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Modeling of the MET Sensitive Element Conversion Factor on the Intercathode Distance.

Maksim Ryzhkov¹, Vadim Agafonov¹

¹Phystech School of Electronics, Photonics and Molecular Physics, Moscow Institute of Physics and Technology (National Research University), 141700 Dolgoprudny, Russia.

Sensors (Basel, Switzerland)

|September 12, 2020

Summary

Optimizing microelectromechanical systems (MEMS) sensor design, this study models how intercathode distance affects conversion cell sensitivity. Reducing this distance enhances frequency response uniformity and lowers power consumption in MEMS motion sensors.

Keywords:

MET sensor convection conversion factor diffusion electrochemical cell frequency response motion sensor

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Area of Science:

Engineering
Physics
Materials Science

Background:

Microelectromechanical systems (MEMS) sensors are crucial for motion parameter measurement across various scientific and technical domains.
Current practical designs of transforming cells in MEMS sensors often feature suboptimal geometries.
The impact of specific geometric parameters, such as intercathode distance, on sensor sensitivity remains inadequately explored.

Purpose of the Study:

To develop a mathematical model for analyzing the frequency-dependent behavior of the conversion coefficient in a four-electrode cell.
To investigate the influence of varying intercathode distances on the performance of MEMS sensors.
To provide practical design recommendations for improving MEMS sensor sensitivity and efficiency.

Main Methods:

Construction of a mathematical model to simulate the conversion coefficient's frequency response.
Analysis of stationary and signal currents under different intercathode distances.
Parametric study of geometric configurations in a four-electrode conversion cell.

Main Results:

A monotonic decrease in stationary current with reduced intercathode distance was observed, holding other parameters constant.
Signal current exhibited a decrease in the low-frequency region and an increase in the high-frequency range as intercathode distance was reduced.
The model successfully predicted the behavior of the conversion coefficient based on frequency and intercathode distance.

Conclusions:

Reducing the intercathode distance to the minimum technologically feasible value is recommended for practical MEMS sensor applications.
Minimizing intercathode distance leads to a more uniform frequency response across a wider range.
Optimizing intercathode distance significantly reduces the power consumption of the MEMS sensor's sensitive element.