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A micro-machined source transducer for a parametric array in air.

Haksue Lee¹, Daesil Kang, Wonkyu Moon

¹Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk, South Korea.

The Journal of the Acoustical Society of America

|April 10, 2009

Summary

Micro-machined ultrasonic transducers offer an efficient solution for parametric arrays in air, reducing power needs. These piezoelectric arrays show promise as effective primary wave projectors for directional sound systems.

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Area of Science:

Acoustics
Transducer technology
Nonlinear acoustics

Background:

Parametric arrays in air typically require large radiators for high-intensity primary beams.
Conventional transducers have low electroacoustic efficiency in air due to high mechanical impedance, demanding significant electrical power.

Purpose of the Study:

To investigate the feasibility of using micro-machined ultrasonic transducers (MUTs) as efficient finite-amplitude wave projectors.
To evaluate MUT arrays for parametric array applications in air.

Main Methods:

Design and fabrication of a piezoelectric MUT array using lead zirconate titanate uni-morph elements.
Theoretical modeling and experimental measurements of primary and difference frequency waves.
Analysis of beam patterns and propagation curves.

Main Results:

The fabricated MUT array demonstrated potential as an efficient source transducer for parametric arrays.
Experimental results for beam patterns and propagation were reasonably explained by ideal parametric array models.
The study confirmed the viability of MUTs for generating high-intensity primary beams.

Conclusions:

Micro-machined ultrasonic transducer arrays are a feasible and efficient alternative for primary wave projection in air-based parametric arrays.
This technology can potentially reduce the power requirements for directional acoustic systems.
Further research can explore advanced designs for enhanced performance.