Background Suppression

Background suppression is a mode of operation for certain photoelectronic reflex sensors (reflex sensor). The angle is measured between emitted and reflected light in accordance with the principle of optical triangulation. Light is reflected at different angles from the background and the object to be recognised, because they are at different distances from the receiver. Thus only the sensor’s distance to the object is decisive with regards to the switching point. After the sensor has been aligned to the object to be detected, objects which are located behind the selected working range are optically suppressed. Background Suppression, Electromechanical: For electromechanical background suppression, the receiver is mechanically aligned with an external adjusting screw such that only reflected light from the desired working range strikes the receiving diode. Background Suppression, Electronic: For electronic background suppression, light reflected by the object strikes a certain point at the receiver, e. g. a PSD or a CMOS line array. Reflected light is electronically evaluated at this particular point.