System for sustaining and monitoring the oscillation of piezoele

Details System for sustaining and monitoring the oscillation of piezoele System for sustaining and monitoring the oscillation of piezoele

1987-02-10

1988-11-15

Levy, Stewart J.

Measuring and testing

Specific gravity or density of liquid or solid

73 54, 73579, G01N 900, G01N 1116

Patent

active

047839872

ABSTRACT:
The disclosed system includes a piezoelectric crystal exposed to an energy-absorptive medium of interest. A crystal oscillation circuit is included for sustaining oscillation of the crystal in contact with the fluid. To accomplish this, the circuit includes feedback elements for providing automatic gain control of the amplifier portion of the oscillator. In this manner, the conditions required for crystal oscillation are maintained independent of variations in the medium the crystal is exposed to. Information regarding the gain adjustment and oscillation frequency of the crystal are applied to a microprocessor-based system for determining fluid characteristics such as viscosity, density, and dielectric constant. Alternatively, this information is used to correct for the influence of such parameters on the resonant behavior of piezoelectric crystals undergoing mass change, in the analysis of, for example, corrosion, adsorption and electroplating. The relationship between the particular characteristics determined and the output information received from the oscillation circuit is dependent upon the hydrodynamic and electrokinetic coupling experienced between the medium and crystal.

REFERENCES:
patent: 3710614 (1973-01-01), Oppliger
patent: 4129031 (1978-12-01), Tehon et al.
patent: 4624129 (1986-11-01), Haynes

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