公开(公告)号：US20240210296A1

公开(公告)日：2024-06-27

申请号：US18573961

申请日：2022-06-24

Applicant: ams-OSRAM AG

Inventor： Jochen KRAFT ,  Jaka PRIBOSEK ,  Andreas TORTSCHANOFF

IPC: G01N15/0205 ,  G01N15/00 ,  G01N15/075 ,  G02B6/12

CPC classification number: G01N15/0205 ,  G01N15/075 ,  G02B6/12 ,  G01N2015/035 ,  G02B2006/1215

Abstract: A particulate matter detector includes a light emitter configured to emit light, a first, a second and a third waveguide, a waveguide splitter, a detector, and a controller. The third waveguide is free of cladding. The first waveguide is coupled to the light emitter and guides emitted light toward the waveguide splitter. The first waveguide includes an interrogation region formed by a cladding-free surface of the first waveguide. During a measurement phase, a first intensity of the light in the first waveguide is set for determining a change in the intensity of the light detected by the detector. An indication of an opacity of the surface of the first waveguide with accumulated particulate matter is output. During a cleaning phase, a second intensity of the light in the first waveguide is set for directing the accumulated particulate matter from the interrogation region to the third waveguide via optical forces.