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Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics

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Transducer for mechanical impedance testing over a wide frequency range through active feedback.

Michael Wiertlewski¹, Vincent Hayward

¹CEA LIST, Sensory and Ambient Interfaces Laboratory, Fontenay-Aux-Roses, France. michael.wiertlewski@cea.fr

The Review of Scientific Instruments

|March 3, 2012

Summary

A novel active mechanical probe offers precise impedance measurements across a broad frequency range. This technology accurately determines the mechanical impedance of biological tissues, such as a human fingertip.

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Area of Science:

Biomechanics
Mechanical Engineering
Instrumentation

Background:

Accurate measurement of mechanical impedance is crucial for understanding tissue properties.
Existing methods may lack precision or a wide frequency response.

Purpose of the Study:

To introduce a feedback-controlled active mechanical probe.
To enable precise measurement of mechanical impedance over a wide frequency range.

Main Methods:

Development of a feedback-controlled active mechanical probe.
Utilizing quasi-resonance to transform the probe into a force source.
Exciting an unknown load to measure its impedance components.

Main Results:

The probe achieves very low mechanical impedance uniformly over a wide frequency range.
Precise determination of both real and imaginary components of load impedance.
Successful application to measure fingertip mechanical impedance.

Conclusions:

The developed probe is a valuable tool for precise mechanical impedance characterization.
This technology can be applied to biological tissues and other unknown loads.
Enables detailed analysis of material properties through impedance spectroscopy.