In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels
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. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, 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.
- Inventors:
-
- Marietta, GA
- Atlanta, GA
- Lawrenceville, GA
- Issue Date:
- Research Org.:
- Institute of Paper Chemistry
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 871376
- Patent Number(s):
- 5719337
- Assignee:
- Institute of Paper Science and Technology, Inc. (Atlanta, GA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- AC05-86CE40777
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- in-plane; ultrasonic; velocity; measurement; longitudinal; shear; waves; machine; direction; transducers; rotating; wheels; improved; measuring; signals; plane; moving; web-like; materials; paper; paperboard; addition; measurements; web; md; cd; embodiment; accordance; adapted; provide; on-line; indication; polar; specific; stiffness; measured; plurality; carried; synchronously; driven; cylinders; eliminating; undue; transducer; wear; due; speed; differences; relatively; constant; contact; force; webs; mounted; sensor; housings; spring; biasing; radially; outwardly; easily; conveniently; carrier; shear waves; ultrasonic signal; shear wave; relatively constant; ultrasonic transducer; ultrasonic signals; radially outwardly; radially outward; moving web; ultrasonic transducers; velocity measurements; rotating wheel; sonic signals; wear due; web-like materials; provide relatively; sonic velocity; moving web-like; constant contact; velocity measurement; ultrasonic velocity; web-like material; sensor housing; sonic signal; machine direction; /73/
Citation Formats
Hall, Maclin S, Jackson, Theodore G, and Knerr, Christopher. In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels. United States: N. p., 1998.
Web.
Hall, Maclin S, Jackson, Theodore G, & Knerr, Christopher. In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels. United States.
Hall, Maclin S, Jackson, Theodore G, and Knerr, Christopher. Tue .
"In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels". United States. https://www.osti.gov/servlets/purl/871376.
@article{osti_871376,
title = {In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels},
author = {Hall, Maclin S and Jackson, Theodore G and Knerr, Christopher},
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. In addition to velocity measurements of ultrasonic signals in the plane of the web in the MD and CD, 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 17 00:00:00 EST 1998},
month = {Tue Feb 17 00:00:00 EST 1998}
}
Works referenced in this record:
Thickness Direction Measurements in Paper Materials Using Ultrasonic Sensors Immersed in Water-Filled Wheels
book, January 1991
- Brodeur, P. H.; Hall, M. S.; Lorenz, K. W.
- Ultrasonics International 91