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Measurement Accuracy for Qualification Testing of Anechoic and Hemi Anechoic Chambers Using the Continuous Draw Method
Technical Paper
2009-01-2151
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Anechoic/hemi-anechoic chamber qualification testing is typically conducted by measuring the free-field response as a microphone is traversed away from a central noise source toward the chamber perimeter. Based on ISO standard 3745, the microphone can be moved either incrementally or continuously. If using broad band random noise, the measurement must last a sufficient period of time to ensure an accurate averaged level is recorded. For low frequencies this can require extended periods of time. Attempting to establish a microphone traverse rate slow enough to allow sufficient time averaging becomes tedious. Over distances of 3 meters, this can require a draw that takes 20 minutes or longer. This paper discusses techniques explored to produce results that are quicker and more accurate than by typically applied methods.
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Citation
Brown, D., "Measurement Accuracy for Qualification Testing of Anechoic and Hemi Anechoic Chambers Using the Continuous Draw Method," SAE Technical Paper 2009-01-2151, 2009, https://doi.org/10.4271/2009-01-2151.Also In
References
- Standard ISO3745 second edition 2003-12-01, Acoustics-Determination of sound power levels of noise sources using sound pressure-Precision methods for anechoic and hemi-anechoic rooms.