DIELECTRIC SUBSTANCE LEVEL MEASURING DEVICE Russian patent published in 2012 - IPC G01F23/26 

FIELD: electricity.

SUBSTANCE: invention includes two bridge circuits; each of the above circuits contains groups of capacitance level sensors, which form adjacent arms of bridge circuit, frequency generator connected through the first and the second outputs to diagonal of bridge circuit, two adders, two synchronous detectors, two filters and computing unit. Besides, to the device there introduced is the second bridge circuit containing measuring and calibration capacitance level sensors of filling in adjacent arms. As phase-detecting elements there used are synchronous detectors connected by means of signal inputs to outputs of the first and the second adders respectively, and by means of reference inputs to the third output of frequency generator, and by means of outputs to inputs of the first and the second filters respectively. The first inputs of adders are connected to output of bridge circuit. The second inputs of adders are connected to the first and the second outputs of frequency generator respectively. Outputs of filters are connected to inputs of computing unit the output of which is the output of the device.

EFFECT: improving measuring accuracy, simplifying the design and enlarging functional capabilities due to calibration of output signal.

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