Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1989-01-13
1990-03-27
Raevis, Robert R.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73 3, G01F 132
Patent
active
049109944
ABSTRACT:
An impulse sensor comprises a disc shaped Piezo electric element contained within a transducer container vessel with a thin wall, from which a force receiving member extends, wherein the Piezo electric element is pressed onto the thin wall. Each side of the disc shaped Piezo electric element includes at least a pair of electrodes disposed on two opposite sides of a reference plane perpendicular to the thin wall and including the central axis of the force receiving member. The electromotive forces from first two of the four electrodes respectively located on the two opposite sides of the reference plane, which may be on the same or opposite sides of the disc shaped Piezo electric element, are combined in such a way that noise associated with forces perpendicular to the thin wall is cancelled therebetween and signals representing forces perpendicular to the reference plane and exerted on the force receiving member are obtained. The other two of the four electrodes are connected to an electric power source that intermittently applies a pulse of electromotive force across the other two electrodes, which exerts a mechanical impulse on the Piezo electric element. The ratio of the magnitude of the impulse exerted on the force receiving member to the amplitude of electrical signal from the first two electrodes generated thereby is calibrated based on the ratio of the amplitude of the pulsed electromotive force applied across the other two electrodes to the amplitude of electrical signal from the first two electrodes generated by the mechanical impulse experienced by the Piezo electric element as a result of the electromotive force applied across the other two electrodes.
REFERENCES:
patent: 4022061 (1977-05-01), Schendel
patent: 4776222 (1988-10-01), Lew
patent: 4807481 (1989-02-01), Lew
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