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Working principle of capacitive sensor


Capacitor sensors are a sensor that converts the measured mechanical amount of measured to electrical capacity. Its sensitive part is a capacitor with variant parameters. Below, let me talk about the working principle and type of capacitive sensor.

The capacitor detection element of the capacitor sensor is based on the principle of cylindrical capacitors. The capacitor consists of two insulating the inner electrode and external electrode of the inner electrode of the two insulars. At the time, the capacity between the two cylinders is C = 2∏l/LND/D, and the L is the length of the two cylinders in the formula; D is the diameter of the outer tube electrode; D is the diameter of the inner tube electrode; The intermediate medium of the middle medium. In actual measurement, D, D, and E are basically unchanged, so capacitive sensors have the characteristics of convenient use, simple structure and high sensitivity.

Capacitor sensors can be divided into three categories: polar distance change type, area change type, and medium change type. The polar distance variable type is generally used to measure the extreme distance change caused by force, pressure, vibration, etc. The area change type is generally used to measure corner displacement or larger wire displacement. The medium variable type is often used in the measurement of the temperature, density, and humidity of various media and the temperature, density, and humidity of various media.