Arrangement for laser-based detection of particles, has laser light source that irradiates particles with laser light, and photodetector that receives laser light scattered from particles and redirected by Fresnel lens

摘要

The arrangement (10) comprises a laser light source (13) for irradiation of the particles with laser light. The Fresnel lens (18,19) redirects the laser light. A photodetector (20,21) receives the laser light (16) scattered from the particles and redirected by the Fresnel lens. The photodetector and Fresnel lens are respectively arranged in primary and secondary chambers of the housing (11). The Fresnel lens is made of plastic such as poly methyl methacrylate.