Device for measuring a flux of matter by absorption of light, and corresponding measuring method

A method comprising:

• measuring a matter flux by using a measuring device, comprising:
• at least one first light source light source configured to emit a first light beam having a measurement wavelength corresponding to the absorption wavelength of an element of interest of said matter flux;
• an optical connector;
• and
• a light sensor configured to receive, via said optical connector:
• an attenuated beam resulting from a transmission of the first light beam through said matter flux;
• and
• a non-attenuated beam resulting from a transmission of the first light beam without passing through said matter flux;
• wherein the light sensor is a one-dimensional light sensor;
• and wherein the optical connector is positioned relative to the one-dimensional light sensor such that the center of the optical connector is aligned with the center of the one-dimensional light sensor, such that the non-attenuated beam is spectrally directed towards a first part of the one-dimensional light sensor and such that the attenuated beam is spectrally directed towards a second part of the one-dimensional light sensor;
• wherein the measuring comprises measuring the matter flux as a function of the attenuated beam received by the first part of the one-dimensional light sensor and of the non-attenuated beam received by the second part of the one-dimensional light sensor.