Employed a differential column capacitor, a novel tilt angle sensor is developed for level detection and tilt angle measurement. The tilt angle sensor is composed of a set of differential column capacitor which uses 2-half cylindrical surfaces as both fixed electrodes and mercury in the column hermetic chamber as a motion electrode. The capacitance of the 2 differential capacitors changes inversely when tilt angle is varied. A capacitance digital converter AD7150 is employed to acquire digital value from capacitance analog value. And then, the data are processed by a microprocessor to obtain the relation between the differential capacitance and tilt angle. The theory and experiment show that there are good linearity, wide range, and better precision. The error is less than ±0.30°. The tilt angle sensor is insensitive to common temperature.
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