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:
Nov. 23, 2010
Filed:
Jun. 26, 2006
Johan Marra, Eindhoven, NL;
Johan Marra, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention relates to an ultra fine particle sensor () for sensing airborne particles with a diameter in a range of approximately 1-500 nm. The sensor comprises an air inlet () for entry of a flow of ultra fine particles and a concentration variation section () capable of causing a variation of the concentration of ultra fine particles between at least a first concentration level and a second concentration level during at least one time interval. A particle sensing section () is provided capable of producing a measurement signal (I) varying in dependence of said variation between said first concentration level and said second concentration level. An evaluation unit () is provided capable of deriving data relating to said ultra fine particles form said varying measurement signal. As a result of the applied variation in the concentration level, data can be obtained from the resulting variation of the measurement signal which relate to the length concentration and number concentration of airborne ultra fine particles per unit volume.