Plane capacitance sensor and method for detecting environmental change of motorcar glass
A capacitive sensor and windshield technology, which is applied in the fields of material capacitance, vehicle cleaning, vehicle maintenance, etc., can solve the problems of inability to measure the thickness of rainwater, poor adaptability, and small measurement area, so as to avoid misoperation of wipers and reduce Adverse effects, avoid the effect of slow reaction
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[0075] Before describing the present invention in detail, briefly describe the prior art and the working principle of the present invention:
[0076] The traditional capacitive sensor is based on parallel plate capacitance. Its principle is: if the edge effect of the non-uniform electric field is not considered, the capacitance composed of two parallel plates has a capacitance of
[0077] C=ε·S / d
[0078] In the formula, ε is the dielectric constant of the medium between the plates, ε=ε0·εr, ε0 is the dielectric constant in vacuum, ε0=8.854·10 -12 F / m, εr is the dielectric constant of the medium relative to vacuum, the relative dielectric constant of air εr≈1, and other media εr>1; S is the area of the plate; d is the distance between the plates.
[0079] Due to the change of the measured medium, the relevant parameters of the capacitive sensor ε, S, and d change, so that the capacitance C changes accordingly. Accordingly, the traditional capacitive sensor can be divided i...
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