ENG4000 Monitoring Capacitance Changes over Various Materials and Fluids
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Transcript of ENG4000 Monitoring Capacitance Changes over Various Materials and Fluids
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ENG4000Monitoring Capacitance Changes over
Various Materials and FluidsAysar Khalid, Hassan Chehaitli, Mohammad Aryanpour
Group 5
Course Director & Advisor: Prof. E. Ghafar-ZadehMentor: Giancarlo Ayala-Charca, Mourad Amara
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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)
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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)
Particle Particle Size(microns)
Dust Mites 100 - 300
Starches 3 - 100
Asbestos 0.7 - 90Anthrax 1 - 5
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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)
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Progress Results To Date
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# Sample Amount (3/10cc)
Capacitance (fF)
CAPDAC (hex / fF)
Offset Capacitance (fF)
1 Alcohol 1 unit 3984 42 / 8000.766
69.879
2 Alcohol 1 unit 3994 43 / 8000.898
-30.2331
3 Ginger Beer 1 unit 3894.134 43 / 8000.898
-9.472
4 Ginger Beer 1 unit 3623.641 43 / 8000.898
-9.102
5 Water 1 unit 3920.92 43 / 8000.898
-2.317
6 Water 1 unit 3900.99 43 / 8000.898
-2.338
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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
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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
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Acknowledgements Thanks to All the People and
Organizations who technically or financially supported your project