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ENG4000 Monitoring Capacitance Changes over Various Materials and Fluids

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

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ENG4000 Monitoring Capacitance Changes over 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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