Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1990-03-23
1991-06-11
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01F 2500
Patent
active
050222570
ABSTRACT:
An impulse sensor comprises a pair of planar Piezo electric elements respectively disposed on two opposite sides of a reference plane within a cavity of the container vessel on a plane adjacent to a deflective wall of the cavity, which deflective wall has a force receiving member extending therefrom in a direction parallel to the reference plane, wherein each side of the combination of the pair of planar Piezo electric elements includes a middle electrode straddling the reference plane and in common contact with the two planar Piezo electric elements, and two side electrodes respectively disposed on two opposite sides of the reference plane and respectively in contact with the pair of planar Piezo electric elements, an electronic circuit combining two electrical signals respectively supplied from two side electrodes respectively disposed on two opposite sides of the reference plane in such a way that noises are cancelled therebetween and resultant electrical signal representing impulses experienced by the force receiving member is provided; and an electromotive force supply applying an input electric pulse of known amplitude across the two middle electrodes, that generates an output electric pulse from at least one of the side electrodes, wherein the ratio of the known amplitude of input electric pulse to the amplitude of output electric pulse is used as a calibration standard in determining the magnitude of the force experienced by the force receiving member from the amplitude of the resultant electrical signal.
REFERENCES:
patent: 4022061 (1977-05-01), Schendel
patent: 4776222 (1988-10-01), Lew
patent: 4807481 (1989-02-01), Lew
patent: 4910994 (1990-03-01), Lew
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