Patent ID: 9574995
Date: 2017-02-21
CPC Classifications: G01N,Y02A

Claim:
1. A device for measuring the concentration of a predetermined gas comprising at least CO2, comprising: a cavity holding a gas mixture containing the predetermined gas in a concentration to be measured, a light source capable of emitting, within the cavity, light rays within a basic spectral range including visible and infrared, a detector configured to receive a portion of the light rays within a first predefined spectral range corresponding to high absorption of the predetermined gas, a photodiode configured to receive a portion of the same light rays within a second predetermined spectral range corresponding to low absorption of the predetermined gas, a control unit configured to calculate the concentration of the predetermined gas by comparing electrical signals respectively representative of the radiant power received by the detector and of the radiant power received by the photodiode, wherein the photodiode operates in the visible range, meaning λ