LabVIEW Virtual Experiment System Based On Identity Authentication

For colleges and universities,experimental teaching occupies a very important position in practice teaching.However,the traditional experimental teaching method has many shortcomings.First of all,most of the experimental equipment is expensive and it will cost a lot of money to buy it.At the same time,it means that the number of experimental equipment will never meet the needs of students,so the openness of the laboratory is very low.Secondly,as the experimental equipment belongs to the common equipment,so in the damage maintenance is also a huge problem.Experimental equipment is not being updated fast enough to keep up with science.In this paper,based on the current situation of experiments and the existing virtual experiment system in colleges and universities,it is found that the common virtual experiment system generally does not achieve identity authentication,and cannot be saved and loaded into experimental parameters and generate individual experiment reports based on students personal identity,which is not convenient to use.Therefore,this paper uses various techniques of virtual instrument.The establishment of the virtual experiment system is studied and analyzed from the aspects of the development environment of the virtual experiment system,the identity authentication of the users of the virtual experiment,and the theoretical basis for the realization of the virtual experiment.Using Lab VIEW software as the design platform,as well as the graphical programming language,through the analysis of the functions of the virtual experiment system,the modular design idea is adopted to design and realize the virtual experiment system based on the identity authentication function,which can save and load experimental data and automatically generate experimental reports.In this paper,the virtual experimental system is divided into three modules according to its function by adopting the modular design idea.The three modules are account management module,experimental system module and data management module.The account management module uses the Access database established by Microsoft Access to save the data of the account,uses the database operation VI in Lab VIEW to operate the account data of the Access database,and realizes the login and management functions of the virtual experimental system account.The experimental module develops and implements a series of simulation virtual experiments.Combining with the knowledge of "signal and system",the modulation and demodulation experiment,low-pass filter experiment and signal decomposition experiment are designed,and the circuit acquisition experiment is designed based on the NI data acquisition card.The data management module has developed the function of managing the data of the experimental system,and designed and realized the function of generating the experimental report,saving the experimental parameters and reading the experimental parameters,so as to facilitate the users of the virtual experimental system to conduct experimental operations and reduce the time spent outside the experimental operations.