The Principle Of Capacitive Proximity Sensor

Capacitive proximity sensors are mainly composed of a series of parts such as high-frequency oscillators and amplifiers. Among them, the detection surface of the sensor and the ground will form a large capacitor. At the beginning, there is no near the sensor. Any object, so its loop will present a state of oscillation, but as the object gets closer, the capacity of the capacitor will also change at this time. When the oscillation stops, the oscillation state will be converted to electricity. The signal is amplified by the amplifier and then converted into a binary signal for switching operations.