Converging optics for spectroscopic system

摘要

The optics allows light that is transmitted, scattered or reflected from an object to be detected simultaneously. The optics are coupled to the input of a spectroscopic system. The converging optics has a two-part objective lens. The two parts (L1,L2) of the lens have different focal lengths and are arranged close to each other, so that a light beam passing through enters through one of the two parts. Alternatively, the two-part objective lens may be in the form of a Fresnel lens with a first radius. In this case, both parts of the lens have the same focal length and are cut out of non-adjacent regions of a Fresnel lens having a radius that is larger than the first radius. The two parts are arranged close together, so that an entering light beam passes through one of the two parts.