Pressure measurement apparatus and method

Details Pressure measurement apparatus and method Pressure measurement apparatus and method

1985-12-12

1987-02-24

Levy, Stewart J.

Measuring and testing

Fluid pressure gauge

Vibration type

73723, G01L 700

Patent

active

046447962

ABSTRACT:
Fluid density measuring apparatus and method for directly measuring fluid density or indirectly measuring pressure. The apparatus includes a bellows and a generally rigid hollow housing having openings through which fluid may flow to the interior of the housing, and a vibratory single-ended tuning fork mounted in the housing. The apparatus also includes circuitry for causing the tines of the tuning fork to resonate, for example, 180 degrees out of phase in a transverse direction, with the frequency of the tines varying with variation in the density of the fluid surrounding the tines. Circuitry is also included for determining the frequency at which the tuning fork tines resonate. When the density of the fluid into which the housing is placed changes, the frequency of vibration of the tines of the tuning fork is caused to change to provide a measure of the pressure.

REFERENCES:
patent: 3216260 (1965-11-01), Erdely
patent: 3902355 (1975-09-01), Weisser
patent: 3902365 (1975-09-01), Knauth
patent: 4126049 (1978-11-01), Cotter
patent: 4507970 (1985-04-01), Dinger

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