Acoustic device for measuring volume difference

Measuring and testing – Volumetric content measuring

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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.

REFERENCES:
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patent: 4112738 (1978-09-01), Turner
patent: 4474061 (1984-10-01), Parker
patent: 4561298 (1985-12-01), Pond
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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