## Description As opposed to contact sensors, **proximity sensors** can detect the presence of an object without needing to touch the object. There are three kinds: - Inductive - Detects magnetic losses due to eddy currents that are generated on an external surface generated by an external magnetic field - Capacitive - Detects changes in capacitance between a sensor and an object - Magnetic ## References [Proximity Sensors - OMRON](https://www.ia.omron.com/support/guide/41/introduction.html)