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Mätning av temperatur och tryck med pulsfrekvensteknik

Folkesson, Per-Åke and Hjersing, Torsten (1969) In MSc Theses
Department of Automatic Control
Abstract
In this work we have discussed some alternatives to digitize the signals from different measurement devices. As a result of the work we have got a prototype for a digital interface as well as systems for digital representation of signals in temperature and pressure systems. <br> The report is divided into two parts, temperature and pressure measurements. <br>In this section of temperature measurements we discuss an oscillator feedback with temperature dependent resistance, NTC or PTC. This oscillator has been built up. The temperature interval is 25 degrees Celsius to 35 degrees Celsius. The accuracy of the temperature is estimated and the frequency range is registered. The accuracy of the measurements is 0.3 degrees Celsius and... (More)
In this work we have discussed some alternatives to digitize the signals from different measurement devices. As a result of the work we have got a prototype for a digital interface as well as systems for digital representation of signals in temperature and pressure systems. <br> The report is divided into two parts, temperature and pressure measurements. <br>In this section of temperature measurements we discuss an oscillator feedback with temperature dependent resistance, NTC or PTC. This oscillator has been built up. The temperature interval is 25 degrees Celsius to 35 degrees Celsius. The accuracy of the temperature is estimated and the frequency range is registered. The accuracy of the measurements is 0.3 degrees Celsius and suggestions for better solutions are presented. <br> For the digital pressure measurements we have used an electric device for differential pressure (NAF 35560). This device has an output, which is a direct current proportional to the pressure input. The device is changed in order to get a frequency, proportional to the pressure. <br>The function of the device is treated. A voltage, which depends on the pressure is taken out, and it is transferred to a voltage-frequency converter. The output controls a pulse-formed current, which is given instead of the former direct current as output. (Less)
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author
Folkesson, Per-Åke and Hjersing, Torsten
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
MSc Theses
report number
TFRT-5061
ISSN
0346-5500
language
Swedish
id
8850831
date added to LUP
2016-03-29 16:55:19
date last changed
2016-03-29 16:55:19
@misc{8850831,
  abstract     = {In this work we have discussed some alternatives to digitize the signals from different measurement devices. As a result of the work we have got a prototype for a digital interface as well as systems for digital representation of signals in temperature and pressure systems. <br> The report is divided into two parts, temperature and pressure measurements. <br>In this section of temperature measurements we discuss an oscillator feedback with temperature dependent resistance, NTC or PTC. This oscillator has been built up. The temperature interval is 25 degrees Celsius to 35 degrees Celsius. The accuracy of the temperature is estimated and the frequency range is registered. The accuracy of the measurements is 0.3 degrees Celsius and suggestions for better solutions are presented. <br> For the digital pressure measurements we have used an electric device for differential pressure (NAF 35560). This device has an output, which is a direct current proportional to the pressure input. The device is changed in order to get a frequency, proportional to the pressure. <br>The function of the device is treated. A voltage, which depends on the pressure is taken out, and it is transferred to a voltage-frequency converter. The output controls a pulse-formed current, which is given instead of the former direct current as output.},
  author       = {Folkesson, Per-Åke and Hjersing, Torsten},
  issn         = {0346-5500},
  language     = {swe},
  note         = {Student Paper},
  series       = {MSc Theses},
  title        = {Mätning av temperatur och tryck med pulsfrekvensteknik},
  year         = {1969},
}