Autonics The principle of proximity sensor

Proximity sensor is a general term for sensors that replace contact detection methods such as limit switches and perform detection without touching the detection object. The movement information and existence information of the detected object are converted into electrical signals. The detection methods that are converted to electrical signals include the method that uses eddy currents generated in the metal body of the detection target caused by electromagnetic induction, the method that captures the change in the capacity of the electrical signal caused by the proximity of the sensing body, the method of sharp stone and the guide switch. .

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Through the influence of the external magnetic field, the magnetic loss caused by the eddy current generated on the surface of the conductor is detected. A method in which an AC magnetic field is generated in the detection coil, and the impedance change caused by the eddy current generated by the metal body of the detection body is detected.

In addition, as another method, it also includes an aluminum detection sensor that detects frequency and phase components, and an all-metal sensor that detects only the impedance change component through a working coil.

On the surface of the detection body and the sensor, the state of the transformer occurs.