Abstract: A method for measuring a quantity of a gaseous species—present in a gas and able to absorb light in an absorption spectral band—comprises: arranging the gas between a light source and a measurement photodetector, the light source being suitable for emitting an incident light wave propagating through the gas to the measurement photodetector, which is suitable for detecting a light wave transmitted by the gas, in the absorption spectral band; illuminating the gas by the light source; measuring, by the measurement photodetector, a measurement intensity of the light wave transmitted by the gas, in the absorption spectral band; measuring, by a reference photodetector, a reference intensity of a reference light wave being emitted by the light source. The method comprises a correction of the reference intensity by consideration of a parametric model, the parameters of the model being determined according to reference intensity measurements performed at various times.

Abstract: A method for measuring a quantity of a gaseous species—present in a gas and able to absorb light in an absorption spectral band—comprises: arranging the gas between a light source and a measurement photodetector, the light source being suitable for emitting an incident light wave propagating through the gas to the measurement photodetector, which is suitable for detecting a light wave transmitted by the gas, in the absorption spectral band; illuminating the gas by the light source; measuring, by the measurement photodetector, a measurement intensity of the light wave transmitted by the gas, in the absorption spectral band; measuring, by a reference photodetector, a reference intensity of a reference light wave being emitted by the light source. The method comprises a correction of the reference intensity by consideration of a parametric model, the parameters of the model been determined according to reference intensity measurements performed at various times.

Abstract: System for counting an elementary displacement of a person, comprising a casing and fixing means for securely tying said casing to a part of the body of said person, comprising: a magnetometer with at least one measurement axis; and calculation means adapted for performing, for each measurement axis, the scalar product of at least one temporal mask and of the component of the signal along the measurement axis over the duration of said mask.