APPARATUS FOR THE MEASUREMENT OF THE GAS CONCENTRATION IN A SEALED CONTAINER

摘要

Apparatus (100) for measuring the concentration of a gas in a sealed container (200) at least a portion of which is optically transparent is described, the container (200) containing a mixture of gases including the gas to be measured. The apparatus comprises a tunable laser source (10) designed to transmit a laser beam (F) at a predetermined wavelength, the source being positioned such that the laser beam passes through the optically transparent portion of the container (200) which contains the mixture including the gas whose concentration is to be measured; a detector (30) designed to detect the laser beam (F) which is attenuated by the absorption of the gas whose concentration is to be measured; the detector (30) transmitting as output a datum representing an absorption spectrum of the gas whose concentration is to be measured; the laser source (10) and the detector (30) forming a first measurement channel; a second laser source (110) designed to transmit a second laser beam (F') at a predetermined wavelength, the second source being positioned such that the second laser beam passes through the optically transparent portion of the container (200) containing the mixture of gases; a second detector (130) designed to detect the second laser beam (F') which is attenuated by the absorption of a second gas in the mixture; this second detector (130) transmitting as output a datum representing a second absorption spectrum of the second gas; the second laser source (110) and the second detector (130) forming a second measurement channel. The apparatus further comprises a calculation device (40) designed to use parameters of the first and second absorption spectra to calculate the concentration of the gas to be measured.