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A mode of operation for certain diffuse reflex photoelectric sensors. The angle is measured between transmitted 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 recognized, because they are at different distances from the receiver. Thus only the sensor’s distance to the object is decisive as regards 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.
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