Rigid foraminous microphone probe for acoustic measurement in tu

Details Rigid foraminous microphone probe for acoustic measurement in tu Rigid foraminous microphone probe for acoustic measurement in tu

1988-03-24

1990-02-20

Tudor, Harold J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

381 71, 381155, H04R 2300

Patent

active

049032496

ABSTRACT:
A microphone probe for acoustic measurement in turbulent flow. The probe includes a tube having a closed end facing upstream with respect to the direction of sound propagation and a microphone is located in a downstream end of the tube. At least a portion of the length of the tube is composed of a rigid foraminous material containing a multiplicity of interconnected cells with the average cell size being less than 100 microns. In operation sound pressure fluctuations cause pressure waves to propagate through the cells to the inside of the tube and the sound pressure waves add constructively to create a high pressure sound at the microphone, while turbulent flow pressure fluctuations are essentially averaged out.

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"Noise-Con 87", Pennsylvania State University, Jun. 8-10, 1987 Experimental Investigation for Detection of Sound-Pressure Level by a Microphone in an Airstream, Journal of the Acoustical Society of America, vol. 50, pp. 40-46, 1972.
"Theoretical and Experimental Investigations of Microphone Probes For Sound Measurements in Turbulent Flow", W. Neise, Journal of Sound and Vibration (1975) pp. 371-400.
"Measuring Microphones, Studio Microphones, Hydrophones and Accessory Equipment", UA 0436, Group 3.
Porex Porous Plastics Materials, Porex Technologies.
Porex Porous Plastic Products, Porex Technologies.
Porex S40C Porous Plastic Tubes, Porex Technologies.

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