Laser Area Scanners
Laser area scanners consist of a conical mirror and a rapidly rotating laser, which monitor a large area to detect movement or a presence within that area. Laser area scanners can perform many of the same functions as a light curtain, but the area that they monitor is much more flexible. Laser area scanners can be programmed to shape the area that they monitor to a very precise degree, allowing for monitoring of an area even if there is fixed hardware that would normally trigger their presence sensing. However despite the convenience of this programmability, the human potential for error in their programming means that laser area scanners are not considered as reliable as light curtains, and therefore are not suitable for SIL 3 environments.