Method and measurement device for measuring suspension

G - Physics – 01 – N

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G01N 21/17 (2006.01) D21C 7/12 (2006.01) D21C 9/10 (2006.01) G01N 21/31 (2006.01) G01N 21/84 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2398232

The invention relates to a method and a measurement device for measuring a suspension which contains wood fibres, the method comprising directing optical radiation at pulp and measuring optical radiation emitted by the pulp. The solution comprises measuring at least one of the following two properties: kappa number and brightness. The solution comprises changing the pulp consistency in a desired range of consistency extending from a desired initial consistency to a desired final consistency. The pulp consistency and the strength of a desired wavelength from the optical radiation are measured in the desired consistency range. Measurement points are modelled with a function of the desired type by fitting the parameters of the function according to the measurement points. Finally at least one of the following two properties of the pulp is determined by means of the modelling function: kappa number and brightness.

La présente invention concerne un procédé et un dispositif de mesure permettant de mesurer une suspension contenant des fibres de bois. Le principe est de diriger un rayonnement optique sur la pâte et à mesurer le rayonnement optique émis par la pâte. Le procédé consiste à mesurer l'un au moins des paramètres caractéristiques que sont l'indice Kappa et le degré de blancheur. Le procédé consiste ensuite à faire varier la consistance de la pâte dans des limites initiales et finales admissibles et à mesurer dans ces limites la consistance de la pâte et la puissance du rayonnement optique dans la longueur d'ondes désirée. On modélise alors les points de mesure avec une fonction d'un type approprié faisant intervenir une adaptation des paramètres de la fonction tenant compte des points de mesure. Il ne reste plus qu'à calculer l'un au moins des paramètres caractéristiques de la pâte que sont l'indice Kappa et le degré de blancheur en utilisant la fonction de modélisation.

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