Photoelectric switch is the abbreviation of photoelectric proximity switch, it is the use of the detected object to block or reflect the light beam, by synchronizing the circuit to turn on the circuit, so as to detect the presence or absence of the object. Objects are not limited to metal, all objects that reflect light (or have a blocking effect on light) can be detected. Photoelectric switch will be input current in the transmitter converted to light signals shot, the receiver and then according to the strength of the received light or the presence or absence of the target object detection. Photoelectric switch smoke alarms are common in security systems and are often used in industry to count the number of movements of a robotic arm.
Photoelectric switches have been used for level detection, liquid level control, product counting, width discrimination, speed detection, fixed-length shear, hole identification, signal delay, automatic door sensing, color-coded detection, punching and shearing machines and security and many other fields. In addition, the use of infrared hidden, but also in banks, warehouses, stores, offices and other needs of the occasion as a burglar alarm.
Commonly used infrared photoelectric switch, is the use of objects on the near infrared beam of reflection principle, by synchronizing the circuit to sense the strength of the light reflected back to detect the presence or absence of objects to achieve the function, the photoelectric sensor first sends out infrared beams of light to reach or through the objects or mirrors to infrared beams of reflection, photoelectric sensors to receive the reflected back to the beam, based on the strength of the beam to determine the existence of the object. Infrared photoelectric switch type is also very much, generally speaking, there is a mirror reflective photoelectric switch, diffuse reflective, slot, counter-reflective, fiber-optic and several other major types. Photoelectric switch fast easy superior automation selection have included.
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