1. Diffuse reflective photoelectric switch
Diffuse reflection photoelectric switch is a kind of sensor which integrates transmitter and receiver. When there is a detected object passing by, enough light emitted by the photoelectric switch transmitter will be reflected to the receiver, and then the photoelectric switch will generate a switch signal. When the surface of the detected object is bright or its reflection rate is very high, diffuse reflection photoelectric switch is the preferred detection mode.
2. Mirror reflective photoelectric switch
The mirror reflection photoelectric switch is also a combination of transmitter and receiver. The light from the photoelectric switch transmitter passes through the mirror and is reflected back to the receiver. When the detected object passes through and completely blocks the light, the photoelectric switch generates a detection switch signal.
3. Opposite photoelectric switch
The opposite photoelectric switch consists of a transmitter and a receiver which are structurally separated from each other and whose optical axis is placed opposite to each other. The light emitted by the transmitter enters the receiver directly. When the detected object passes between the transmitter and the receiver and blocks the light, the photoelectric switch generates a switch signal. When the detected object is opaque, the opposite photoelectric switch is the most reliable detection mode.
4. Slot type photoelectric switch
The slot type photoelectric switch is usually a standard U-shaped structure. Its transmitter and receiver are located on both sides of the U-shaped groove respectively, and form an optical axis. When the detected object passes through the U-shaped groove and blocks the optical axis, the photoelectric switch generates the detected switching signal. The slot type photoelectric switch is safe and reliable for detecting high-speed changes and distinguishing transparent and translucent objects.
5. Optical fiber photoelectricity
The optical fiber switch uses plastic or glass optical fiber sensor to guide the light, so as to realize the detection of the detected object not in the near area. Generally, the optical fiber sensors are divided into two types: the opposite type and the diffuse type.