Retroreflective Sensors

A polarizing filter is utilized to eliminate false signals that may occur if a shiny target passes in front of the retro-reflective sensor. The filter enables the trouble-free detection of glossy and high reflective objects.

The clear object detection sensor is a special retroreflective mode photoelectric sensor that detects clear objects ordinary retroreflective sensors may not. Through the use of a low hysteresis circuit, the sensor detects small changes in light typical when sensing clear objects. The clear object detector used polarized filters on both the transmitter and receiver of the sensor to reduce false responses caused by reflections from the target.

This foreground suppression sensor is a retroreflective mode photoelectric that does not erroneously identify glossy targets as the reflector when they are within a certain distance. This mode is well-suited for detecting shrink-wrapped pallets, as a retroreflective mode sensor may mistake the glossy covering for a reflector and not change state. Optical apertures in front of the transmitter and receiver elements in the sensor housing produce a zone for no erroneous detection of reflective, depolarized material.

While retroreflective sensors operate with a single point light beam, retroreflective area sensors from Pepperl+Fuchs consist of several individual light beams arranged in series. This creates a wide light band and a comprehensive detection field across the relevant sensing range. Additionally, the individual light beams can be switched off individually and combined with each another.