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Title: 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:
; ;
Issue Date:
Research Org.:
Institute of Paper Chemistry
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
570412
Patent Number(s):
5719337
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. Tue . "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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {2}
}