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Measurements of the performance of an acoustical calibration duct

โœ Scribed by S.A. Watkins

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
408 KB
Volume
45
Category
Article
ISSN
0003-682X

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โœฆ Synopsis

This note details an investigation of the performance of an acoustical duct used for the calibration of devices such as microphones, sound level meters and sound intensity probes at frequencies less than 250 Hz. The accuracy of the plane wave field produced in the duct was examined by measuring the standing wave ratio in the duct and the soundpressure level variation across a cross-section of the duct. The results suggest that the duct should only be used to compare pressure responses of acoustical measuring devices of similar physical dimensions.

Standards often require the response of devices such as microphones, sound level meters, and sound intensity probes, to be measured with a

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