Microphone probe for acoustic measurement in turbulent flow

Details Microphone probe for acoustic measurement in turbulent flow Microphone probe for acoustic measurement in turbulent flow

H - Electricity

04

R

349/39

H04R 23/00 (2006.01) G10K 11/00 (2006.01) H04R 1/08 (2006.01) H04R 3/00 (2006.01)

Patent

CA 1321637

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 the downstream end of the tube. The tube is provid- ed with a plurality of small ports, or alternately a slit, that extend a substantial portion of the length of the tube and an acoustically resistive material is stretched across the ports and clamped to the tube. In one form of the invention, the side edges of the material are connected to rigid bars and the bars are drawn together by a plurality of threaded fasteners to stretch the material over the ports. The threaded adjustment of the fasteners provides a means for vary- ing the acoustical resistance of the material. In a second form of the invention, the bars to which the side edges of the material are attached, are clamped together by spring clips.

576192

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