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A Circular Touch Mode Capacitive Rainfall Sensor: Analytical Solution and Numerical Design and Calibration.

Xiao-Ting He^1,2, Jun-Song Ran¹, Ji Wu¹

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

Sensors (Basel, Switzerland)

|October 16, 2024

Summary

This summary is machine-generated.

This study presents an analytical solution for circular capacitive rainfall sensors operating in touch mode. This advancement enables precise numerical design and calibration for improved accuracy and reduced stress in touch mode operation.

Keywords:

analytical solution capacitive sensor large deflection numerical calibration rainfall measurement

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Area of Science:

Sensor technology
Fluid-structure interaction
Capacitive sensing

Background:

Circular capacitive rainfall sensors can operate in non-touch or touch modes.
Accurate design and calibration require predicting electrode plate deflection under rainwater.
Previous work addressed non-touch mode fluid-structure interaction.

Purpose of the Study:

To obtain the analytical solution for fluid-structure interaction in touch mode operation.
To illustrate the numerical design and calibration of circular touch mode capacitive rainfall sensors.
To compare touch mode and non-touch mode operation characteristics.

Main Methods:

Analytical solution for fluid-structure interaction after electrode contact.
Numerical design and calibration of touch mode sensors.
Comparison of capacitance, rainwater volume, and membrane stress between modes.

Main Results:

The analytical solution for touch mode fluid-structure interaction was obtained.
Touch mode operation shows significantly larger total capacitance and rainwater volume.
Touch mode operation exhibits substantially lower average membrane stress per unit rainwater volume.

Conclusions:

The analytical solution for touch mode operation is crucial for sensor design and calibration.
Circular touch mode capacitive rainfall sensors offer superior performance characteristics.
This work provides the first illustration of numerical design and calibration for touch mode sensors.