Sick sensors – classification and working methods of photoelectric sensors

Create Date: 2024-8-30 12:03:23|Source: SICK/Sick

(1) Fork photoelectric sensor

An optical transmitter and a receiver are mounted face to face on both sides of a trough to form a trough photoelectric. The luminaire emits infrared or visible light, and the light receiver receives the light in an unobstructed condition. However, when the detected object passes through the slot, the light is blocked, and the photoelectric switch acts, outputs a switch control signal, cuts off or turns on the load current, and completes a control action. The detection distance of the slot switch is generally only a few centimeters due to the limitation of the overall structure.

(2) Thru-beam photoelectric sensor, if the luminaire and the receiver are separated, the detection distance can be increased, and a luminaire and a receiver form a through-beam separate photoelectric switch, referred to as a through-beam photoelectric switch. The detection distance of through-beam photoelectric switches can reach several meters or even tens of meters. When using a through-beam photoelectric switch, the light emitter and the light collector are respectively installed on both sides of the path through which the detector passes, and when the detector passes through, the light path is blocked, and the light collector outputs a switch control signal for the action.

(3) Reflector type photoelectric switch

The luminaire and the receiver are installed in the same device, a reflector is installed in the front, and the photoelectric control function is completed by using the reflection principle, which is called the reflector reflection (or mirror reflective) photoelectric switch. Under normal circumstances, the light emitted by the luminaire is reflected back by the reflector and received by the receiver; Once the detected object blocks the optical path and the receiver cannot receive light, the photoelectric switch will act and output a switch control signal.

(4) Diffusion reflection photoelectric switch

The diffusion-reflective photoelectric switch is also equipped with a luminaire and a light collector in the detection head, but there is no reflector in front of the diffusion-reflective photoelectric switch. Under normal circumstances, the light emitted by the luminaire cannot be found by the receiver. During the detection, when the detection object passes through the light block, and the light part is reflected back, the receiver receives the light signal and outputs a switching signal.

Sick sensors – classification and working methods of photoelectric sensors

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