Acoustic Qualification of an Anechoic Chamber

Abstract

The aim of the work was to determine the working space and frequency range limits of an anechoic sound chamber for accurate measurements of source sound power and directivity. This was achieved by following guidelines in British Standard 4196 and noting the decrease of measured sound pressure levels with increasing distance from the source. Results indicated that the chamber tested in this work was suitable for measurements within 1.5 dB across a frequency range of 125 Hz to 20 kHz so long as microphones are placed sufficiently far from the source and chamber walls. The characteristics of certain source sound fields may lead to an increase in the lower limiting frequency however. Keywords: Anechoic chambers; Laboratory equipment.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1989
Accession Number
ADA217159

Entities

People

  • D. J. Hendy

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Acoustic Absorption
  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Anechoic Chambers
  • Atmospheric Attenuation
  • Attenuation
  • Boundaries
  • Electrical Equipment
  • Free Field
  • Frequency
  • Frequency Bands
  • Measurement
  • Microphones
  • Near Field
  • Sound Pressure
  • Waves

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster