A proximity sensor is an electromagnetic device to detect the presence of nearby objects without making any physical contact with the object. Proximity sensors detect without direct contact approaching objects. Depending on the material of the object different sensor technologies are recommended. Proximity sensors emits electromagnetic beam and if any objects are present nearby, the signals will be returned back. Based on this the presence of the object is known and its distance from the sensor is calculated.
There are different types sensors based on their application
and method of function. Inductive type proximity sensors are on such type of sensors
which are used to detect the metal objects without establishing any physical
contact with them. Capacitive sensors are used to detect all kinds of
materials. RTD sensors are used to
measure the temperature by correlating the resistance of the RTD element with
temperature. It is also called a temperature sensor which measures the temperature
using the principle that the resistance of a metal object changes with
temperature. Optical sensors, also known as photo-electric sensors detects the lights, changes in light frequency, deviation in the direction of lights etc.
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