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Area of Science:

  • Acoustics
  • Materials Science
  • Geophysics

Background:

  • Infrasound waves travel long distances, valuable for monitoring natural and anthropogenic events like volcanic eruptions and nuclear explosions.
  • Conventional infrasound monitoring relies on pressure sensors, which lack directionality, necessitating large sensor arrays for source localization.
  • Large infrasound arrays are often impractical due to space, power, and deployment constraints in diverse environments.

Purpose of the Study:

  • To present the theoretical foundation for a compact infrasound direction of arrival sensor.
  • To introduce a novel sensor design utilizing acoustic metamaterials.
  • To enable efficient infrasound source localization in previously challenging locations.

Main Methods:

  • Development of theoretical principles for a compact infrasound sensor.
  • Design of a sensor leveraging acoustic metamaterial properties.
  • Evaluation of the sensor's capability to determine infrasound direction of arrival.

Main Results:

  • The proposed sensor achieves direction of arrival determination.
  • The sensor's footprint is significantly smaller, orders of magnitude less than traditional arrays.
  • This compact design enhances deployment feasibility in restricted areas.

Conclusions:

  • Acoustic metamaterials provide a viable basis for compact infrasound directionality sensors.
  • The developed sensor design overcomes limitations of conventional large-aperture arrays.
  • Further research is recommended to explore advanced applications and refine the technology.