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A Theoretical Study on an Elastic Polymer Thin Film-Based Capacitive Wind-Pressure Sensor.

Xue Li1, Jun-Yi Sun1,2, Bin-Bin Shi1

  • 1School of Civil Engineering, Chongqing University, Chongqing 400045, China.

Polymers
|September 23, 2020
PubMed
Summary

A novel capacitive wind-pressure sensor utilizes an elastic polymer thin film for real-time structural monitoring in civil engineering. This design offers a larger monitoring range and faster response than traditional sensors.

Keywords:
capacitive pressure sensorclosed-form solutionparallel plate capacitorpolymer thin filmstructural wind pressure

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Real-time monitoring of structural wind pressure is crucial in civil engineering.
  • Existing sensors often have limitations in range and response speed.

Purpose of the Study:

  • To design and validate an elastic polymer thin film-based capacitive wind-pressure sensor.
  • To achieve real-time monitoring of structural wind pressure with enhanced performance.

Main Methods:

  • Developed a sensor comprising a wind-driven elastic polymer thin film, a parallel plate capacitor with a movable electrode, and a spring-driven return unit.
  • Derived and experimentally validated a closed-form solution for the contact mechanics.
  • Utilized numerical calibration based on the closed-form solution for sensor design.

Main Results:

  • The sensor's capacitance varies with the deflection of the polymer film under wind pressure.
  • The closed-form solution accurately models the sensor's behavior.
  • Numerical calibration enables the design of a nonlinear sensor with a wider pressure-monitoring range and faster response.

Conclusions:

  • The proposed capacitive sensor is a workable solution for real-time wind-pressure monitoring.
  • The closed-form solution facilitates the design of high-performance nonlinear sensors.
  • This technology offers improved capabilities over traditional linear sensors.