Method and means for measuring sound intensity

Details Method and means for measuring sound intensity Method and means for measuring sound intensity

1985-04-30

1987-04-07

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73648, 73655, 367178, G01N 2900

Patent

active

046550860

ABSTRACT:
Sound intensity is determined by simultaneously measuring instantaneous acoustic pressure and instantaneous particle velocity at a single point. A condenser microphone having a vibrating diaphragm generates an output voltage proportional to the instantaneous acoustic pressure. A laser Doppler vibrometer measures the velocity of the vibrating diaphragm and a Doppler frequency tracker converts the velocity measurement into another output voltage which is proportional to the instantaneous acoustic particle velocity. The sound intensity is then calculated from the known components.

REFERENCES:
patent: 3364813 (1968-01-01), McKinney
patent: 3435656 (1969-04-01), Jordan et al.
patent: 4125025 (1978-11-01), Suzuki
patent: 4236040 (1980-11-01), Chung
patent: 4422167 (1983-12-01), Shajenko
patent: 4463453 (1984-07-01), Cohen et al.
patent: 4466738 (1984-08-01), Huang et al.

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