The coil may have a ferromagnetic core to make the magnetic field more intense and to increase the sensitivity of the device. These changes can be detected, amplified, compared to a threshold and use to switch an external circuit. A metallic object approaching the coil will alter the inductance of the coil, producing a change in frequency or a change in the current in the coil. One form of inductive sensor drives a coil with an oscillator. The temporal variations of the Magnetic Flux Φ ). The inductive sensor is based on Faraday's law of induction. 2.2 Inductive proximity sensor (proximity switch).
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