proximity sensor working principle: Simple explanation

Proximity Sensors convert physical quantity into a signal which is known as proximity sensors. Infrared filters are used for powering them and the have broad applications in various fields.

They detect objects near to them even if these objects have no contact among it and sensor. The signal is sent by the sensor as long the object is in the defined vicinity of the sensor. These are known as proximity sensors because they detect the motion or presence of an object electrically.

Types of proximity sensors

Many different types of proximity sensors are available and they depend on the need and the material to be detected near them. Let’s take a look:

Inductive proximity sensors

The electrical signal is produced by these sensors as soon any object approaches them or comes near to them from any direction. iron, aluminum, brass, copper and other types of metals are also detected by the inductive proximity sensors. Each of these metals can be detected at a different sensing distance.

Flat targets are preferred with the sensors. If targeting distance is larger than the sensing distance, the sensing face can increase this distance. This was introduced in the mid-’60s.

Capacitive proximity sensors

Along with detecting metals resins, powders, liquids, are also identified by these sensors. covering material, cable longness, and noise sensitivity can vary the effectiveness of these sensors. Factors like temperature, sensing object, surrounding the object and the mounting distance between the sensors can vary the sensing distance. 25mm is its maximum range of senses.

Magnetic proximity sensors

They work on magnets and do not have any kind of electrical effect which makes them work in both AC and DC modes. Factors like temperature, objects surrounding it, as well as the mounting distance between the sensors can affect the sensing distance of these sensors. They can sense up to 120mm and have the highest sensing distance. mobile phones, tablets, and security gadgets use these magnetic proximity sensors. Mobile phones become more responsible and useful with these senors.

Thus these are the major types of sensors available in the market today and how they work.

telemecanique inductive proximity switch

Schneider motion sensor

Telemecanique sensors through beam

Square D occupancy sensor

Schneider Electric proximity sensor

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