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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Related Experiment Video

Updated: Aug 15, 2025

Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
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Wireless Capacitive Liquid-Level Detection Sensor Based on Zero-Power RFID-Sensing Architecture.

Shaheen Ahmad1, Ramin Khosravi2, Ashwin K Iyer2

  • 1Mechanical Engineering Department, University of Alberta, Edmonton, AB T6G 2R3, Canada.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary

A novel wireless liquid level sensor integrates a capacitive sensing element with a passive RFID architecture. This system achieves high sensitivity and reliable detection for various liquids without internal power, enhancing current sensor technology.

Keywords:
battery-lesscapacitive sensorgrounded coplanar waveguide (GCPW)interdigitated electrode capacitor (IDC)radio-frequency identification (RFID)sensitivityultrahigh frequency (UHF)wireless sensorzero-power sensor

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Wireless Communication

Background:

  • Traditional liquid level sensors often require internal power sources and complex circuitry.
  • Existing methods may have limitations in detecting both conductive and non-conductive liquids accurately.
  • There is a need for reliable, low-maintenance wireless sensing solutions.

Purpose of the Study:

  • To propose and validate a new wireless method for liquid level detection.
  • To integrate a capacitive Interdigitated Capacitor (IDC) sensing element with a passive Radio Frequency Identification (RFID) sensing architecture.
  • To demonstrate the sensor's capability for accurate and sensitive liquid level measurement.

Main Methods:

  • A capacitive IDC-sensing element was designed to transduce liquid level changes into capacitance variations.
  • These capacitance variations were linked to alterations in the phase of the RFID backscattered signal.
  • The system was tested in a real-world scenario, with the sensor placed up to 2 meters from the RFID reader.

Main Results:

  • The proposed sensor node demonstrated high sensitivity to liquid level variation, measuring 2.15°/mm.
  • The sensor accurately measured both conductive and non-conductive liquids due to a protective polyethylene coating.
  • Measurements were successfully performed at distances up to 7 meters from the RFID reader.

Conclusions:

  • The developed passive RFID-based sensor offers a reliable, power-free solution for wireless liquid level detection.
  • The sensor exhibits high sensitivity, linearity, repeatability, and real-time response, suitable for diverse applications.
  • This technology enhances the reliability and applicability of liquid level sensing compared to conventional methods.