Design And Implement Of Web-based Virtual Experiment

With the development of education informalization, web education spreads rapidly. However, web experiment education is a weak part. Therefore, it is an important task to build a web virtual lab, which is not the same as the old and there is no timeand geographical limitations. This paper has presented a program based on virtual laboratory. It also gives a suggestion that using virtual instruments technologies to realize local virtual experiments' systems after anlysing methods and key technologies of virtual lab. It focuses on resolving the browser for virtual real-time spectrum analysis of the experimental operation of the operation, to establish an open laboratory to make initial attempts.Firstly, it combines computer web technologies and virtual instrumentation technologies and provides users a web-based, open laboratory environment on the base of existing hardware and software. Virtual laboratory research in the analysis of the status and problems of building on the basis of a detailed design of structural systems, the system used C/S/B structure, based on VBscript, ASP technology a platform, users need only have a basic computer and network conditions can visit any virtual laboratory. Use of programming language LabVIEW graphical development simulation, and using SQL Server DataSocket technology and the development of data handling procedures, the completion of the experimental data transmission and preservation. IP-MAC joint accreditation system introduced mechanisms to achieve shared hardware resources. It supports hardware experiment systems and distributed test system experiments and Components experiment.Secondly, the establishment of a database based on SQL Server laboratory information management system (LIMS). This system uses its dynamic Web database applications of the B/S three-tier structure, namely browsers, Web server devices, and database servers. users can achieve resource managing, data managing, equipments managing and laboratory systems managing, which ensure laboratories, clients and the external environments constitute a whole and virtual laboratory system operating automatically and developing in a good state.Virtual web laboratory experiments in education not only can save the input, and more importantly is that the institutions can improve the existing education system and raise the level of teaching institutions and the quality of teaching and promote learning autonomy, developing and enhancing the capacity of students involved and innovation. Its completion will enable colleges and universities teaching experiments to a new stage of modernization.As a new type of experiment, although not completely replace traditional experiments, it can be more flexible than traditional experiments diverse manifestations. In the part of raising the students' qualities and promoting the development of teaching techniques, it will play an important role.