Acoustic calibration apparatus for calibrating plethysmographic

Details Acoustic calibration apparatus for calibrating plethysmographic Acoustic calibration apparatus for calibrating plethysmographic

1994-05-11

1995-09-12

Noland, Thomas P.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01H 1700

Patent

active

054489040

ABSTRACT:
An apparatus for calibrating an acoustic sensor. The apparatus includes a transmission material having an acoustic impedance approximately matching the acoustic impedance of the actual acoustic medium existing when the acoustic sensor is applied in actual in-service conditions. An elastic container holds the transmission material. A first sensor is coupled to the container at a first location on the container and a second sensor coupled to the container at a second location on the container, the second location being different from the first location. A sound producing device is coupled to the container and transmits acoustic signals inside the container.

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