Measuring and testing – Volumetric content measuring
Patent
1997-07-23
1998-10-20
Noori, Max H.
Measuring and testing
Volumetric content measuring
G01F 1700
Patent
active
058248927
ABSTRACT:
An acoustic device for measuring volume difference between a standard object and an object to be measured comprises a reference container, a measuring container connected to the reference container via a separator, a loudspeaker provided at the separator, for cyclically provides complementary variations in volume to these two containers, microphones for detecting pressure variations inside these respective containers, and a signal processor for measuring a ratio between the magnitude of the detected pressure variation inside the reference container and the magnitude of the detected pressure variation inside the measuring container, and obtaining a difference in volume between the object to be measured and the standard object from the measured ratio when the standard object is placed into the measuring container and the measured ratio when the object to be measured is placed into the measuring container.
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patent: 4640130 (1987-02-01), Sheng et al.
patent: 4888718 (1989-12-01), Furuse
patent: 5054316 (1991-10-01), Pratt et al.
patent: 5105825 (1992-04-01), Dempster
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