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Related Experiment Video

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Studying Cavitation Enhanced Therapy

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A parallel-architecture parametric equalizer for air-coupled capacitive ultrasonic transducers.

Sean G McSweeney¹, William M D Wright

¹Department of Electrical and Electronic Engineering, University College Cork, Ireland.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 2, 2012

Summary

Parametric equalization enhances ultrasonic transducer systems by compensating for signal variations. This novel approach improves system performance and maintains signal fidelity for diverse applications.

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Area of Science:

Acoustics and Signal Processing
Electrical Engineering and Applied Physics

Background:

Parametric equalization is underutilized in ultrasonic transducer systems.
Variations in transducer performance and medium properties degrade signal quality.
Equalization offers a solution for non-ideal responses and field calibration.

Purpose of the Study:

To develop a flexible parametric equalizer for ultrasonic applications.
To compensate for non-ideal transducer responses and medium variations.
To enable device-by-device compensation and field calibration.

Main Methods:

Implemented a novel parallel arrangement of bi-quadratic filter elements.
Utilized switched-capacitor infinite impulse response band-pass filters on a programmable system-on-chip (PSOC).
Employed particle swarm optimization (PSO) to determine interdependent switched-capacitor coefficients.

Main Results:

Successfully equalized air-coupled capacitive ultrasonic transducer responses to idealized models.
Achieved excellent agreement between equalized signals and theoretical models.
Significantly improved system bandwidth and center frequency response, maintaining time-domain fidelity.

Conclusions:

The developed parametric equalizer effectively compensates for non-ideal ultrasonic system responses.
The equalizer can be applied to either the transmitter or receiver, and corrects for misalignment.
This technology offers significant improvements in ultrasonic system performance and calibration.