Method for marking liquids with at least two marker...

G - Physics – 01 – N

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G01N 33/28 (2006.01) C10L 1/00 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2329221

The present invention relates to a method of marking liquids using at least two markers, wherein said markers absorb in the 600-1200 nm region of the spectrum and reemit fluorescent light and the absorption range of at least one marker overlaps with the absorption range of at least one other marker. The present invention further relates to a method for detecting markers in liquids marked by the method of the invention, which comprises using light sources which emit radiation in the absorption ranges of said markers and detecting the fluorescent light reemitted by said markers, at least one of said light sources emitting radiation in the overlapping absorption range of at least one marker with that of at least one other marker and the number of light sources being less than or equal to the number of markers. The present invention further relates to liquids marked by the method of the invention.

L'invention concerne un procédé pour marquer des liquides avec au moins deux substances de marquage, caractérisé en ce que les substances de marquage sont absorbantes dans la gamme spectrale comprise entre 600 et 1200 nm, et par conséquent émettent un rayonnement fluorescent, et en ce que la plage d'absorption d'au moins une substance de marquage chevauche la plage d'absorption d'au moins une autre substance de marquage. L'invention concerne également un procédé pour détecter ces substances de marquage dans des liquides marqués selon le procédé mentionné ci-dessus, caractérisé en ce que l'on utilise des sources de rayonnement qui émettent un rayonnement dans les plages d'absorption des substances de marquage. Au moins une des sources de rayonnement émet un rayonnement dans la plage d'absorption d'au moins une substance de marquage, chevauchant la plage d'absorption d'au moins une autre substance de marquage, et le nombre de sources de rayonnement est inférieur ou égal au nombre de substances de marquage. L'invention concerne en outre des liquides qui sont marqués selon ledit procédé.

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