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1. (WO1991017435) METHOD AND DEVICE FOR CONTINUOUSLY DETERMINING THE MODULUS OF ELASTICITY OF ADVANCING FLEXIBLE MATERIAL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017435 International Application No.: PCT/FR1991/000355
Publication Date: 14.11.1991 International Filing Date: 30.04.1991
Chapter 2 Demand Filed: 14.11.1991
IPC:
G01N 29/07 (2006.01) ,G01N 33/34 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
04
Analysing solids
07
by measuring propagation velocity or propagation time of acoustic waves
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
34
Paper
Applicants:
CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS, CARTONS ET CELLULOSES [FR/FR]; Domaine Universitaire F-38100 Grenoble, FR (AllExceptUS)
BONNET, Guy [FR/FR]; FR (UsOnly)
LEBAIGUE, Olivier [FR/FR]; FR (UsOnly)
Inventors:
BONNET, Guy; FR
LEBAIGUE, Olivier; FR
Agent:
LAURENT, Michel ; Cabinet Laurent et Charras 20, rue Louis-Chirpaz B.P. 32 F-69131 Ecully Cédex, FR
Priority Data:
90/0575402.05.1990FR
Title (EN) METHOD AND DEVICE FOR CONTINUOUSLY DETERMINING THE MODULUS OF ELASTICITY OF ADVANCING FLEXIBLE MATERIAL
(FR) PROCEDE ET DISPOSITIF POUR DETERMINER EN CONTINU LE COEFFICIENT D'ELASTICITE D'UN MATERIAU NON RIGIDE EN DEFILEMENT
Abstract:
(EN) The method enables a measurement of the modulus of elasticity of an advancing flexible material to be made accurately and in a contactless fashion. The method involves: firstly, transmitting through the air towards the material an ultrasonic wave train having a set frequency, the time of transmission of said wave train being the zero point of times to; sensing the ultrasonic waves scattered through the air by the material at a distance $i(d); measuring the wave train's propagation time t over distance $i(d); and finally, deducing from this measurement the wave train's propagation speed in the material, which is, in a known manner, proportional to the square root of the ratio between the modulus of elasticity and the density of said material. Applications: paper industry.
(FR) Procédé apte à permettre la mesure du coefficient d'élasticité d'un matériau non rigide en défilement, et ce de manière précise et sans contact, caractérisé en ce qu'il consiste: tout d'abord, à émettre dans l'air en direction du matériau un train d'ondes ultra-sonores de fréquence fixe et déterminée, l'instant d'émission dudit train d'ondes définissant l'origine des temps to; à capter, à une distance $i(d) les ondes ultra-sonores diffusées dans l'air par le matériau; à mesurer la durée t de propagation du train d'ondes sur la distance $i(d); et enfin, à déduire de cette mesure la vitesse de propagation du train d'ondes dans le matériau, qui est, de manière connue, proportionnelle à la racine carrée du rapport du module d'élasticité sur la masse volumique du matériau.
Designated States: CA, FI, JP, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: French (FR)
Filing Language: French (FR)