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Error analysis of a practical energy density sensor

Parkins1, Sommerfeldt, Tichy

  • 1RTH Systems, Groton, New York 13073, USA.

The Journal of the Acoustical Society of America
|August 3, 2000
PubMed
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A new, inexpensive acoustic energy density sensor was developed using six microphones on a sphere. This spherical sensor provides accurate measurements for active control systems, outperforming suspended microphone arrays.

Area of Science:

  • Acoustics
  • Sensor Technology
  • Active Noise Control

Background:

  • Acoustic energy density is crucial for understanding sound fields and developing active control systems.
  • Existing methods for measuring acoustic energy density can be complex and expensive.
  • There is a need for compact, accurate, and cost-effective sensors for acoustic analysis.

Purpose of the Study:

  • To design and analyze an inexpensive three-axes acoustic energy density sensor.
  • To compare the performance of a spherical sensor with a traditional suspended microphone array.
  • To evaluate the accuracy and practicality of the spherical sensor for active control applications.

Main Methods:

  • Developed a spherical sensor with six electret microphones on a 0.025-m radius sphere.

Related Experiment Videos

  • Conducted analytical, computer-modeled, and experimental investigations.
  • Compared bias errors of potential, kinetic, and total energy density, and intensity magnitude.
  • Tested sensor performance in traveling and standing wave fields at arbitrary incidence angles.

    • Main Results:

    • The spherical energy density sensor demonstrated higher accuracy compared to other measurements.
    • Experimental results showed the sensor is within +/- 1.75 dB of reference measurements (110-400 Hz).
    • Diffraction effects from the sphere allowed for a sensor size reduction by a factor of 3.

    Conclusions:

    • The developed spherical acoustic energy density sensor is accurate and cost-effective.
    • It offers a compact and practical solution for active noise control and acoustic field analysis.
    • The sensor's design overcomes limitations of traditional suspended microphone configurations.