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Inductive sensors detect metal objects presence in the sensible area.
They aren’t influenced by non-metal materials.
An oscillating electromagnetic field is generated in the sensible area. When a metal object enters the sensitivity field, it tends to decrease the amplitude of oscillation, creating in this way a switching in the output stage.
In inductive sensors range there are version with linear output in current or in tension.
Turned into a signal proportional to the damping of the oscillator, which depends by the distance and metallic composition of the detected object.