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- W830490155 abstract "A comprehensive and novel system of automatic control has beendesigned and constructed using distributed intelligence techniquesto control a complex item of equipment for the measurement of linearthermal expansion over the temperature range 1.5K - 300K. The systemis designed to perform its own self-calibration automatically beforethe experiment commences.The low temperature dllatometer developed for this research projectincorporates the most sensitive length change sensor available; athree-terminal capacitance transducer. This transducer technique has been refined to resolve length changes of 10-5A and more importantly,measure length against temperature profiles to better than 10-2A.The period of time required to collect a full set of datameasurements on any particular specimen was in excess of 100 hours.Forming the heart of the automated control system is an assembly ofIntel MCS-Sl single chip microcontrollers connected together on aserial link consisting of a simple pair of wires. The approach hasbeen to divide the system automation into a number of specificcontrol tasks and to allocate a different task to each controller.The Instrument has been used as a diagnostic tool to investigate theproperties of lead glasses, and in particular to study thepossibility of negative thermal expansion existing at lowtemperatures. Thermal expansion measurements were also performed toobserve the phase change within single crystals of polydiacetyleneand to research into low temperature phenomena occurlng within thecrystal." @default.
- W830490155 created "2016-06-24" @default.
- W830490155 creator A5025533221 @default.
- W830490155 date "1990-01-01" @default.
- W830490155 modified "2023-09-27" @default.
- W830490155 title "Automation of a capacitance dilatometer using distributed control" @default.
- W830490155 hasPublicationYear "1990" @default.
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