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The Transformer Bridge Principle Circuit Using RF Admittance Technology.

Fanfan Liu1, Chaojie Zhang1, Wenyong Guo1

  • 1College of Power Engineering, Naval University of Engineering, Wuhan 430030, China.

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This study addresses lag stability in dirty U-shaped liquid level sensors. A novel RF admittance transformer bridge circuit effectively minimizes capacitance value fluctuations for improved measurement accuracy.

Keywords:
dirtyliquid level measurementliquid level sensorradio frequency admittance

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Measurement Science

Background:

  • Dirty U-shaped liquid level sensors exhibit lag stability issues with capacitance values during level drops.
  • Existing sensor designs may struggle with accuracy in contaminated environments.

Purpose of the Study:

  • To investigate and mitigate the lag stability problem in dirty U-shaped liquid level sensors.
  • To design and validate a new circuit for enhanced measurement accuracy.

Main Methods:

  • Analysis of the equivalent circuit of the dirty U-shaped liquid level sensor.
  • Design of a transformer bridge circuit utilizing Radio Frequency (RF) admittance technology.
  • Simulation using a single-variable control method to test measurement accuracy with varying capacitance values.

Main Results:

  • Identified optimal parameter values for dividing and regulating capacitance.
  • Simulations demonstrated excellent measurement accuracy under diverse conditions.
  • Successfully controlled changes in sensor output capacitance and attached seawater mixture length.

Conclusions:

  • The developed transformer principle bridge circuit effectively minimizes the influence of output capacitance lag stability.
  • The proposed RF admittance-based circuit offers a robust solution for accurate liquid level sensing in challenging conditions.