| Download | - View final version: Cross-spectral method of measuring acoustical intensity: correcting phase mismatch error by calibrating two microphone systems (PDF, 3.7 MiB)
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| DOI | Resolve DOI: https://doi.org/10.4224/40003605 |
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| Author | Search for: Krishnappa, G.1 |
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| Affiliation | - National Research Council of Canada. Division of Mechanical Engineering
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| Format | Text, Technical Report |
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| Physical description | 22 p. |
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| Abstract | The accuracy of measuring acoustic intensity using two closely spaced microphones is examined. The phase mismatch error is corrected by measuring the transfer function between the two microphone systems. The two measuring microphone instrumentation systems were calibrated by flush mounting the two microphones in a rigid circular plate attached to the end of a long length of circular pipe. A random noise source was mounted at the other end of the piping system. The two microphones were exposed to the same noise (phase and pressure levels) over a wide range of frequencies. The accuracy of the measurement method was verified by creating a sound field in an anechoic room with a loudspeaker and by generating plane wave propagation inside a long length of pipe with an anechoic termination. The measurement accuracies were very satisfactory. This method has the advantage of eliminating the recording and processing of two sets of data required in the circuit switching technique.
An alternative method of deriving the expression for acoustic intensity in terms of cross power spectral density from two closely spaced microphones is also shown. |
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| Publication date | 1979-10 |
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| Publisher | National Research Council Canada |
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| Series | |
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| Language | English |
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| Peer reviewed | No |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | ee2d4114-51c1-44f0-85f6-ae42b940b4a0 |
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| Record created | 2025-08-19 |
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| Record modified | 2025-11-03 |
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