제어로봇시스템학회:학술대회논문집

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Small Capacitance Measuring Circuit For Capacitive Sensors

  • Rerkratn, Apinai (Electronics Research Center, Faculty of Engineering) ;
  • Lertpakdee, Thanakorn (Department of Electronics, Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang) ;
  • Chitsakul, Kitiphol (Department of Electronics, Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang) ;
  • Sangworasil, Manas (Department of Electronics, Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang)
  • Published : 2003.10.22
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Abstract

This paper presents a small capacitance measuring circuit for capacitive sensors. The proposed circuit consists of sinewave generator, detector and demodulator. Results of experiments are shown that the circuit can be able to measure small capacitance exiting in a capacitive sensor filled with a vegetable oil. The sensitivity of the circuit is from 0.4V/pF to 4V/pF and the resolution is from 0.0025 pF to 0.00025 pF.

Keywords