The principle of photoelectric switch

The infrared photoelectric switch belongs to the abbreviation of the photoelectric proximity switch. It uses the detected object to shield or reflect the infrared beam, and is gated by the synchronization circuit to detect the presence or absence of the object. The object is not limited to metal, and it is suitable for all objects that can reflect light. Can be detected.

The diffuse reflection photoelectric switch is a sensor that integrates a transmitter and a receiver. When a detected object passes by, it reflects a sufficient amount of light emitted by the photoelectric switch transmitter to the receiver, and the photoelectric switch generates a switch signal . When the surface of the detected object is bright or its reflectivity is extremely high, the diffuse reflection type photoelectric switch is the preferred detection mode.

The through-beam photoelectric switch includes a transmitter and a receiver that are separated from each other in structure and the optical axis is placed opposite to each other. When the detected object passes between the transmitter and the receiver and blocks light, the photoelectric switch generates a switching signal. When the detection object is opaque, the through-beam photoelectric switch is the most reliable detection mode.

Optical fiber photoelectric switches use plastic or glass optical fiber sensors to guide light, so as to realize the detection of objects not in the vicinity.