Capacitive pressure sensor with heated electrodes

Measuring and testing – Fluid pressure gauge – Electrical

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Details

73753, 73724, 73730, G01L 912

Patent

active

056707215

ABSTRACT:
An apparatus for measuring the pressure of a liquid in a container includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the elapsed time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference and thus, the pressure within the container.

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MC 1455 Timing Circuit, Motorola Semiconductor Technical Data, pp. 11-5 to 11-11.
SAE Technical Paper Series--910497 Feb. 25-Mar. 1, 1991 "A Capacitive Oil Deterioration Sensor".

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