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Acoustical characterization of a portable pneumatic infrasound source
Martin L Barlett1, Thomas G Muir1, Charles M Slack1
1Applied Research Laboratories, The University of Texas at Austin, P.O. Box 8029, Austin, Texas 78713-8029, USA.
The Journal of the Acoustical Society of America
|December 31, 2020
Summary
A new portable infrasound source using a pneumatic siren can generate controlled low-frequency sound bursts. This device is suitable for various applications requiring a reliable infrasound generator.
Area of Science:
- Acoustics
- Physics
- Engineering
Background:
- Infrasound (0.25-10 Hz) generation requires specialized equipment.
- Controlled infrasound sources are crucial for research and calibration.
Purpose of the Study:
- To describe a portable pneumatic siren designed as a controlled infrasound source.
- To characterize the acoustical properties of this novel infrasound generator.
Main Methods:
- The pneumatic siren was designed and constructed.
- Acoustical measurements of sound pressure levels and directivity were performed.
- Received signals were processed and compared with a multipole source model.
Main Results:
- The infrasound source produces narrowband tone bursts from 0.25 Hz to 10 Hz.
- Measured sound pressure levels and horizontal directivity were documented.
- Comparisons with the multipole model validated the source's characteristics.
Conclusions:
- The portable pneumatic infrasound siren provides a controlled and known source.
- This device is applicable in fields requiring precise infrasound generation.
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