Clear air turbulence (CAT) is the leading cause of in-flight injuries and in severe cases can result in fatalities. The purpose of this work is to design and develop an infrasonic array network for early warning of clear air turbulence. The infrasonic system consists of an infrasonic three-microphone array, compact windscreens, and data management system. Past experimental efforts to detect acoustic emissions from CAT have been limited. An array of three infrasonic microphones, operating in the field at NASA Langley Research Center, on several occasions received signals interpreted as infrasonic emissions from CAT. Following comparison with current lidar and other past methods, the principle of operation, the experimental methods, and experimental data are presented for case studies and confirmed by pilot reports. The power spectral density of the received signals was found to fit a power law having an exponent of −6 to −7, which is found to be characteristics of infrasonic emissions from CAT, in contrast to findings of the past.
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March 2013
March 06 2013
Experimental investigation into infrasonic emissions from atmospheric turbulence
Qamar A. Shams;
Qamar A. Shams
a)
Mail Stop 238,
NASA Langley Research Center
, Hampton, Virginia 23681
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Allan J. Zuckerwar;
Allan J. Zuckerwar
Analytical Services and Materials,
107 Research Drive
, Hampton, Virginia 23666-1340
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Cecil G. Burkett;
Cecil G. Burkett
Analytical Services and Materials,
107 Research Drive
, Hampton, Virginia 23666-1340
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George R. Weistroffer;
George R. Weistroffer
Analytical Services and Materials,
107 Research Drive
, Hampton, Virginia 23666-1340
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Derek R. Hugo
Derek R. Hugo
Rochester Institute of Technology
, 1 Lomb Memorial Drive, Rochester, New York 14623-5603
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Qamar A. Shams
a)
Allan J. Zuckerwar
Cecil G. Burkett
George R. Weistroffer
Derek R. Hugo
Mail Stop 238,
NASA Langley Research Center
, Hampton, Virginia 23681a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 133, 1269–1280 (2013)
Article history
Received:
January 18 2012
Accepted:
December 26 2012
Citation
Qamar A. Shams, Allan J. Zuckerwar, Cecil G. Burkett, George R. Weistroffer, Derek R. Hugo; Experimental investigation into infrasonic emissions from atmospheric turbulence. J. Acoust. Soc. Am. 1 March 2013; 133 (3): 1269–1280. https://doi.org/10.1121/1.4776180
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