Shielding system for capacitance type fuel quantity gauge

Details Shielding system for capacitance type fuel quantity gauge Shielding system for capacitance type fuel quantity gauge

1979-12-27

1981-08-04

Goldberg, Gerald

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

G01F 2326

Patent

active

042815428

ABSTRACT:
A capacitance type fuel quantity gauge for an aircraft fuel tank including a probe capacitor whose capacitance varies in accordance with the level of fuel in the tank with a Lo-Z oscillator connected to the probe capacitor together with a pair of diodes for producing a DC output signal which is fed to signal processing circuitry, the diodes being disposed in a metal enclosure for isolation from interfering signals and the interconnecting leads to the diodes passing through feedthrough capacitors to block the entry of such interfering signals into the metal enclosure.

REFERENCES:
patent: 3747407 (1973-07-01), Wallman
patent: 3916689 (1975-11-01), Donnelly
patent: 4020691 (1977-05-01), Franklin

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