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:
Aug. 16, 2016
Filed:
Jul. 09, 2012
Johan Marra, Eindhoven, NL;
Johan Hendrik Klootwijk, Eindhoven, NL;
Jacobus Bernardus Giesbers, Son, NL;
Nico Maris Adriaan DE Wild, Eindhoven, NL;
Marcel Bulder, Eindhoven, NL;
Rogier Adrianus Henrica Niessen, Eindhoven, NL;
Peter Van Der Linde, Amersfoort, NL;
Johan Marra, Eindhoven, NL;
Johan Hendrik Klootwijk, Eindhoven, NL;
Jacobus Bernardus Giesbers, Son, NL;
Nico Maris Adriaan De Wild, Eindhoven, NL;
Marcel Bulder, Eindhoven, NL;
Rogier Adrianus Henrica Niessen, Eindhoven, NL;
Peter Van Der Linde, Amersfoort, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
A method of selectively sensing the concentration of a target gas in polluted ambient air comprises the steps of: —providing a target gas sensor () sensitive to the target gas; —providing a first gas flow derived from the ambient air, from which first flow the target gas is substantially removed; —providing a second gas flow derived from the ambient air, substantially comprising the same target gas concentration as the ambient air; —exposing the target gas sensor to the first gas flow during a first time interval, and obtaining from the sensor a first output signal (Smf); —exposing the target gas sensor to the second gas flow during a second time interval not overlapping with the first time interval, and obtaining a second output signal (Smu); —calculating the difference (SΔ) between the first and the second output signals; calculating the concentration of the target gas from the calculated signal difference (SΔ).