Measuring and testing – Specific gravity or density of liquid or solid
Patent
1993-11-19
1995-04-04
Goldstein, Herbert
Measuring and testing
Specific gravity or density of liquid or solid
177210FP, G01N 900
Patent
active
054026709
ABSTRACT:
An apparatus measures the mass of a tube and liquid contained in the tube. A stiff beam is fixed at one end and connected to the tube with a magnet thereon. An electric circuit generates a current pulse which vibrates the beam and tube and induces a natural response therein. Movement of the magnet on the beam induces a current in the circuit with the induced current having a frequency of oscillation equivalent to the natural frequency of vibration of the tube and liquid in the tube. The electric circuit includes a comparator and a counter, with the comparator receiving the current induced by movement of the magnet and supplying a pulse signal to the counter having a period equal to the period of oscillation of the beam and the tube. The counter triggers the generation of an additional current pulse after a predetermined number of cycles of the induced current are counted. The current pulses are generated at a frequency lower than the frequency of the natural vibratory response of the beam and the tube. The frequency of oscillation of the induced current is measured and the mass of the tube and liquid contained in the tube is computed as a function of the measured frequency of oscillation and the stiffness of the beam.
REFERENCES:
patent: 2943476 (1960-07-01), Bernstein
patent: 4158395 (1979-06-01), Brown
patent: 4838084 (1989-06-01), Leopold et al.
patent: 4848139 (1989-07-01), Blake-Coleman et al.
patent: 4856604 (1989-08-01), Sisson et al.
patent: 4912962 (1990-04-01), Kawaguchi
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