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Dipole transducer enhancement from a passive resonator
John L Butler1, Alexander L Butler1, Victoria Curtis1
1Image Acoustics, Incorporated, Cohasset, Massachusetts 02025.
The Journal of the Acoustical Society of America
|November 7, 2014
Summary
A passive resonator enhances low-frequency dipole transducer performance by leveraging near-field acoustics. This method significantly improves system response and achieves a nearly omni-directional beam pattern.
Area of Science:
- Acoustics
- Transducer Technology
- Wave Physics
Background:
- Dipole transducers exhibit limited low-frequency performance.
- Near-field analysis reveals dipole transducers share low-frequency dependence with monopoles.
- Passive resonator models offer potential for acoustic enhancement.
Purpose of the Study:
- To present a passive resonator model for improving dipole transducer low-frequency output.
- To investigate the excitation mechanism of a passive resonator by a dipole transducer.
- To demonstrate the modification of dipole transducer beam patterns.
Main Methods:
- Utilizing a spherical wave function model for passive resonator analysis.
- Modeling the near-field acoustic response of dipole transducers.
- Simulating the interaction between a dipole transducer and a monopole passive resonator.
Main Results:
- The passive resonator model effectively enhances low-frequency performance.
- Dipole transducers can strongly excite monopole passive resonators due to similar on-axis low-frequency dependence.
- The system demonstrates significant response modification and a shift towards an omni-directional beam pattern.
Conclusions:
- Passive resonator loading is a viable method for enhancing dipole transducer low-frequency performance.
- The interaction mechanism is well-described by spherical wave functions.
- This approach offers a pathway to achieving broader directivity in acoustic systems.
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