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Working principle of photoelectric switch

2022-04-22
Working principle of diffuse reflection photoelectric switch:
Diffuse reflection type is that when the switch emits light beam, the target generates diffuse reflection. The transmitter and receiver form a single standard component. When enough combined light returns to the receiver, the switch state changes. The effective action distance is determined by the reflection ability of the target and by the surface properties and color of the target; With less assembly cost, when the switch is composed of a single element, it can usually achieve rough positioning; The background suppression function is used to adjust the measurement distance; It is sensitive to the dust on the target and the changed reflection performance of the target.
Working principle of opposed photoelectric switch:
The opposite type is a detection form in which a transmitter and a receiver are relatively configured, the light emitted by the transmitter points to the receiver, a closed optical path is formed between the transmitter and the receiver, and the light of the optical path is blocked or attenuated. This form of detection has a long working distance, but requires a transmitter and power distribution
Working principle of mirror reflection photoelectric switch:
The mirror reflection type is a detection form that integrates the transmitter and the receiver, the photoelectric switch is opposite to the angle matrix mirror, the light of the transmitter is fed back to the receiver after being reflected by the mirror, the photoelectric switch and the angle matrix mirror (multi prism) form a closed optical path, and the light of the optical path is blocked or attenuated to detect. The action distance of this detection form is shorter than that of the direct reflection type and longer than that of the direct reflection type. Only single line power distribution is required, because the adjustment of optical axis of reflector is easier than that of radiation type; The mirror is composed of a multi prism angle matrix plate or a glass-ceramic particle reflection film.
Difference between photoelectric switch and proximity switch:

The difference between photoelectric switch and proximity switch lies in the way of detecting objects. The transmitting tube of photoelectric switch emits modulated light, and the receiving tube detects whether such light is received to judge whether there are objects; The proximity switch judges the existence of objects by the induction of the detection head of its head.