Design Of Infrared Temperature Measurement System For Human Body

Temperature is an important indicator reflecting the physical condition of the human body,and body temperature measurement is an important method for clinical diagnosis and disease screening.In recent years,infectious diseases such as SARS,influenza A,Ebola virus and new coronavirus have occurred frequently all over the world,seriously threatening global human health.In this case,in order to meet the requirements of epidemic prevention and control,in view of the fact that the previous infrared thermometers are easily affected by the environmental temperature and measurement distance during the measurement process,research and development of an environmental temperature compensation and measurement distance compensation function The high-precision human body temperature measurement system is of great significance.This paper analyzes the human body temperature measurement methods that are urgently needed in the current epidemic situation by studying the current status of body temperature measurement at home and abroad and the basic knowledge of infrared temperature measurement theory.The performance requirements and functional requirements of the human body infrared temperature measurement system are analyzed,and the human body infrared The overall design scheme of the temperature measurement system.In terms of hardware design,the STM32F103C8T6 is used to control the whole system,the MLX90614 high-precision infrared temperature sensor is selected to measure the ambient temperature and forehead temperature,the VL53L1 long-distance flight distance sensor is selected for the distance measurement,and the CC2540 Bluetooth is used for the wireless transmission selected.The temperature is displayed in real time on the LCD screen.The hardware circuit diagram and the overall circuit diagram of each module of the infrared temperature measurement system for human body are designed,and the circuit board is drawn and manufactured according to the overall circuit diagram of the system.When designing the software program,the overall program flowchart of the infrared temperature measurement system of the human body and the program of each functional module are designed,and the collected forehead temperature and the measurement distance are preprocessed.After the hardware and software design is completed,perform related temperature measurement experiments,perform multiple linear regression on the data,fit the function between ambient temperature,measurement distance,forehead temperature and oral sublingual temperature,and write in the software programming Enter the function,and finally output the oral sublingual temperature close to the core temperature of the human body.The human body infrared temperature measurement system can realize environmental temperature compensation and measurement distance compensation,and finally output the sublingual temperature close to the core temperature,can realize the temperature real-time communication with the host computer and the real-time display on the screen,and also has an alarm function.Due to its non-contact,fast response,high accuracy,and reflection of the sublingual temperature close to the core temperature,it is suitable for accurate and rapid body temperature screening in public places.