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Aeroacoustic probe design for microphone to reduce flow-induced self-noiseA new aerodynamic microphone forebody design was tested in the National Full-scale Aerodynamics Complex (NFAC) at NASA Ames Research Center. An overview of the design theory is presented. The new microphone forebody was tested along with the industry standard Bruel and Kjaer (B&K) aerodynamic microphone forebody in the Ames 7- by 10-Foot Wind Tunnel, NFAC 40- by 80-Foot Wind Tunnel and Anechoic Chamber. The wind tunnel results show that high frequency tones, present with the B&K microphone forebody, are eliminated with the new probe. Broad band background noise levels at lower frequencies are also shown to decrease with the 1/4 inch version of the new probe. Finally, the Anechoic Chamber results show no difference in the directional characteristics between the new and B&K microphone forebodies below 80 kHz.
Document ID
19950028564
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Allew, Cristopher S.
(Sterling Federal Systems, Moffett Field, CA United States)
Soderman, Paul T.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
October 25, 1993
Subject Category
Research And Support Facilities (Air)
Report/Patent Number
AIAA PAPER 93-4343
Accession Number
95A60163
Distribution Limits
Public
Copyright
Other

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