The Design And Development Of Network-based Virtual High Frequency Electronic Circuit Laboratory

Along expanding with the speed development of the Internet technology and the speedexpanding of college, various remote educations on Internet and virtual laboratory based onInternet appear. The significance of this paper is by building a network-based virtuallaboratory to make the best use of the resource of laboratory and to increase the utilization oflaboratory resource.This paper discusses the overall structure of Web-based virtual high frequency electroniccircuit laboratory. Expatiates the function and design method of Web Server, Device Server,Remote User Software, experimental control Software. In virtual experiments, this paperintroduces details of high frequentcy amplifyier, amplitude modulation and detection,frequentcy modulation and demodulation, phase modulation and demodulation VIs ofexperiment;in measurement and analysis instrumentations, designs signal generator,oscilloscope, spectrum analyzer VIs by LabVIEW environment. This paper presents newmethods of direct demodulating frequency, direct demodulating phase and indirect modulatingphase, application of these new methods to phase modulation and demodulation VI provedthey are correct and easy to realize. Illustrates VIs' characteristics that they have rich practicalmeasuring functions, and some of them posses simulation to demonstrate understandablyangle modulation and demodulation if used triangle as modulating signal. Connectingexploited achievements;the paper summarizes general method of designing VI, technologicalessentials of exploitation, problems met and solutions. The rudimental system of the Net-basedvirtual high frequency electronic circuit laboratory has been created.By improving the corresponding methods and techniques, the system will be moresuitable for realizing distance teaching via Internet and a useful complement to the existingexperimental teaching, and improve the flexibility and adaptability of university experimentalteaching.