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Title: Control Of A Complex Instrument Via Internet
Author: Frank Kaufmann, Kurt Guckelsberger
Source: 2001 Measurement Science Conference
Year Published: 2001
Abstract: To explore the possibilities of measurement via Internet, we use a rather complex polarized neutron diffractometer (POLDI) which involves 10 dc-current contollers, 6 neutron counters, 12 stepper-motors and a thermometer, as a test-bed instrument and run it with various software packages at a distance. Starting with legacy software for the virtual instrument dating from the eighties, we realized the same processes in three different ways: with LabView, VisualBasic and finally developped a LAMP-1 based tele-measurement system (LLinux, AApache server, MMySQL data base and Pphp, a script language providing dynamical html pages). As protection against intrusion and unauthorized use, a Linux based firewall is used as proxy and IP-filter, the secure socket layer allowing encryption. The virtual instrument is mapped onto an object tree, the content of which may then be distributed by a server to authorized clients, identified by their user name and IP adress. In this manner, a number of clients may be served simultaneously. The data plus other information, such as still pictures or video data, are time-stamped and written into the data base for future treatment and later reference. The system is running reliably and costs no license fees.

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