A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation, and looks for changes in the field or return signal. A proximity sensor is a device that can detect or sense the approach or presence of nearby objects and for this it does not need physical contact. There are different kinds of proximity sensors. Some of them are listed [8]: • Inductive: This type of sensor is used to detect nearby metallic objects.
A proximity Switch is a sensor able to detect the presence of nearby objects without any physical contact. For example, during a telephone call, proximity sensors play a role in detecting (and skipping) accidental touchscreen taps when mobiles are held to the ear. Proximity sensors can be used to recognise air gestures and hover-manipulations. An inductive proximity sensor is a sensing device that detects metal targets using electromagnetic energy and without contact. The sensing range of an inductive proximity sensor changes based on the type of metal being detected.
A sensor is a device that detects and responds to some type of input from the physical environment. The input can be light, heat, motion, moisture, pressure or any number of other environmental phenomena. The sensor consists of an oscillator, trigger circuit, and output switching device. As the target enters the electric field generated by the sensor, the electric field generated gets obstructed by the target resulting in a change in capacitance which results in a change in amplitude of the oscillator circuit
