Stray light detector e.g. optical particle detector, has detection optical system provided with light conducting element tapering from light input side to light output side

摘要

The stray light detector has a light source (1), a detection optical system coaxial to the beam emitted by the light source and a photosensor (9). The detection optical system has a light conducting element (8) which tapers from a light input side (8a) to a light output side (8b) and which has a light reflecting inner surface.