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Title: Method and system of measuring ultrasonic signals in the plane of a moving web

Abstract

An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like is disclosed. In addition to velocity measurements of ultrasonic signals in the plane of the web in the machine direction, MD, and a cross direction, CD, generally perpendicular to the direction of the traveling web, therefore, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web. 37 figs.

Inventors:
; ; ;
Issue Date:
Research Org.:
Institute of Paper Chemistry
OSTI Identifier:
201523
Patent Number(s):
5,493,910
Application Number:
PAN: 7-970,624
Assignee:
Inst. of Paper Science and Technology, Inc., Atlanta, GA (United States)
DOE Contract Number:  
AC05-86CE40777
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 27 Feb 1996
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ULTRASONIC TESTING; ULTRASONIC WAVES; VELOCITY; MATERIALS; MEASURING METHODS; MEASURING INSTRUMENTS

Citation Formats

Hall, M S, Jackson, T G, Wink, W A, and Knerr, C. Method and system of measuring ultrasonic signals in the plane of a moving web. United States: N. p., 1996. Web.
Hall, M S, Jackson, T G, Wink, W A, & Knerr, C. Method and system of measuring ultrasonic signals in the plane of a moving web. United States.
Hall, M S, Jackson, T G, Wink, W A, and Knerr, C. Tue . "Method and system of measuring ultrasonic signals in the plane of a moving web". United States.
@article{osti_201523,
title = {Method and system of measuring ultrasonic signals in the plane of a moving web},
author = {Hall, M S and Jackson, T G and Wink, W A and Knerr, C},
abstractNote = {An improved system for measuring the velocity of ultrasonic signals within the plane of moving web-like materials, such as paper, paperboard and the like is disclosed. In addition to velocity measurements of ultrasonic signals in the plane of the web in the machine direction, MD, and a cross direction, CD, generally perpendicular to the direction of the traveling web, therefore, one embodiment of the system in accordance with the present invention is also adapted to provide on-line indication of the polar specific stiffness of the moving web. In another embodiment of the invention, the velocity of ultrasonic signals in the plane of the web are measured by way of a plurality of ultrasonic transducers carried by synchronously driven wheels or cylinders, thus eliminating undue transducer wear due to any speed differences between the transducers and the web. In order to provide relatively constant contact force between the transducers and the webs, the transducers are mounted in a sensor housings which include a spring for biasing the transducer radially outwardly. The sensor housings are adapted to be easily and conveniently mounted to the carrier to provide a relatively constant contact force between the transducers and the moving web. 37 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {2}
}