The Design of Network-based Virtual Laboratory

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Virtual laboratory is a practical teaching assisted instruction with high efficiency. This paper analyzes the characteristics, classification of virtual laboratory and the design of virtual instrument. It discusses the construction and system structure of network-based virtual laboratory. This paper also proposes design method of hardware and software, and provides a reference for the construction of virtual laboratory. Preface The famous American national instrument company (NI), first proposed the concept of software as an instrument of virtual instrument in the mid - 1980s(1). Virtual instrument is a kind of equipment which combines the hardware resources and the actual equipment together into a whole through the application of software, and completes the data display, data analysis processing and other functions through the software. Virtual laboratory is based on the technical support of computer hardware and software to realize the virtual environment and the virtual experimental methods(2). The real experimental environment and equipment and the experimental process that the virtual experiment reproduced ,provided the experimenter very real feeling, and it is easy to use, it has high efficiency, and not be limited by time and place, etc.The application of virtual laboratory allows students the freedom to experiment and realize data sharing. For the courses in the Science and Engineering Colleges or Universities, the experimental teaching is very important. The existing experiment teaching content and method have great limitations(3). There are some problems, such as time-consuming in management, decentralization of funds, backward equipment, low utilization of the laboratory, restriction of students' practice, etc. Virtual laboratory(1) can solve the problem effectively. In recent years, virtual experiment has become a product of information technology and computer network technology, it is the important means to improve science experiment mode and method(4), and it will be very helpful to improve the quality of experiment teaching. some universities and research institutions have established a certain scale specialized virtual laboratory, and received good effect. The construction and popularization of university virtual laboratory has become an inexorable trend of the future development.