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- since 1996 -

Hillger Ing. Büro
was founded in 1984 and develops special ultrasonic imaging systems for high-tech materials.

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Technical Discussions
Yasin Karavacýoðlu
Yasin Karavacýoðlu
01:17 Nov-26-1999
Lamb waves

Dear experts and academissions;
I study on lamb waves for using on aging aircraft.
if anybody know about on this subject any article or url address
please inform me




    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
01:32 Nov-28-1999
Re: Lamb waves
: Dear experts and academissions;
: I study on lamb waves for using on aging aircraft.
: if anybody know about on this subject any article or url address
: please inform me
-----------------

A search via NDTnet or the NDTnet Virtual Library should cover almost all Internet resources.
The NDT Search Form provides the selectable Keyword "lamb wave", however if you use the Virtual Library Search or any other Internet Search Engines you shall use also the synonym "guided wave" or "guided waves".

Rolf Diederichs



    
 
 
Grant Gordon
Grant Gordon
05:44 Nov-29-1999
Re: Lamb waves
: Dear experts and academissions;
: I study on lamb waves for using on aging aircraft.
: if anybody know about on this subject any article or url address
: please inform me

You may be interested in the following paper:
G. A. Gordon and T. D. Mast, "Wide-Area Imaging of
Ultrasonic Lamb Wave Fields by Electronic Speckle
Pattern Interferometry," Proc. SPIE Nondestructive
Techniques for Aging Aircraft, Airports, and Aerospace
Hardware III, 3586, pp. 297-309, 1999.
The paper has a large reference section that may also be helpful.
In the near future, the paper should be able at the fllowing URL:
http://www.arl.psu.edu/publications/publications.html
Cheers.



    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
07:50 Nov-29-1999
Re: Lamb waves
Thanks to Grant Gordon's information I could find the
abstract of his publication through the NDTnet Library Search.
During the last month we have added 26 SPIE proceedings with
more than thousands of abstracts to the crawler range.

Wide-area imaging of ultrasonic Lamb wave fields by electronic
speckle pattern interferometry, pp.297-309

Author(s): Grant A. Gordon, The Pennsylvania State Univ.,
State College, PA, USA; Truman D. Mast, The Pennsylvania State Univ.,
State College, PA, USA.

Abstract: Ultrasonic elastic waves have traditionally been
examined using single point measurement techniques. In
this paper, we present a technique capable of recording
out-of-plane ultrasonic displacement data over wide
areas. The method employs 2D surface vibration data
collected via electronic speckle pattern interferometry
used in combination with laser modulation and optical
phase stepping. Using this rapid, wide-area measurement
method, images of ultrasonic Lamb waves onideal and
flawed plate structures are presented. For a single
ultrasonic excitation frequency, multiple data records
are collected as an externally excited traveling plate
wave moves through the sample. When an optical phase
shift is introduced between the data records, the data
can be processed to yield quantitative displacement
fields. The resulting processed images demonstrate
evidence of Lamb wave reflection, transmission and
scattering. Following the full field data collection, a
novel inverse scattering algorithm was applied to
reconstruct images of the scattering sources
responsible for the measured displacement field data.
The results of these investigations will be presented
and discussed in the context of detecting hidden flaws
in aging aircraft.
: : Dear experts and academissions;
: : I study on lamb waves for using on aging aircraft.
: : if anybody know about on this subject any article or url address
: : please inform me

: You may be interested in the following paper:
: G. A. Gordon and T. D. Mast, "Wide-Area Imaging of
: Ultrasonic Lamb Wave Fields by Electronic Speckle
: Pattern Interferometry," Proc. SPIE Nondestructive
: Techniques for Aging Aircraft, Airports, and Aerospace
: Hardware III, 3586, pp. 297-309, 1999.
: The paper has a large reference section that may also be helpful.
: In the near future, the paper should be able at the fllowing URL:
: http://www.arl.psu.edu/publications/publications.html
: Cheers.




    
 
 
Yasin Karavacýoðlu
Yasin Karavacýoðlu
00:42 Nov-29-1999
Re: Lamb waves
dear gordon;
Thank you for your interesting. I cant reach your article from internet.
Especially ý interested in sensivity of guided waves for detection of fatigue cracks. if you have any opinion,please inform me. Also what kind of probes can be usable.
best regards




    
 
 
Dave Lines
R & D,
Diagnostic Sonar Ltd, United Kingdom, Joined Nov 1998, 8

Dave Lines

R & D,
Diagnostic Sonar Ltd,
United Kingdom,
Joined Nov 1998
8
07:59 Nov-30-1999
Re: Lamb waves

: Dear experts and academissions;
: I study on lamb waves for using on aging aircraft.
: if anybody know about on this subject any article or url address
: please inform me

You may also be interested in the online proceedings of the 3rd Joint FAA/DoD/NASA Conference on Aging Aircraft held 20-23 Sep 99 in Albuquerque, New Mexico.

These can be found on http://www.galaxyscientific.com/agingaircraft/home.htm.

There were a couple of papers relating to Lamb waves, e.g. "Ultrasonic Technique for Hidden Corrosion Detection in Aircraft Wing Skin" by A. Chahbaz, J. Gauthier, M. Brassard, Tektrend International, Quebec, Canada, D.R. Hay, TISEC Inc. (see session 6C) but you may find more of interest.

Dave Lines



    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
09:32 Nov-30-1999
Re: Lamb waves
That's really a great source Dave Lines pointed out.
You can find about 15 NDT full-text articles, however as PDF downloads.
We'll add these articles to the crawler range, so that
it will be included into the Internet full-text search of the NDTnet Library.

Rolf

--------------------
: : Dear experts and academissions;
: : I study on lamb waves for using on aging aircraft.
: : if anybody know about on this subject any article or url address
: : please inform me

: You may also be interested in the online proceedings of the 3rd Joint FAA/DoD/NASA Conference on Aging Aircraft held 20-23 Sep 99 in Albuquerque, New Mexico.

: These can be found on http://www.galaxyscientific.com/agingaircraft/home.htm.

: There were a couple of papers relating to Lamb waves, e.g. "Ultrasonic Technique for Hidden Corrosion Detection in Aircraft Wing Skin" by A. Chahbaz, J. Gauthier, M. Brassard, Tektrend International, Quebec, Canada, D.R. Hay, TISEC Inc. (see session 6C) but you may find more of interest.

: Dave Lines




    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
00:49 Dec-01-1999
Re: Lamb waves
: dear gordon;
: Thank you for your interesting. I cant reach your article from internet.
: Especially ý interested in sensivity of guided waves for detection of fatigue cracks. if you have any opinion,please inform me. Also what kind of probes can be usable.
: best regards
-----------------

There are still not ALL papers available via the Internet!
But at SPIE you can order online a paper for $15.00 (non-members).

Try this link directly to the order of the paper.
http://bookstore.spie.org/cgi-bin/order.acgi?bc=1999SPIE%2e3586%2e%2e297G&ti=Wide-area%20imaging%20of%20ultrasonic%20Lamb%20wave%20fields%20by%20electronic%20speckle%20pattern%20interferometry&t=a&of=1

Rolf




    
 
 
Eulalio Rodriguez
Eulalio Rodriguez
03:47 Sep-17-2000
Re: Lamb waves
I did my Ph D. diseertation on the use of Lamb waves
to mesure the elasticity constants of thin plates.
If you intertested in a copy let me know. The reserach as was done
at the Univeristy of Texas at el Paso in 1998. See a paper at
http://www.ndt.net/abstract/asntf97/004.htm




    
 
 

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