Optical receiving device for laser scanner i.e. distance measuring laser scanner, for receiving reflected laser beams, has filter provided for filtering unwanted components in laser beams and arranged in parallel optical path before lens

摘要

The device has a detector (D) for receiving laser beams from a laser scanner, and a lens (L) for guiding the laser beams to be received by the detector. A filter (F) is provided for filtering unwanted components in the laser beams, where the filter is arranged in a parallel optical path (Ip) before the lens. The filter is made of a material such as red glass, which is transparent for frequency ranges which are to be transmitted.