Optical particle counter for air quality assessment
AssigneeAms AG
InventorJaka Pribosek
Life of this patent
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Abstract
An apparatus for sensing particulate matter in a fluid includes a fluid flow conduit fluidically connected to an interaction chamber; a light source positioned to illuminate the interaction chamber; and a light detector assembly positioned to receive light scattered by particulate matter present in the interaction chamber. The light detector assembly includes a light detector; and an optical element, the optical element configured to provide light to the light detector based on an incidence angle of the scattered light.
Claims6
An apparatus for sensing particulate matter in a fluid, the apparatus comprising:
- a fluid flow conduit fluidically connected to an interaction chamber;
- an illumination assembly positioned to illuminate the interaction chamber with a shaped illumination beam having an intensity that increases across a diameter of the illumination beam from a first side of the illumination beam to a second side of the illumination beam opposite the first side;
- and
- a light detector disposed at the first side of the illumination beam and positioned to receive light scattered by particulate matter present in the interaction chamber.
A method for sensing particulate matter in a fluid, the method comprising:
- fluidically connecting a fluid flow conduit to an interaction chamber;
- positioning an illumination assembly to illuminate the interaction chamber with a shaped illumination beam having an intensity that increases across a diameter of the illumination beam from a first side of the illumination beam to a second side of the illumination beam opposite the first side;
- and
- disposing a light detector at the first side of the illumination beam and positioned to receive light scattered by particulate matter present in the interaction chamber.
Dependencies are inferred from the claim text.