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Pressure stability of about 10 Pa/h is necessary for precise measurements of the helium evaporation rate of low-loss cryostats. A pressure controller fulfilling this requirement was designed and tested. It consists of an absolute pressure sensor, an electronic fuzzy controller and a proportional electromagnetic valve. Computer simulation of the system behaviour was used for the controller tuning. The minimization of the final deviation was preferred to the reaction speed. The operational properties of the controller were verified using tests of a helium dewar. The controller was used for the development of a small helium cryopump.
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Details
- Original title: Fuzzy pressure controller for helium bath cryostats.
- Record ID : 2003-2668
- Languages: English
- Source: Cryogenics 2002. Proceedings of the 7th Cryogenics Conference
- Publication date: 2002/04/23
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Indexing
- Themes: Transport and handling of cryogenic fluids
- Keywords: Helium; Fuzzy logic; Cryotank; Cryostat; Design; Control (automatic); Pressure; Testing; Cryogenics
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