Classification of RF sensors

　　⑴ Slot type radio frequency sensor

　　A light emitter and a receiver are mounted face to face on both sides of a slot is a slot photoelectric. The illuminator can emit infrared light or visible light, and the light receiver can receive light without obstruction. But when the detected object passes through the slot, the light is blocked and the photoelectric switch is activated. Output a switch control signal to cut off or switch on the load current to complete a control action. The detection distance of the slot switch is generally only a few centimeters due to the limitation of the overall structure.

　　⑵ Through-beam type radio frequency sensor

　　If the light-emitting device and the light-receiving device are separated, the detection distance can be increased. The photoelectric switch composed of a light emitter and a light receiver is called a through-beam separated photoelectric switch, referred to as a through-beam photoelectric switch. Its detection distance can reach several meters or even tens of meters. When in use, the light emitter and the light receiver are respectively installed on both sides of the passing path of the detected object, and the light path is blocked when the detected object passes, and the light receiver acts to output a switch control signal.

　　⑶Reflective plate type photoelectric switch

　　The light-emitting device and the light-receiving device are installed in the same device, a reflector is installed in front of it, and the photoelectric control function is completed by the principle of reflection, which is called the reflector reflection type (or mirror reflection type) photoelectric switch. Under normal circumstances, the light emitted by the illuminator is reflected by the reflector and received by the light receiver; once the light path is blocked by the detection object and the light receiver cannot receive light, the photoelectric switch will act and output a switch control signal.

　　⑷Diffuse reflection type photoelectric switch

　　There is also a light emitter and a light receiver in the detection head, but there is no reflector in the front. Under normal circumstances, the light receiver from the illuminator cannot be found. When the detection object passes through and blocks the light and reflects part of the light back, the receiver receives the light signal and outputs a switch signal.

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