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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.

Inventors:
 [1];  [2];  [3]
  1. Marietta, GA
  2. Atlanta, GA
  3. 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 G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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 = {1998},
month = {2}
}

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