Research And Implementation Of The Cardiopulmonary Detection System Based On Electromagnetic Induction

With the development of modern medicine,due to cardiovascular disease and respiratory disease induced death still accounts for a large proportion,so detecting the heart and lung signal with people in the daily life is very necessary.Traditional cardiopulmonary signal detection methods are mostly contact,which brings great inconvenience to people's normal life.Therefore,non-contact detection method which can provide a comfortable environment for the caregiver becomes the focus of the research.Non-contact cardiopulmonary signal detection based on electromagnetic induction,because of its safety and noninvasive,real-time continuous monitoring has attracted the attention of scholars at home and abroad.It has important research value and application prospects.First of all,reviewing the status of cardiopulmonary signal detection at home and abroad based on a large number of literature reading.Then,based on the basic principle of electromagnetic induction detection,the detection scheme is proposed,and the feasibility of the scheme is studied.The coupling part---coil sensor is designed and researched.Through theoretical simulation and salt solution experiment,determine the parameters of the coil starting from the performance of the coil.And COMSOL 3D model simulation used to determine the coil placement.According to the measurement scheme,a cardiopulmonary signal detection system is designed and manufactured.The whole system includes hardware and software.The hardware includes the power section,measuring the front-end circuit,amplifying filter circuit,shaping circuit and the main controller circuit.In the software part,including the system initialization,frequency counting and liquid crystal display.Hardware circuit completes the main signal detection and processing.The software part mainly completes the signal acquisition display.At the end of this thesis,through a series of experiments on the system performance and measurement results were analyzed.The changes of cardiopulmonary signal were obtained in different conditions of sitting and standing with different states,including normal breathing,deep breathing and pause breathing,and the results are consistent with BIOPAC-MP36 and PPG,and it is consistent with BCG signal.In this paper,the cardiopulmonary signal is simply separated.The original signal is transformed by FFT which obtained the respiratory rate and the heart rate,and the heart rate at apnea is consistent with it.Experimental results show that the system can accurately measure the respiratory rate and heart rate,with good veracity and reliability,and further research value.Finally,possible improvements are proposed based on the future development of cardiopulmonary signal measurements and the inadequacies of the system.