Method for wavelength calibration of an electromagnetic...

G - Physics – 01 – N

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Details

G01N 21/31 (2006.01) G01J 3/02 (2006.01) G01J 3/26 (2006.01) G01N 21/35 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2325485

The invention concerns a method for wavelength calibration of an electromagnetic radiation filtering device (16) included in an apparatus (10; 32) measuring spectral transmission of a propagating medium external to said apparatus and wherein said radiation flows through, said filtering device having spectral transmission tuneable on a wavelength range based on the value of a physical parameter. The invention is characterised in that it consists in: selecting at least one absorbing gaseous line which is always present in natural form in the propagation medium and whereof the corresponding wavelength is included in said filtering device tunability wavelength range; and in calibrating the filtering device with respect to said at least one absorbing gaseous line which is used as natural reference.

La présente invention concerne un procédé d'étalonnage en longueur d'onde d'un dispositif de filtrage (16) d'un rayonnement électromagnétique qui est inclus dans un appareil (10; 32) mesurant la transmission spectrale d'un milieu de propagation externe audit appareil et dans lequel milieu ledit rayonnement se propage, ledit dispositif de filtrage présentant une transmission spectrale accordable sur une gamme de longueurs d'onde dudit rayonnement en fonction de la valeur d'un paramètre physique, caractérisé en ce que ledit procédé consiste à: sélectionner au moins une raie gazeuse d'absorption qui soit toujours présente à l'état naturel dans le milieu de propagation et dont la longueur d'onde correspondante soit incluse dans ladite gamme de longueurs d'onde d'accordabilité du dispositif de filtrage; et étalonner le dispositif de filtrage par rapport à ladite au moins une raie gazeuse d'absorption qui sert de référence naturelle.

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