Photoelectric is a detector composed of light as the medium, which refers to the control electrical signals of various visible light, invisible light and laser light. Early photoelectric switches were based on incandescent light bulbs, but disconnections often occurred, which affected the life of the photoelectric switch, mechanical operation, and circuit structural failure. They were easily affected by external light and noise, and lacked reliability and reliability.
Today's optoelectronics use light-emitting diodes (LEDs) as the main light source, which increases the reliability and reliability of optoelectronics.
The photoelectric switch emits a light source through the shading or light transmission of the object to be detected, and generates a current or voltage that is reflected to the light-receiving crystal. After amplification, it is finally output as an ON or OFF or analog signal.
There are three types of light sources used by light-emitting diodes, namely: infrared light, red light, and green light.
Classification of Photoelectric Switches
1. Classify by detection:
- Through-type or contrast-type
- Lens reflection type or feedback reflection type
- Diffuse reflective or direct reflective
- Logo check out
- Limited reflex
2. Classification by appearance or composition:
- Graphic photoelectric switch
- Amplifier built-in photoelectric switch
- Amplifier separated photoelectric switch
- Fiber optic photoelectric switch
- U-shaped photoelectric switch
- Free power photoelectric switch
3. Classify by output:
- Non-contact output:
- DC (NPN, PNP)
- AC (SCR)
- There is contact output: mainly AC type
TPE10
光電開關 – 穿透式