System for matching absorbance spectra employing a library...

G - Physics – 01 – N

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G01N 21/25 (2006.01) G01N 21/35 (2006.01)

Patent

CA 2201410

In a method of matching a known product with one of a library of known products, training sets of the absorbance spectra of the known products are measured and stored. The training sets of the known products are used to determine an expanded standard deviation spectrum for each known product wherein the expanded standard deviation spectrum combines the training set of spectra with shift replicated spectra into expanded training sets of spectra. The absorbance spectrum of the unknown product is measured and the distance of the spectrum of the unknown product from the expanded training sets of spectra is determined by dividing the values of the expanded standard deviation spectra into the difference between the absorbance spectrum of the unknown product and the mean spectrum of the training set.

Dans une méthode de comparaison d'un produit inconnu avec des produits connus catalogués, les ensembles d'apprentissage de spectres d'absorbance des produits connus sont mesurés et stockés. Les ensembles d'apprentissage des produits connus sont utilisés pour obtenir un spectre d'écart-type élargi pour chaque produit connu, ce spectre d'écart-type élargi combinant l'ensemble d'apprentissage des spectres reproduits par décalage pour donner des ensembles d'apprentissage de spectres élargis. Le spectre d'absorbance du produit inconnu est mesuré et la distance séparant le spectre de ce produit inconnu et les ensembles d'apprentissage de spectres élargis est déterminée en divisant les valeurs des spectres d'écart-type élargis par la différence séparant le spectre d'absorbance du produit inconnu et le spectre moyen de l'ensemble d'apprentissage.

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