Rigid foraminous microphone probe for acoustic measurement...

Details Rigid foraminous microphone probe for acoustic measurement... Rigid foraminous microphone probe for acoustic measurement...

H - Electricity

04

R

349/29

H04R 23/00 (2006.01) G01H 3/12 (2006.01)

Patent

CA 1321636

Abstract of the Disclosure A microphone probe for acoustic measurement in turbulent flow. The probe includes a tube having a closed end facing upstream with respect to the direc- tion 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 foramin- ous material containing a multiplicity of interconnect- ed 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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