Digit capacitance type angular displacement sensor in mode of without brush and testing method thereof

Abstract

The invention relates to the angular displacement sensor of digital capacitance alternation without electric brush type, which comprises the mechanic and electric units. The mechanic structure comprises the sensing device of capacitance angular displacement sensor (including the launching pole board, the driving pole plate and the receiving pole plate), the revolving shaft, the bearing, the reality and the cover; the electric structure comprises the measuring components (including the selecting unit, the exiting source and the charge detecting circuit), the intelligent parts (composed of I / O unit, A / D unit, wave filtering unit and calculating unit) and the interface component. The working principle is: the revolving of the sensor rolling shaft drives the revolving of the revolving pole plate between the launching and the receiving pole plates; the input signal is the geometrical mechanical amount reflecting the angular displacement, and the changing of the mechanical amount brings about the changing of the capacitance value; the charge detecting circuit measures and obtains the voltage signal that has the linearity relation with the capacitance. The invention has good anti-interference performance.

Description

technical field [0001] The invention belongs to the technical field of angular displacement sensors, and in particular relates to a digital capacitive brushless angular displacement sensor and a detection method thereof Background technique [0002] The traditional metal tube rotameter is a purely mechanical type, which drives the pointer display or remote transmission mechanism to the remote end through electromagnetic induction coupling and mechanical linkage mechanism. With the advancement of electronic technology, the development of material science and computer technology, a capacitive angular displacement metal tube float flowmeter has appeared. The principle is to convert the change of the linear displacement of the float into the change of the angle of the external connecting rod, and the change of the angle It is converted into the change of the capacitance value, that is, the position of the float is measured by detecting the capacitance, and finally the flow is ob...

AI Technical Summary

Problems solved by technology

[0016] (4) Overcome the shortcomings of large power consumption, analog output, and single output form that restrict its wide use in metal tube rotameters.

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