How do Light Curtains and Light Grids work?

How do Light Curtains and Light Grids work?

Both Light Curtains and Light Grids utilize optical transmitter and receiver units. Beams of infrared light are sent to the receiver from the transmitters. When a light beam is interrupted, a dual stop signal is given to the dangerous machines inside the light curtain/grid protected area.

What is the difference between a Light curtain and a Light Grid?

A Light Curtain has several beams that are placed closely together, while a Light Grid consists of only one, two, three or four light beams.

The beams are closest on a Light Curtain that is used for finger detection, with a resolution of 14mm. Light Curtain beams are at their widest spacing when used for thigh detection, with a resolution of 90mm.

For Light Grids the beams are normally placed at a relative distance of 300 to 500mm.