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Monitoring Capacitance Changes in Various Materials and Fluids

Study on planar capacitors for detecting material properties using capacitive sensors, addressing limitations in current sensing technology for precise measurements and diverse applications. Methodology involves connecting planar capacitors, analyzing Cx response, and converting data digitally. Progress includes sensor shielding, better instrumentation, and calibration. Future steps include enhancing shielding, expanding tests, integrating with LabView, and minimizing noise interference.

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Monitoring Capacitance Changes in Various Materials and Fluids

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  1. ENG4000 Monitoring Capacitance Changes over Various Materials and Fluids Aysar Khalid, Hassan Chehaitli, Mohammad AryanpourGroup 5 Course Director & Advisor: Prof. E. Ghafar-Zadeh Mentor: Giancarlo Ayala-Charca, Mourad Amara

  2. Motivation • Calibrating and understanding planar capacitors • Detecting solid dry/wet material properties using planar capacitive sensors • Current sensing technology is limited in accuracy • Applications for pressure measurement, humdity sensing, impurity detection (Lubepoint et. al, 2013)

  3. Background • Capacitance sensors detect a change in capacitance when something or someone approaches or touches the sensor. • Current techniques (ESP) unable to work on low or high resistivity gases • Different particles require different techniques (Analog Devices et. al, 2006)

  4. Methodology • Planar capacitor is connected and produces Cx • Cx occurs when excitation signal (square wave) with f= 90.9 Hz • EVB then takes Cx and converts to digital signal using modulator/filter/etc. • Need to ensure minimal RF/EM interference on sensor (Analog Devices et. al, 2006)

  5. Progress Results To Date

  6. Discussion From the last presentation • Sensor shielding and grounding • Developed and used aluminum die-cast casing for shielding • Various fluids and better instrumentation • Calibration and stability

  7. Conclusion ; Next Step • Make shielding more secure • Test more fluids/materials and samples for more tests • Connect sensor with LabView setup for data logging • Noise from Laptop/measuring instrument

  8. Acknowledgements Thanks to All the People and Organizations who technically or financially supported your project

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