Patent ID: 9297757
Filing Date: 2016-03-29
CPC Classification: C03B,G01N

Claim Text:
1. A device for measuring the concentration of a molecule in a gaseous atmosphere at a temperature above 1200° C. in a chamber, said molecule having an absorption line at a wavelength between 4 and 8 μm, said device comprising: an emitter that emits laser radiation with a wavelength corresponding to that of the absorption line of said molecule, said emitter emitting the laser radiation through a first window and then through said gaseous atmosphere, said first window comprising a solid material, the solid material having a transmittance greater than 50% measured on one mm thick of the material at the wavelength of the laser radiation, the laser radiation being analyzed after passing through said atmosphere by an analyzer that determines the absorption of the laser radiation by the molecule in the gaseous atmosphere, wherein the window is placed on or in a wall of the chamber, where appropriate via an insert, to prevent hot atmosphere of the chamber from escaping therefrom.