Electronic distance sensor using optical phase difference

摘要

The damping filter (9) is so inclined compared to the main axis of the radiation path (6A), that an irregular radiation component reflected at it does not fall on the detector (2). The filter is arranged between the radiation source (1) and the reflector (5). The filter is an independent element. A shutter (8) with two slits (8a, 8b) permeable for the radiation is provided, also a system including a motor for rotating the shutter about its central axis. The filter is arranged in one of the slits. The shutter is a flat circular disc, the surface normal of which is inclined compared to the main axis of the radiation path.