Portable apparatus for measuring acoustic impedance at the surfa

Details Portable apparatus for measuring acoustic impedance at the surfa Portable apparatus for measuring acoustic impedance at the surfa

1979-12-26

1981-12-15

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73584, G01N 2900

Patent

active

043052959

ABSTRACT:
The apparatus consists of a circular, flexible disc held at a constant distance from a curved absorbing surface by pins or flexible ribs. Sound from a loudspeaker is fed to the center of the disc and allowed to propagate radially in the space between disc and absorber. Radial arrays of microphones on the disc surface sense sound pressure amplitude and phase, from which impedance is calculated.

REFERENCES:
patent: 2981096 (1961-04-01), Carrell
patent: 3068370 (1962-12-01), McInnish
patent: 3960004 (1976-06-01), Wirt et al.
patent: 3996788 (1976-12-01), Purves
patent: 4144768 (1979-03-01), Andersson et al.

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