Based On Web Remote Virtual Instrument Research And Development

With the rapid development and application in electronic measurement technology and instruments of micro-electronics technology, computer technology, software technology and network technology, new measurement theory, new measurement method, new measurement fields and new instrument architecture continually come forth and the function and effect of electronic instruments have given birth to quality change and resulted in the conception of instrument broken in many aspects. Virtual instrument had been developed in United State at the end of 1980. Virtual Instrument completely changes the style of traditional instrument construction, which is defined by manufacturers. With the rapid development of computer and network technology, Virtual Instrument successfully runs to the remote Virtual Instrument Stage.The Virtual Instrument is the soft instrument, which instead of corresponding electronic circuitry using special software, makes full use of computer hardware resource to accomplish part or entire function of traditional instruments and makes the software as kernel, which has the function of control, processing and analysis. The VI is the modularization and softwarization. The remote virtual instrument is a network expansion of virtual instrument. Remote virtual instruments enable dynamic data acquired from a remote location and control signals sent to a process running at a remote location, which is connected by a LAN /or Internet, to be monitored and /or controlled from a local PC. Remote virtual instrument technology and network technology are combined to form remote virtual instrument technology .The remote virtual instrument technology extended the Vl's application area to whole Internet /Intranet and made the signal acquire, transfer and process become a whole unit. We can share many expensive hardware resource to make the best of existing laboratory resource and facilitate remote experiment instruction carry out to resolve the experiment instruction of remote education The marriage of VI technology and Webtechnology , which is facing Internet, produces newly VI technology------the remoteVirtual Instrument technology based on the Web. Specifically, the remote virtual instrument transplants the instruments' front panel to web page and implements corresponding measurement demand through web server. This thesis focuses on the implementation method of remote Virtual Instrument based on the web.The thesis discussed the development status of remote virtual instrument in our country and others, the concept, characteristic and composing of remote virtual instrument. The thesis also expounded remote virtual instrument system in common use at present and made a all-sided comparison of them The virtual instrument system mainly involved PC bus acquisition system ,GBIP instrument control system and VXI instrument system The analysis and comparison of several Vl's developing software technology and network computing modes were made. ActiveX technology, Data socket server technology, Web Server technology and Java technology were mainly probed into The computing mode's development process was discussed in detail. This thesis also give all -around discussion of advantage and disadvantage of BIS and CIS mode and select B/S mode at last The developing tools' selection was also analyzed and we selected Nl's LabVIEW and Nacimiento software company's AppletVIEW . This thesis also gave expatiate on the LabVIEW's character, the LabVIEW program's component and AppletVIEWs application program's component and communication process of local instrument and remote instrument.By studying on the key corresponding technologies and going through the achievements made by developed country, this thesis presents an implementation scheme of remote Virtual Instrument over the Web, which concerned the implementation of local instruments and network communication based on the Web. The implementation of local instrumentation adopted Nl's LabVIEW and this thesis discussed the LabVIEW program development process at length with the e...