Optical sensors — for long range and non-metal detection
Optical (photoelectric) sensors use a light beam. They detect any material: metal, plastic, cardboard. Range up to 30 m.
Three types
| Type | Range | Use |
|---|---|---|
| Retro-reflective | 0.1-15 m | Conveyors, gates |
| Diffuse | 0.01-2 m | Counting, presence |
| Through-beam | 0.1-30 m | Long range |
FAQ
For conveyor?
Retro-reflective with reflector.
Transparent glass?
Through-beam — yes.
Cost?
Diffuse $15-50, retro $25-80, through-beam $60-200.
Dust protection?
Air purge or IP69K.
vs Laser?
Laser — narrow beam for precise positioning.
Summary
Optical sensors. Comparison: proximity sensors.
