Apparatus for and method of determining a capacitance

Details Apparatus for and method of determining a capacitance Apparatus for and method of determining a capacitance

1982-04-09

1984-09-11

Kreitman, Stephen A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73 611R, 324 61QS, G01F 2326

Patent

active

044703007

ABSTRACT:
An apparatus for determining a capacitance includes a capacitor, an oscillator, and a detector. The capacitor is partially immersed in liquid containing gasoline and alcohol in such a manner that the liquid may enter the capacitor, whereby the capacitance of the capacitor varies with the level of the liquid. The oscillator is connected to the capacitor and generates a oscillatory signal which depends on the capacitance of the capacitor and the frequency of which is set higher than a reference value dependent on the alcohol concentration in the liquid. The detector is connected to the oscillator and measures the capacitance of the capacitor according to the oscillatory signal of the oscillator to determine the level of the liquid.

REFERENCES:
patent: 3213439 (1965-10-01), Atkinson
patent: 3684952 (1972-08-01), Lundstrom
patent: 4083248 (1978-04-01), Maier
patent: 4259865 (1981-04-01), Myers
patent: 4296472 (1981-10-01), Sarkis
Graze: "Elektrische Messung nichtelektrischen Gr/o/ ssen", (1962), pp. 260-266.

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