Impact of microphone configuration on sonic boom recordings
Because different measurement setups can affect sonic boom recordings, this paper compares different microphone configurations employed during NASA’s Quiet Supersonic Flights 2018(QSF18) research campaign in Galveston, TX. Hardware was deployed at two geographically unique locations that reasonably...
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Published in: | The Journal of the Acoustical Society of America 2019-10, Vol.146 (4), p.2753-2753 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | Because different measurement setups can affect sonic boom recordings, this paper compares different microphone configurations employed during NASA’s Quiet Supersonic Flights 2018(QSF18) research campaign in Galveston, TX. Hardware was deployed at two geographically unique locations that reasonably represented the three different measurement approaches across QSF18. Analysis of several booms points to acoustically relevant differences in the various configurations, most likely caused by microphone height and windscreen type. An elevated microphone has measurable multipath interference effects (also observed in complementary laboratory measurements) and is subjected to increased wind. Additionally, sensors with more compact wind screens have less wind-noise rejection. The multipath effects, in particular, can cause bias errors in relevant metric calculations. Thus, this comparison is useful in the design and planning of similar, future measurements. [Work supported by NASA Langley Research Center through the National Institute of Aerospace.] |
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ISSN: | 0001-4966 1520-8524 |
DOI: | 10.1121/1.5136532 |