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Sensors
Proximity Sensors
SSSSPX
A proximity sensor is a device used to detect objects or signals that are nearby without coming into physical contact with the sensor itself.
What is a proximity sensor?
A proximity sensor is a device that detects the presence or proximity of nearby objects without the need for physical contact. These sensors use various methods to detect the presence of objects, such as infrared light, ultrasound, electromagnetic fields, or capacitance.
What types of proximity sensors exist?
There are various types of proximity sensors, such as infrared detectors, ultrasonic detectors, position switches, capacitive detectors, inductive detectors, photoelectric detectors, among others.
Infrared (IR) proximity sensors: They use infrared light emitters and receivers to detect the presence of an object. When the object is within the detection range, it blocks the emitted infrared light, which activates the sensor.
Ultrasonic proximity sensors: They use high-frequency sound waves to determine the distance to an object. The sensor emits pulses in the ultrasound band, that is, it emits pulses above 20,000 Hz, and measures the time it takes to receive the reflected echoes. Based on the travel time of the ultrasonic waves, the sensor calculates the distance to the object.
Capacitive proximity sensors: They detect changes in electrical capacitance caused by the presence of a nearby object. These sensors are sensitive to changes in the electric field and can detect non-metallic objects, such as plastic or glass.
Inductive proximity sensors: They work by detecting changes in the magnetic field near the sensor. When a metal object enters the sensor's magnetic field, it alters the flow of the magnetic field, which activates the sensor.