System for measuring ultrasonically the elastic properties...

Details System for measuring ultrasonically the elastic properties... System for measuring ultrasonically the elastic properties...

G - Physics

01

N

G01N 29/00 (2006.01) G01N 29/07 (2006.01) G01N 29/28 (2006.01) G01N 29/44 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2201732

The invention relates to a system for measuring ultrasonically the elastic properties of a moving paper web. A noise type ultrasonic sound wave is generated by an ultrasonic sound generating means (43 in the web at an excitation point. A reference ultrasonic wave reradiated into the air from the excitation point is indicated. Pick-up means (M2; Mic2A, Mic2B; Mic3A, Mic3B) is provided for receiving ultrasonic sound reradiated from the paper web at a predetermined distance from the location of the sound generating means (4). The ultrasonic generating means (4) and the reference ultrasonic receiving means (M1,5) are provided on the same side of the paper web. At least one of these two kind of means comprises a number of elements provided symmetrically in relation to the other means.

L'invention a trait à un système servant à mesurer, au moyen d'ultrasons, les propriétés élastiques d'un rouleau continu de papier en mouvement. Une onde ultrasonore est générée par un dispositif servant à générer des ultrasons (4) dans le rouleau continu, à un point d'excitation donné. Un ultrason de référence réémis dans l'air à partir du point d'excitation est indiqué. Des éléments capteurs (M2; Mic2A, Mic2B; Mic3A, Mic3B) permettent de capter les ultrasons réémis à partir du rouleau de papier continu à une distance prédéterminée de l'emplacement du générateur d'ultrasons (4). Le générateur d'ultrasons (4) et le capteur d'ultrasons de référence (M1,5) se trouvent du même côté du rouleau de papier continu. Au moins un de ces dispositifs comporte un certain nombre d'éléments disposés de façon symétrique par rapport aux autres dispositifs.

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