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Design of liquid level detection circuit based on sampling probe structure capacitance.

Zeyu Ding¹, Wei Gong²

¹Department of Computer, Changzhi University, Changzhi, Shanxi, China.

|April 18, 2024

Summary

This study introduces a novel liquid level detection system for medical instruments. The variable capacitance-based system offers high sensitivity and accuracy, improving test result reliability.

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Area of Science:

Biomedical Engineering
Instrumentation and Measurement

Background:

Automatic clinical medical testing instruments rely on accurate liquid level detection.
Conventional methods suffer from low accuracy, sensitivity, and false detection issues, impacting test results.

Purpose of the Study:

To develop a high-sensitivity liquid level detection system for clinical medical testing instruments.
To overcome the limitations of traditional liquid level detection techniques.

Main Methods:

A variable capacitance-based detection system utilizing a phase-locked loop (PLL) circuit.
Employing a combination of slope and amplitude detection for signal judgment.
Using a double tube probe integrated into the voltage-controlled oscillator's tuning capacitor.

Main Results:

The system demonstrates accurate detection, high sensitivity, and stable, reliable operation.
Exhibits good dynamic response for both large and small liquid volumes.
Achieves simpler structure and lower cost compared to machine vision, ultrasonic, or optical methods.

Conclusions:

The proposed liquid level detection system enhances accuracy and reliability in medical testing.
Its design prevents issues like collision, carryover contamination, and empty suction.
Offers a cost-effective and robust solution for automated clinical instruments.