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:
Dec. 17, 2013
Filed:
Nov. 20, 2009
Johannes Marra, Eindhoven, NL;
Johannes Marra, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
A particle sensor is disclosed capable of sensing airborne particles larger than about 10 nm in an airflow passing through a passage inside the sensor. The sensor comprises a high-voltage discharge electrode for generating airborne unipolar ions that charge the airborne particles in the airflow. The generated ions are furthermore used to set-up an ionic wind between the discharge electrode and a counter electrode inside the sensor. The ionic wind is the driving force for maintaining the airflow through the sensor and allows sensor operation to occur free of audible noise. The presence of charged particles in the airflow is measured by an electrical current meter in the particle sensing section which measures the particle-bound charge that precipitates per unit time on the surface of a precipitation electrode after all airborne ions have been removed from air by a separate screening electrode positioned upstream of the particle sensing section.