A photoelectric sensor is an electronic device that uses light signals to detect the presence, distance, colour or surface properties of an object, usually consisting of a light emitter (e.g. LED or laser) and a receiver (e.g. photodiode).

Common types include:

1. Through-beam: Separate emitter and receiver to detect occlusion.

2. Reflective: The transmitter and receiver are integrated and detect light reflected from an object.

3. Diffuse: relies on the diffuse reflection of light from the surface of the object. 

4. fibre optic (Fiber Optic): optical signals are transmitted through optical fibre, suitable for long distance and narrow space.

The following is a list of some of the scenes:

1. industrial automation (assembly line counting, positioning)

2. Security (access control, anti-collision)

3. new energy (coating, stacking, core detection, etc.)

4. automotive manufacturing (stamping, painting, assembly, etc.)

5. logistics and warehousing (transfer, sorting, AGV, stacker cranes, etc.)

6. consumer electronics (sweeping robot, etc.)

Need to consider:

1. Detecting distance: opposed type＞reflective type＞diffuse reflective type.

2. Object characteristics: colour, material (transparent/opaque), surface reflectivity. 3.

3. Environmental interference: avoid strong light, dust or vibration effects.

4. Output type: NPN/PNP, digital/analogue signal.

Yes, but you need to choose a special model to avoid misjudgment caused by light transmission of ordinary sensors.

Some sensors may be affected by interference, the solution:

1. Choose products with strong anti-interference ability.

2. Use a light shield or adjust the installation angle.