Virtual Oscilloscope Laboratory Experiment

Virtual Oscilloscope Laboratory Experiment - Introduction...

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1 Introduction The use of the Internet has been expanding exponentially and is now extensively used as a connectivity and reference tool for commercial, personal and educational purposes. In particular, the Internet provides many new learning paradigms, including distant and group learning. More recently, the technology has even extended into the realm of conducting laboratory experiments at any time from any location through the Internet. In Politecnico di Milano [1, 2], a university distance teaching system that provides lessons, seminars and tutoring has been operating for a few years. In the University of Erlangen-Nuremberg, a virtual classroom [3], which uses HTML (Hypertext Markup Language) and HTTP (Hypertext Transport Protocol) to introduce the capabilities of VHDL (Very Large Scale Integrated Hardware Description Language) tools, was constructed. In [4], the interactive and computational capabilities of Java were demonstrated through a simple matrix assembly Java applet. These virtual laboratories provide instrument simulators, which can be a powerful auxiliary didactic tool for students to have a basic idea of the instruments, their control and operation. [5] describes some remote laboratories on experiments that can be run remotely via a web interface. This type of laboratory is well suited for distance learning where students need not be physically on campus. Parameters can be set on the web, and a software interface converts these parameters to a form that is accepted by the local computer running the experiment. Atul and Molly [5] developed the software for "Second Best to Being There", a distance learning application that allows a remotely-located user to conduct experiments in the Control Engineering Laboratory at Oregon State University. This permits the experiments to be run via the WWW (World Wide Web). Access requires only a basic web browser that runs Java and is possible from most computer platforms. A robot experiment was developed for the demonstration. Bytronic Process Control unit [6], referred to as the process rig in the Process Control and Automation Laboratory at Case Western Reserve University, can be accessed remotely via the Internet. Using a web browser, the user can log on and post the
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2 parameters from a remote client to a LabVIEW (Laboratory Virtual Instrument Engineering Workbench from National Instruments [7, 8]) web server that is connected to a process rig via a PLC (Programmable Logic Control) module. The image is generated by a program and refreshed using server push technology. In this paper, we present an approach to control real instruments remotely and describe a remote oscilloscope experimentation system, VLAB, developed using this approach. LabVIEW as well as WWW techniques such as CGI (Common Gateway Interface), JavaScript and HTML were used. Users only need a graphical browser, which supports JavaScript, to conduct and monitor the experiment remotely. User-friendly interfaces have been built and a video server is being used to live broadcast what happens in the real laboratory.
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This note was uploaded on 10/30/2011 for the course MECHATRONI EN11ME2050 taught by Professor Perera during the Spring '11 term at Asian Institute of Technology.

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Virtual Oscilloscope Laboratory Experiment - Introduction...

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