Patent ID: 11885726
Assignee: AMS AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A particulate matter sensor module comprising:
a substrate;
a light source and a light detector mounted on the substrate; and
a housing attached to the substrate and including first and second sections attached to one another in a stack over the substrate such that the first section is disposed between the substrate and the second section, wherein the first and second sections, in combination, define a light reflection chamber, a fluid flow conduit, a particle-light interaction chamber, and a light trap chamber,
the first section having a first aperture through which light emitted by the light source can pass to a reflective surface within the light reflection chamber, the reflective surface being configured to reflect the light toward the particle-light interaction chamber where the light can interact with particles in a fluid flowing in the fluid flow conduit,
the first section having a second aperture through which light scattered in the particle-light interaction chamber as a result of interaction with one or more of the particles can pass for sensing by the detector,
wherein the fluid flow conduit includes a fluid inlet portion having an end coupled directly to the particle-light interaction chamber,
wherein the particle-light interaction chamber has an input end and an output end, the particle-light interaction chamber having a tapered cross-section that widens along an axis parallel to a light beam path between the reflective surface and the light trap chamber, wherein the tapered cross-section widens continuously from the input end to the output end, in a direction toward the light trap chamber.