Light curtain

Light curtain

A light curtain is a device which uses an array of photoelectric sensors to detect the presence of an object. Light curtains are commonly used with industrial equipment to 1) ensure machine safety at a point of operation control, area access control, or perimeter access, or 2) detect object size in a plane. A light curtain will typically consist of a 'stick' of infrared transmitters and another 'stick' with a corresponding set of receivers. If the plane of detection between the pair is blocked an electrical safety circuit will remove power to ensure safety.

When used for industrial safety a light curtain is referred to as an electro-sensitive protective equipment and would be described in IEC 61496.

Links

* [http://www.bannerengineering.com/en-US/products/6/Machine-Safety/45/Safety-Light-Screens-Type-4 Banner Engineering Safety Light Screens]

* [http://www.ab.com/safety/prod_directory/pres_sens_safe_devices/safety_light_curtains/index.html Light Curtains from Allen-Bradley]

* [http://www.sick.de/gus/products/product_catalogs/industrial/safety_light_curtains/en.html SICK Safety Light Curtains]

* [http://www.pinnaclesystems.com/group_mgcurtains.htm Pinnacle Systems Safety Light Curtains.]


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