Densitometer

Details Densitometer Densitometer

1983-10-17

1985-10-15

Levy, Stewart J.

Measuring and testing

Specific gravity or density of liquid or solid

G01N 900

Patent

active

045466416

ABSTRACT:
A vibration densitometer including a synchronous detector, a threshold detector, an integrator, an electromagnetic bridge driver, a piezoelectric crystal pick-off, a voltage controlled oscillator (VCO), a phase detector responsive to the crystal output and that of the VCO to control the VCO frequency and/or phase to provide an output signal of a frequency to energize the driver.

REFERENCES:
patent: 3776024 (1973-12-01), Schlatter
patent: 3795136 (1974-03-01), Schlatter
patent: 3805174 (1974-04-01), Schlatter
patent: 3842655 (1974-10-01), Schlatter
patent: 3878374 (1975-04-01), Schlatter
patent: 3883811 (1975-05-01), Schlatter
patent: 3906198 (1975-09-01), November
patent: 4037459 (1977-07-01), Schlatter
patent: 4151743 (1979-05-01), Ghahramani
patent: 4274016 (1981-06-01), Ghahramani

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