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A Multidisciplinary Approach toward CMOS Capacitive Sensor Array for Droplet Analysis.

Hamed Osouli Tabrizi¹, Saghi Forouhi¹, Tayebeh Azadmousavi²

¹Biologically Inspired Sensors and Actuators, Department of Electrical Engineering and Computer Science, Lassonde School of Engineering, York University, Toronto, ON M3J 1P3, Canada.

|February 24, 2024

Summary

This summary is machine-generated.

This study presents a new CMOS capacitive sensor method to analyze alcohol-water droplets by measuring their total time of evaporation (ToE). This technique offers a high dynamic range and resolution for chemical composition analysis.

Keywords:

CMOS capacitive sensor droplet analysis life science applications time of evaporation

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Alcohol-water mixtures are crucial in various industrial applications.
Accurate real-time analysis of liquid composition is essential.
Existing sensing methods may lack dynamic range or resolution.

Purpose of the Study:

To introduce and validate a novel CMOS capacitive sensing method for alcohol-water droplet analysis.
To measure the total time of evaporation (ToE) of alcohol-water droplets.
To address parasitic capacitance issues in capacitive sensors.

Main Methods:

Utilizing a CMOS capacitive sensor to monitor alcohol-water droplets.
Controlled thermal behavior of droplets to measure total time of evaporation (ToE).
Testing binary mixtures of water with ethanol or methanol (0-100% concentrations).

Main Results:

The capacitive sensor effectively measures both ToE and dielectric properties.
Higher dynamic range and resolution were achieved by measuring ToE compared to dielectric properties.
An electrode array successfully monitored droplet-sensor interactions.

Conclusions:

CMOS capacitive sensing is a beneficial method for accurate ToE measurement.
The proposed method demonstrates potential for analyzing liquid mixtures.
Solutions for parasitic capacitance in large-area sensors were discussed.