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Related Experiment Videos

Highly directional acoustic receivers.

Benjamin A Cray1, Victor M Evora, Albert H Nuttall

  • 1Naval Undersea Warfare Center Division, 1176 Howell Street, Newport, Rhode Island 02891-1708, USA. crayba@npt.nuwc.navy.mil

The Journal of the Acoustical Society of America
|March 27, 2003
PubMed
Summary
This summary is machine-generated.

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This study presents the theoretical directivity of combined acoustic receivers. Highly directional dyadic sensors offer significant directivity but may increase sensitivity to nonacoustic noise.

Area of Science:

  • Acoustics
  • Signal Processing
  • Sensor Technology

Background:

  • Combined acoustic receivers measure multiple acoustic field quantities at a single point.
  • Existing methods for analyzing sensor directivity are limited.

Purpose of the Study:

  • To theoretically determine the directivity of a single combined acoustic receiver.
  • To investigate the directivity index achievable with higher-order sensors.

Main Methods:

  • Formulation using Taylor series expansion of acoustic pressure.
  • Development of a power series expansion for sensor directivity.
  • Analysis of a second-order combined receiver (dyadic sensor).

Main Results:

  • A single combined acoustic receiver's theoretical directivity is formulated.

Related Experiment Videos

  • A highly directional dyadic sensor can achieve a directivity index up to 9.5 dB.
  • Increased directivity in sensors can lead to higher sensitivity to nonacoustic noise.

    • Conclusions:

    • The theoretical framework allows for the calculation of directivity for combined acoustic receivers.
    • Dyadic sensors offer potential for high directivity in acoustic measurements.
    • Trade-offs between directivity and noise sensitivity must be considered in sensor design.