What is Proximity Sensor - Electrical C & V

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27 March 2020

What is Proximity Sensor

Proximity Sensor

Sensors are also known as detectors that convert physical quantity into a signal. In today's time, different types of sensors have been invented for each particular task. Today's topic is our Proximity Sensor, so let's now know about it: -



                                                




What are Proximity Sensor

Proximity Sensor is that which detects anything in its Nominal Range without detecting it and expressing its presence. In short, we can also say that Proximity Sensor is that which converts the presence or movement of any object into an electrical signal.
There is another word in it that you need to know and that is Sensing Object: - Sensing Object is that which Proximity Sensor sense or Detect.


How Proximity Sensor works

When something falls within the range of the proximity sensor, it leaves the infrared beam out and monitors its reflections. When Sensor senses some kind of reflections, it confirms that there is an object around.



                                



A Proximity sensor consists of an oscillator, a ferrite core with the coil, a detector circuit, an output circuit, housing, cable and connector. The oscillator generates a Sine Wave of fixed frequency which is used to operate its coil. Coil, together with Ferrite Core, forms an electromagnetic field. When the electromagnetic field is interrupted by a metal object, the oscillator voltage is reduced in proportion to the size and distance of the object. The decrease in oscillator voltage is due to the eddy current induce in the metal. The decrease in oscillator voltage is measured by the detector circuit.


Types of Proximity Sensors

There are several types of proximity sensors that are used in material detection and many other things. The proximity sensor is of the following types: -


1. Inductive Proximity Sensors

Inductive Proximity Sensors give output signal only when a metal object falls within their sensing range. metal object such as iron, aluminum, brass, copper etc.


2. Capacitive Proximity Sensors

Capacitive Proximity Sensors can sense metal object as well as resins, liquids, powders etc. Working, material, cable longness of this sensor can vary according to noise sensitivity. Its sensing range can also vary according to temperature, sensing object, surrounding objects. Its maximum range of sensing is 25 mm.


3. Magnetic Proximity Sensors

Magnetic Proximity Sensors have no effect of electrical noise and can work on DC, AC, AC / DC. It also varies according to sensing distance - temperature, sensing object, surrounding objects, mounting distance between sensors. This type of sensor has a sensing range of up to 120 mm. This sensor is mostly used in mobile phones, tablets, security appliances.



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