Research And System Design Of Biological Voltage And Current Measurement Under Electric Shock

With the development of society,the relationship between human beings and electricity is getting closer and closer.In daily life and production,electrical equipment is gradually increasing,and there are more and more cases of people injured by electric shock.In the case of electrocution,the 220 V voltage accounts for about 70% of the total electrocution voltage.At present,most of the methods used in the forensic identification of cases of death by electric shock are still the method of observing the external characteristics of the body with the naked eye,and this method cannot use a scientific and quantitative scheme to identify electric shock injuries.Aiming at the problems existing in forensic identification,this paper proposes a voltage and current measurement method for the biological tissue under electric shock from the electrical point of view according to the change of the electrical impedance of the organism under electric shock,which provides a new objective evidence for the identification of electric shock injuries.support.Firstly,the equivalent circuit model of the biological tissue under electric shock is constructed,and the voltage and current measurement method of the biological tissue under electric shock is proposed on the basis of the designed model.Tissue voltage and current measurements.In this paper,the electrical properties of a single cell are analyzed,and the RC equivalent circuit model of a single cell is obtained.In the 50 Hz application scenario of this topic,some electronic components have little effect on the electrical impedance of the overall RC circuit.By removing these electronic components,the equivalent RC circuit model of a single cell under electric shock is obtained.Biological tissue is composed of cells,and biological tissue can be regarded as the series-parallel connection of the equivalent RC circuit model of a single cell,so that biological tissue can be equivalent to the parallel and series connection of two RC elements.In the case of electric shock,the change of the electrical impedance of different biological tissues in the living body is extremely complex and rapid,and most of the current impedance analyzers on the market measure homogeneous conductors and cannot directly measure the electrical impedance of biological tissues.Measurement.Therefore,this paper characterizes the electrical impedance change of the local tissue of the organism by rapidly measuring the voltage and current value.By rapidly shocking the living body,the electrodes are used to obtain a voltage across parts of the living tissue.By rapidly shocking the living body,the electrodes are used to obtain a voltage across parts of the living tissue.The program-controlled voltage source is used to generate voltage at both ends of the biological tissue,simulating the voltage in the state of electric shock,and using the standard resistance of the current measurement loop to obtain the current value.The system design is mainly composed of hardware design and software design.The hardware part consists of excitation voltage module,signal processing circuit and main control module.The function of the excitation voltage module is to provide power for the voltage measurement circuit and the current measurement circuit;the function of the signal processing circuit is to process the measured signal;the function of the main control expansion module is to control the hardware circuit.The software part consists of the upper computer and the lower computer.The function of the upper computer is to issue instructions to the lower computer and receive parameters;the main function of the lower computer is to issue instructions to the hardware part.Using the least squares method to fit the data of the voltage and current of the organism under electric shock can quickly find the corresponding relationship between the voltage and current of the organism under electric shock.In order to verify the feasibility of this system design,debug and test each module.Several experiments were carried out on the system,and the experimental results showed that the system can provide effective data support for the identification of electric shock injuries.This solution effectively solves the problem of inability to scientifically quantitatively analyze electric shock injuries,and provides effective data support for identifying electric shock injuries.