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:
Feb. 04, 2025
Filed:
Feb. 24, 2022
Dräger Safety Ag & Co. Kgaa, Lübeck, DE;
Håkon Sagberg, Oslo, NO;
Britta Grennberg Fismen, Oslo, NO;
Kari Anne Hestnes Bakke, Hvittingfoss, NO;
Jon Tschudi, Oslo, NO;
Ib-Rune Johansen, Oslo, NO;
Knut Baeroe Sandven, Oslo, NO;
DRÄGER SAFETY AG & CO. KGaA, Lübeck, DE;
Abstract
A gas sensor for measuring concentration of a predetermined gas includes a light source () arranged to emit pulses of light, a measurement volume (), a detector () arranged to receive light that has passed through the measurement volume (), and an adaptable filter () disposed between the light source () and the detector (). The gas sensor has a measurement state in which it passes at least one wavelength band which is absorbed by the gas and a reference state in which said wavelength band is attenuated relative to the measurement state. A controller is connected to each of the light source, the detector and the adaptable filter to change the adaptable filter between one of said measurement state and said reference state to the other at least once during a gas sensor operation period.