Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1987-09-04
1989-03-07
Kyle, Deborah L.
Communications, electrical: acoustic wave systems and devices
Signal transducers
367174, 381 71, 381154, H04R 2300
Patent
active
048113093
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 the downstream end of the tube. The tube is provided 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 varying 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.
REFERENCES:
patent: 3444955 (1969-05-01), Hoffman
patent: 4421957 (1983-12-01), Wallace
patent: 4703506 (1987-10-01), Sakamoto et al.
"Noise & Vibration Control", Beranek, McGraw-Hill Book Company, 1971.
Journal of Sound and Vibration "The Flow Noise Level at Microphones in Flow Ducts" Neiss et al., 1979, 63(4), 561-579.
J. Acoust, Soc. Am, "Tubular Windscreen Design for Microphones for In-Duct Fan Sound Power Measurements", Wang et al., vol. 55, No. 3, Mar. 1974.
"Measuring Microphones, Studio Microphones, Hydrophones and Accessory Equipment" Group 3 UA0436.
The American Society of Mechanical Engineers, "Active Attenuation in Flow Ducts: Assessmen of Prospective Applications" Shephard et al., Dec. 1986.
Journal of Sound and Vibration "Theoretical and Experimental Investigations of Microphone Probes for Sound Measurements in Turbulent Flow" 1975, vol. 39(3), 371-400.
Journal of Sound and Vibration, "Microphone Screens for Acoustic Measurement in Turbeltn Flows", Shepherd, 1986, Co. 111(1), 153-165.
Allie Mark C.
Eriksson Larry J.
Hoops Richard H.
Eldred John W.
Kyle Deborah L.
Nelson Industries Inc.
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