The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 2022
Filed:
Jul. 25, 2018
Koninklijke Philips N.v., Eindhoven, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
A particle sensing apparatus is provided for determining particle concentration in a fluid, e.g. air. The apparatus is based on fluid-flow passageway having an upstream inlet to receive the fluid and a downstream outlet to exhaust the fluid. It also includes a recirculation passageway in fluid communication with the fluid-flow passageway. Between them, the fluid-flow passageway and the recirculation passageway define a recirculation loop. A first particle sensor is located in the recirculation loop, and other sensors may also be present at other options. A force applicator is included in the fluid-flow passageway to apply a force to the particles entrained in the fluid. The force is used to direct some or all of the particles into the recirculation loop. This provides a choice between increasing the detection limit or the detection range. A processor determines the concentration of particles in the fluid based on the concentration of particles detected at the first particle sensor.