Classification of photoelectric sensors by structural type

Classified by structural type
Slot type photoelectric sensor
Structural features: The emitter and receiver are installed face to face on both sides of a slot.
Working principle: The light emitter can emit infrared or visible light, and the light receiver can receive the light without obstruction. But when the detected object passes through the slot, the light is blocked, and the photoelectric switch operates, outputting a switch control signal.
Application scenario: Due to the limitations of the overall structure, the detection distance of slot switches is generally only a few centimeters, which is suitable for short distance detection.
Opposite type photoelectric sensor
Structural features: The light emitter and receiver are separated and installed on both sides of the path through which the detection object passes.
Working principle: When the detection object passes through, it blocks the light path, and the receiver will activate to output a switch control signal.
Application scenario: The detection distance can reach several meters or even tens of meters, suitable for situations that require longer detection distances.
Reflective board type photoelectric switch
Structural features: The light emitter and receiver are installed in the same device, with a reflective plate installed in front.
Working principle: Under normal circumstances, the light source emitted by the emitter is reflected back by the reflector and then received by the receiver; Once the detected object blocks the light path and the receiver cannot receive light, the photoelectric switch will activate and output a switch control signal.
Application scenario: Suitable for situations where reflection principle is required for detection.
Diffuse reflection photoelectric switch
Structural features: The detection head is also equipped with a light emitter and a receiver, but there is no reflector in front.
Working principle: Under normal circumstances, the light collector emitted by the emitter cannot be found. During detection, when the object passes through, it blocks the light and partially reflects it back, and the receiver receives the light signal and outputs a switch signal.
Application scenario: Suitable for situations where it is necessary to detect reflected light from objects.