Multistage turbulence shield for microphones

Details Multistage turbulence shield for microphones Multistage turbulence shield for microphones

1996-08-30

1998-09-15

Eldred, J. Woodrow

Acoustics

Miscellaneous

381 88, 381 91, 381158, 381 71, 367901, 181198, G10K 1100

Patent

active

058082433

ABSTRACT:
An acoustic sensing means such as a microphone or a thin-film sensor is located in a flowing medium. To prevent the sensing of flow generated noise, the sensing means is separated from the flowing medium by at least three stages of shielding. In a preferred embodiment, the sensing means is located within a foam shield which is located in a frame covered by a fabric shield and which is, in turn, located in a second frame covered by a second fabric shield. A spandex fabric is suitable for use in the present invention.

REFERENCES:
patent: 3550720 (1970-12-01), Ballard
patent: 4570746 (1986-02-01), Das et al.
patent: 4903249 (1990-02-01), Hoops et al.
patent: 4966252 (1990-10-01), Drever
patent: 5477506 (1995-12-01), Allen
patent: 5477564 (1995-12-01), Tichy
Theoretical and Experimental Investigations of Microphone Probes for Sound Measurements in Turbulent Flow By W. Neise, from the Journal of Sound and Vibration (1975) 39(3), 371-400.
Low-Noise Windscreen Design and Performance By Christopher W. Menge and Gonzalo Sanchez, from the "Noise-Con 94", Ft. Lauderdale, Florida, 1994 May 1-4, pp. 787-792.
Microphone Windscreens By John K. Hillard, from "Project Notes/Engineering Briefs", B. & K. Tech. Rev. (1969) pp. 426-427.
Experimental Determination of the Effectiveness of Microphone Wind Screens By John C. Bleazey, from the "Journal of the Audio Engineering Society", Jan. 1961, vol. 6, No., pp. 48-54.

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