Proximity sensors are used to _____.

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 2

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"Proximity Sensor" includes all sensors that perform non-contact detection.
A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal.
There are various types of Proximity Sensor. These are Inductive sensor, Capacitive sensor, Ultrasonic sensor, Photoelectric sensor, and Magnetic Sensor.
Inductive sensors are used to detect only metal objects.
Capacitive sensors are used to detect both metallic and non-metallic objects.
Ultrasonic sensors can detect objects in solid, liquid, or granular as well.
Magnetic proximity sensors are proximity devices used to detect magnetic objects through their large sensing ranges.
Proximity sensors detect objects directly in front of them by detecting the sensor’s own transmitted light reflected back from an object’s surface.