Device for measuring noise in a pipe traversed by a fluid

Details Device for measuring noise in a pipe traversed by a fluid Device for measuring noise in a pipe traversed by a fluid

1998-06-08

1999-07-20

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

181 05, G01H 300

Patent

active

059258217

ABSTRACT:
For performing a noise measurement in a pipe (16) traversed by a fluid such as air, in the pipe is placed a measuring device comprising a pipe section (10) having the same cross-section and in which is formed an elongated slot (18). The slot (18) is covered with a resistive material (24) and capped by a cavity (26). The ends of the cavity form an acute angle of at the most approximately 7.degree. relative to the axis of the pipe section (10). One or more microphones (34) are installed on the cavity (26), facing the slot (18), so that its diaphragm (36) is flush with the inner face of the cavity.

REFERENCES:
patent: 5808243 (1998-09-01), Mc Cormick et al.
W. Neise: "Theoretical and experimental investigations of microphone probes for sound measurements in turbulent flow" Joirnal of Sound and Vibration, vol. 39, No. 3, Apr. 8, 1975, UK, pp. 371-400.

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