probe are optimized.The effect of active heating method on the final core temperature of human body is explored.The simulation results show that the active heating method is effective for solving the problem of no endogenous heat in the process of reaching the heat balance between the temperature probe and the human body,which leads to the slow temperature transfer and the improvement of the speed of obtaining the core temperature of human body.(3)The hardware and software of the core temperature detection system of human brain are designed by using modular design method.The hardware includes temperature information acquisition,heating unit,information processing unit of lower computer,wireless data transmission unit,power module and other functional modules;The software includes heating unit control,data filtering,human body core temperature calculation,upper computer display and other functional modules.The data acquisition,processing and display of the core temperature information of human brain are realized.(4)Finally,the test platform of human core temperature detection performance is established by using constant temperature platform,which simulates the heat flow transfer and temperature change process in the process of core temperature detection;The results are as follows: the system can obtain the core temperature of human brain in about 7 minutes,which is better than the traditional 30 minute detection system based on heat flow principle;The error of core temperature simulation detection in the range of 35℃-42℃is±Within 0.2℃;In the normal body temperature measurement at 37 ℃,the steady-state error of temperature measurement is ± 0.1 ℃;The sensitivity and accuracy of the detection system are verified.The above-mentioned system can realize the noninvasive real-time detection of the core temperature of human brain,and provide a new solution for the development of the core temperature detection in the direction of miniaturization and intelligence.