Measuring and testing – Liquid level or depth gauge
Patent
1990-07-16
1993-10-12
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
73149, G01F 1700, G01F 2328
Patent
active
052514820
ABSTRACT:
An acoustic fuel (or other liquid, powder or solid) sensor is disclosed. The sensor measures the volume of fuel in a container of known size. The air within the container is excited by an acoustic transducer. The transducer is driven by a frequency scanning source, and the frequency response of the air cavity within the container is monitored. This frequency response is then processed to determine the volume of air in the container, and the fuel volume is determined to be the total container volume less the air volume. In one embodiment, a tube connects the transducer through an orifice to the air volume, and the frequency response is observed to determine the resonant frequency of the air cavity within the container. The volume of the air cavity is then determined from the resonant frequency. The volume of the fuel is then determined from the tank volume minus the volume of the air cavity.
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Bates Kenn S.
Chang David B.
Cuchlinski Jr. William A.
Denson-Low Wanda K.
Grunebach Georgann S.
Gudmestad Terje
Hughes Aircraft Company
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