Patent ID: 9097666
Filing Date: 2015-08-04
Classification: G01B,G01J,G01N

Abstract:
1. A non-invasive method for determining a concentration of a gas component in a gas mixture contained in a spacing of a glass unit having at least two glass sheets spaced apart from each other and forming said spacing, the method comprising: applying one or more light beams at an angle to the surface of said glass unit, wherein the wavelength of the emitted light beam is varied around or over the at least one absorption line of the interest gas component, collecting by a detector the light beams transmitted through or reflected from at least one surface or interface locating at the opposite side of the spacing, determining non-linear variations in the intensity of the transmitted or reflected light beams over an absorption line of the interest gas component to be determined, and determining the concentration of the gas component based on said non-linear variations in the intensity.