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. 37 figs.
- Inventors:
- Publication Date:
- Research Org.:
- Institute of Paper Chemistry
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 570412
- Patent Number(s):
- US 5,719,337/A/
- Application Number:
- PAN: 8-760,839
- 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: 17 Feb 1998
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; TRANSDUCERS; PAPER INDUSTRY; ULTRASONIC TESTING; ON-LINE MEASUREMENT SYSTEMS; ULTRASONIC WAVES; PROCESS CONTROL
Citation Formats
Hall, M S, Jackson, T G, and Knerr, C. 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, M S, Jackson, T G, & Knerr, C. In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels. United States.
Hall, M S, Jackson, T G, and Knerr, C. 1998.
"In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels". United States.
@article{osti_570412,
title = {In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels},
author = {Hall, M S and Jackson, T G 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. 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. 37 figs.},
doi = {},
url = {https://www.osti.gov/biblio/570412},
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