Pressure measuring device

Details Pressure measuring device Pressure measuring device

1984-10-16

1986-08-12

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Null balance type

73702, 73724, 331 65, 331138, 324 61R, G01L 912

Patent

active

046048987

ABSTRACT:
A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical deformation of a wall under the effect of the pressure to be measured. It uses a single coaxial cable for connecting the sensor to the user circuit and the sensor, through the coaxial cable, is placed in the leg of an impedance bridge providing the value of the standing wave rate characteristic of the difference between the tuning frequency of the cavity and the frequency of an oscillator controlled by this rate.

REFERENCES:
patent: 3343417 (1967-09-01), Peek, Jr.
patent: 3545275 (1970-12-01), Harrison et al.
patent: 3821659 (1974-06-01), Ludwig
patent: 3883796 (1975-05-01), Holt et al.
patent: 3927369 (1975-12-01), Billeter et al.
patent: 4006430 (1977-02-01), Meyer-Ebrecht
patent: 4111058 (1978-09-01), Gross
patent: 4149423 (1979-04-01), Frosch
patent: 4228393 (1980-10-01), Pile

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