G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/18 (1995.01)
Patent
CA 2201874
This invention relates to a system for measuring ultrasonically the elastic properties of a moving paper web. An ultrasonic wave generating means (1; 20), generating a noise type ultrasonic signal, creates the ultrasonic wave in the web at an excitation point. A reference ultrasonic receiving means (Mic1, 7; 21, 7) is directed to receive contactlessly the ultrasonic wave from the excitation point. At least two pickup ultrasonic receiving means (Mic2A, 8, Mic2B, 9) receive contactlessly the ultrasonic wave generated by the ultrasonic wave generating means and reradiated by the paper web. A processing means (8 to 10) combines the outputs from the pickup ultrasonic receiving means. A computing means (13) processes the outputs from the reference receiving means and from the processing means, and determines the delay time between these outputs.
L'invention concerne un système d'évaluation, au moyen d'ultrasons, des propriétés élastiques d'une bande continue de papier en mouvement. Un dispositif générateur d'ondes ultrasonores (1; 20), en produisant un signal ultrasonore du type bruit, donne naissance à l'onde ultrasonore dans la bande en un point d'excitation. Un dispositif de référence, récepteur d'ultrasons (Mic1, 7; 21, 7), est orienté de manière à recevoir, sans contact, l'onde ultrasonore provenant du point d'excitation. Au moins deux dispositifs de réception des ondes ultrasonores (Mic2A, 8, Mic2B, 9) reçoivent sans contact l'onde ultrasonore produite par le dispositif générateur susmentionné et renvoyée par la bande continue de papier. Des organes de traitement (8 à 10) compilent les sorties provenant des dispositifs de réception tandis que des moyens de calcul (13), traitent les sorties du dispositif de référence et ceux des moyens de traitement, et mesurent la temporisation existant entre ces sorties.
Kazys Rymantas J.
Stolpe T. Patrik
Ab Lorentzen & Wettre
Marks & Clerk
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