Our Bulletin 42BT Long-range Background Suppression Sensors come in a robust, compact package. Two adjustable sensing ranges are available in separate models for both 1 m (3.3 ft) or 2 m (6.6 ft) maximum sensing distances. These sensors are ideal for mounting on a conveyor line or vibratory bowl feeder. Long range background suppression diffuse sensing mode Adjustable range settings Slim flatpack housing designHighly visible status IndicatorsPico QD and 2 m (6.6 ft) cable
versions Both NPN and PNP outputsShort-circuit protected output sFast 2 ms response time
The background suppression sensor is a diffused mode photoelectric that uses separate sensing elements to detect objects close together without detecting the background material. Its sensing range for black is just 5% less than its range for white targets, and it can operate at a variable distance. Diffused with background suppression: Diffused sensors with background suppression sensors have a defined sensing range for any object regardless of color, reflectivity or finish. They are able to detect dark objects placed directly on shiny backgrounds and can be easily installed and adjusted.
The basic principal behind background suppression is triangulation. An LED transmits light through a lens in a straight line toward the target. The target reflects light back to the receiver lens and elements (E1 and E2 in figure 3) at some angle.
