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A synchronous demodulation technology based on sample-and-hold for eddy current sensors.

Guo Feng Zhao¹, Lei Wu¹, Zi Long Feng¹

¹Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The Review of Scientific Instruments

|December 2, 2021

Summary

This study introduces a novel sample-and-hold synchronous demodulation technology for precision sensors. The method effectively suppresses signal harmonics and enhances sensor dynamic range, simplifying circuit design.

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Area of Science:

Electrical Engineering
Sensor Technology
Signal Processing

Background:

Traditional synchronous demodulation methods face challenges in suppressing harmonic components and optimizing dynamic range in precision sensors.
Precision sensors, such as eddy current sensors, require advanced signal processing techniques for accurate measurements.

Purpose of the Study:

To propose and analyze a novel synchronous demodulation technology based on sample-and-hold for precision sensors.
To demonstrate the effectiveness of this method in suppressing harmonic distortions and improving sensor performance.

Main Methods:

Theoretical analysis of the sample-and-hold synchronous demodulation principle.
Design and testing of a high-precision eddy current displacement sensor prototype utilizing the proposed method.

Main Results:

The proposed method effectively suppresses harmonic components in the output signal.
Significant improvement in the dynamic range of precision sensors was observed.
The demodulation circuit complexity was reduced.

Conclusions:

The sample-and-hold synchronous demodulation technology offers substantial advantages for precision sensor applications.
This method presents a promising approach for enhancing sensor accuracy and simplifying hardware design.
Extensive application prospects exist for this technology in various precision sensing fields.