The type of a device that is used in manufacturing and industrial applications is known as a proximity sensor. There is no need for proximity sensors to be physically in contact with the object being detected. There are different types of proximities. The types have their own unique advantages. This article aims to explain the advantages of each type of proximity sensors.
The inductive type is the first type of proximity sensors. This type of sensors is made up of a coil, the detector, output circuit and the oscillator. Inductive sensor is used only for detecting targets made of metal. When working, the coil in inductive proximity starts to generate high frequencies of magnetic field. After detecting a metallic object, the sensors will absorb some of its energy, which then affects the field oscillator. Once the oscillation amplitude receives a particular threshold value, the object is then detected. One benefit of this inductive proximity is that they are accurate when compared to other type of technologies. The other advantage is that inductive proximity have a high rate of switching. They are able to work in conditions that are harsh.
The capacitive is the second type of proximity sensor. The principle of capacitor is what capacitive sensor works on. Capacitive proximity is made up of the following components; the plate, threshold, output circuit and the oscillator. In capacitive proximity, the object together with the plate acts as the plates while the air as the dielectric. When the target objects comes near the plates, the capacitance increases which triggers the circuit detector. The trigger will depend on the amplitude’s output that comes from the oscillator. Targets that are metallic and non-metallic can be detected by these sensors which is a great benefit. They are cheaper but with a resolution that is high. They also have stability and power usage that is low.
The third type of sensors is the photoelectric. These sensors can detect targets that are metallic and also no-metallic. The main component is the emitter that can send light beams and the detector that is able to detect. If the object comes between the emitter and the detector, it will get detected. These sensors are used in various applications like in mobile phones. The advantage of this type of sensor is that it is of low cost and the installation can be done with ease. The sensing range is also long. Photoelectric sensors also have a fast switching traits and are used in conditions that are harsh.
The fourth proximity sensor is the ultrasonic. Ultrasonic sensors have the capabilities for emitting and receiving sound waves. Ultrasonic transmitters detect the target using ultrasonic waves. Ultrasonic sensors have different advantages. Despite the material of the object, ultrasonic sensors are able to detect different types of objects. Even in situations of diverse climate, ultrasonic sensors are able to operate efficiently.