In-plane ultrasonic velocity measurement of longitudinal and shear waves in the machine direction with transducers in rotating wheels
- Marietta, GA
- Atlanta, GA
- Lawrenceville, GA
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.
- Research Organization:
- Institute of Paper Chemistry
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-86CE40777
- Assignee:
- Institute of Paper Science and Technology, Inc. (Atlanta, GA)
- Patent Number(s):
- US 5719337
- OSTI ID:
- 871376
- Country of Publication:
- United States
- Language:
- English
Thickness Direction Measurements in Paper Materials Using Ultrasonic Sensors Immersed in Water-Filled Wheels
|
book | January 1991 |
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Method and system of measuring ultrasonic signals in the plane of a moving web
Method and system of measuring ultrasonic signals in the plane of a moving web
Related Subjects
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
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