Inductive Proximity Sensor

 Working principle The inductive proximity switch belongs to a position sensor with a switch output. It is composed of an LC high frequency oscillator and an amplifying processing circuit. When a metal object approaches the oscillating sensor head that can generate an electromagnetic field, eddy currents are generated inside the object. . This eddy current reacts on the proximity switch, which attenuates the oscillation ability of the proximity switch, and changes the parameters of the internal circuit, thereby identifying whether there is a metal object approaching, and then controlling the switch on or off.

The object that this proximity switch can detect must be a metal object.

The inductive proximity sensor consists of a high-frequency oscillation circuit, a detection circuit, an amplifying circuit, a shaping circuit and an output circuit. The sensitive element for detection is the detection coil, which is an integral part of the oscillation circuit. The oscillation frequency of the oscillation circuit is .

When the detection coil is energized with alternating current, an alternating magnetic field is generated around the detection coil. When a metal object approaches the detection coil, the metal object will generate eddy currents and absorb the magnetic field energy, which changes the inductance L of the detection coil. As a result, the oscillation frequency of the oscillation circuit is reduced, and the oscillation is stopped. The two states of oscillation and vibration stop are converted into switch signal output by the monitoring circuit.

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