What is the working principle of inductive proximity sensor?

Inductive Proximity Sensors detect magnetic loss due to eddy currents that are generated on a conductive surface by an external magnetic field. An AC magnetic field is generated on the detection coil, and changes in the impedance due to eddy currents generated on a metallic object are detected.

What is the difference between inductive and capacitive proximity sensors?

Inductive proximity sensors are used for non-contact detection of metallic objects. Where Capacitive Proximity Sensors are used for non-contact detection of both metallic and nonmetallic objects such as liquid, plastic, paper and more.

What type of field is used in an inductive proximity sensor?

Inductive proximity sensors are used for non-contact detection of metallic objects. Their operating principle is based on a coil and oscillator that creates an electromagnetic field in the close surroundings of the sensing surface.

What is proximity sensor and how it works?

“Proximity Sensor” includes all sensors that perform non-contact detection in comparison to sensors, such as limit switches, that detect objects by physically contacting them. Proximity Sensors convert information on the movement or presence of an object into an electrical signal.

What is the sensing distance of an inductive sensor?

Inductive proximity sensors enable the detection, without contact, of metal objects at distances of up to 60 mm.

What are the different types of inductive sensors?

Inductive Proximity Sensors are roughly classified into the following three types according to the operating principle: the high-frequency oscillation type using electromagnetic induction, the magnetic type using a magnet, and the capacitance type using the change in capacitance.

Where are capacitive proximity sensors used?

Industrial sensors − such as the capacitive proximity sensor − are used for measuring an object’s position, displacement, or proximity. They are commonly employed in a range of manufacturing plant control applications.

How are inductive sensors used to measure speed?

The sensor contains a coil that is wrapped around a magnet which cause a change in the magnetic current (flux) and the coil as the teeth of a gear pass the sensor. The moving gear creates a varying flux that induces a proportional voltage in the coil of which the frequency is related to the rotation speed.

When a metal object enters the high frequency field of an inductive proximity sensor it causes?

Internally, an oscillator creates a high frequency electromagnetic field (RF) which is radiated from the coil and out from the sensor face (See Figure 1). When a metal object enters this field, eddy currents are induced into the object.

Where are proximity sensors used?

Proximity sensors are used in phones, recycling plants, self-driving cars, anti-aircraft systems, and assembly lines. There are many types of proximity sensors, and they each sense targets in distinct ways.

What is proximity switch used for?

A proximity switch is used to determine how close an object is, or the proximity of an object. The proximity of an object is determined by using certain means such as magnetic, electric, or optical. So these switches can be used to check the presence of an object.