In general, a photoelectric switch is composed of three parts: a transmitter, a receiver and a detection circuit. The transmitter is aimed at the target and emits a light beam. The emitted light beam generally comes from semiconductor light sources, light emitting diodes (LEDs), laser diodes and infrared emitting diodes. The beam is fired continuously or with varying pulse widths. The receiver consists of a photodiode, a phototransistor, and a photocell. In front of the receiver, optical elements such as lenses and apertures are installed. Behind it is the detection circuit, which filters out the valid signal and applies it. In addition, there are emitting plates and optical fibers in the structural elements of the photoelectric switch.

At the same time, photoelectric switches have been used for level detection, liquid level control, product counting, width discrimination, speed detection, fixed-length shearing, hole recognition, signal delay, automatic door sensing, color mark detection, punching and Shearing machines and safety protection and many other fields. Moreover, using the concealment of infrared rays, it can also be used as a burglar alarm in banks, warehouses, shops, offices and other occasions where it is required.

The commonly used infrared photoelectric switch uses the principle of reflection of the object to the near-infrared beam, and the synchronous circuit senses the intensity of the reflected light to detect the existence of the object. The photoelectric sensor first emits the infrared beam to reach or pass through. The object or mirror reflects the infrared beam, and the photoelectric sensor receives the reflected beam, and judges the existence of the object according to the intensity of the beam. There are also many types of infrared photoelectric switches. Generally speaking, there are several main types, such as retro-reflective photoelectric switches, diffuse reflection types, slot types, through-beam types, and optical fiber types. The automatic selection of photoelectric switches is included in the quick and easy selection.

Different photoelectric switches are used in different occasions, for example, optical fiber photoelectric switches are often used in electromagnetic vibration feeders, diffuse reflection photoelectric switches are often used in the supply of packaging films in intermittent packaging machines, and continuous high-speed packaging machines are used. Slot-type photoelectric switches are often used in
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