Low frequency acoustic fuel sensor

Details Low frequency acoustic fuel sensor Low frequency acoustic fuel sensor

G - Physics

01

F

G01F 22/00 (2006.01) G01F 17/00 (2006.01) G01F 23/296 (2006.01)

Patent

CA 2046110

LOW FREQUENCY ACOUSTIC FUEL SENSOR ABSTRACT OF THE DISCLOSURE 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 con- tainer 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 deter- mine the resonant frequency of the air cavity within the container. The volume of the air cavity is then deter- mined 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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