Fluid transducer

Details Fluid transducer Fluid transducer

1988-03-10

1990-05-08

Chapman, John

Measuring and testing

Specific gravity or density of liquid or solid

73 54, G01N 934, G01N 1116

Patent

active

049227459

ABSTRACT:
A transducer for measuring a parameter of a fluid, such as density or viscosity, comprises two generally parallel tines extending from a common yoke, forming a tuning fork adapted to be immersed in the fluid. The tines are excited to vibrate resonantly and in anti-phase by one or more piezo-electric exciting elements, which are housed in one or more cavities within the tines or the yoke. The vibrations are sensed by one or more similarly-housed piezo-electric sensing elements. The tines are shaped to enhance their sensitivity to the parameter to be measured: for example they are provided with re-entrant surfaces to enhance density sensitivity, or elongated in the direction in which they vibrate to enhance viscosity sensitivity.

REFERENCES:
patent: 3420092 (1969-01-01), Dorsch
patent: 3902365 (1975-09-01), Knauth
patent: 4217774 (1980-08-01), Agar
patent: 4558588 (1985-12-01), Beaudoin et al.
patent: 4679427 (1987-07-01), Kanda et al.
R. M. Langdon, "Vibratory Process Control Transducers," Marconi Review, vol. 43, No. 218 (Third Quarter 1980), pp. 156-175.

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