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- since 1996 -

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Technical Discussions
RT. JEYAKUMAR
NDT Inspector
Singapore, Joined Aug 2002, 10

RT. JEYAKUMAR

NDT Inspector
Singapore,
Joined Aug 2002
10
09:50 Nov-29-2005
CHIME TECHNIQUE

Dear Sir,

Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.

Can anyone please kindly explain about it?

Thank you very much

With regards,

RT. Jeyakumar


 
 Reply 
 
Alan Maclean
Alan Maclean
05:00 Dec-06-2005
Re: CHIME TECHNIQUE
----------- Start Original Message -----------
: Dear Sir,
: Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: Can anyone please kindly explain about it?
: Thank you very much
: With regards,
: RT. Jeyakumar

The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.

Regards

Alan Maclean


------------ End Original Message ------------




 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
03:58 Dec-06-2005
Re: CHIME TECHNIQUE
I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.

Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.

Is the CHIME an acronym? Is so, what does it mean?

Sincerely,

J. Mark Davis
----------- Start Original Message -----------
: : Dear Sir,
: : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : Can anyone please kindly explain about it?
: : Thank you very much
: : With regards,
: : RT. Jeyakumar
: The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: Regards
: Alan Maclean
:
------------ End Original Message ------------




 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
09:31 Dec-07-2005
Re: CHIME TECHNIQUE
Hello Mark

A blurb appears in December's Insight - "A new approach to pipe and vessel inspection for corrosion and cracking" for Veritec Sonomatic's CHIME service. It says CHIME is Creeping Headwave Inspection MEthodology. and uses a combination of ultrasonic headwaves and creeping waves, plus pulse-echo backscatter reflective techniques. It appears to be qualitative rather than quantitaive as it is claimed the system can differentiate material thinning into three categories, <10%t, 10-40%t and >40%t.

Hope this helps

regards

Nigel


----------- Start Original Message -----------
: I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.
: Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.
: Is the CHIME an acronym? Is so, what does it mean?
: Sincerely,
: J. Mark Davis
: : : Dear Sir,
: : : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : : Can anyone please kindly explain about it?
: : : Thank you very much
: : : With regards,
: : : RT. Jeyakumar
: : The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: : Regards
: : Alan Maclean
: :
------------ End Original Message ------------




 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
03:53 Dec-08-2005
Re: CHIME TECHNIQUE
To All,

To add to Paul's comments:

The High Angle L-Wave with the Creeping Wave Technique can be calibrated for a Time of FLight (TOF)measurement which can provide a quantative depth or crack height measurement.

(Note: I have used only the Creeping Wave Method three (3) times to pass the EPRI NDE Center Crack Sizing Exam to show it can be a quantative method. I will add that it is "normally" a qualitative method for crack sizing as Paul mentioned. All this is really based upon the critical flaw depth)

In addition to the TOF L-wave, the echo dynamnics of the mode converted signal (Shear wave mode converted to an L Wave, and reflected as an L Wave, called CE-1) is a very useful piece of data for crack depth measurments. This is qualitattvie

To conlcude, it is the combination of absence or presence of the 3 signals (L-wave, CE-1 and CE-2) as well as echo dynamics and the TOF of the High Angle L-wave that provide qualitative or quantative crack height information.

Calibration is conducted on a block of similar material type as the component as to be examined, with notches of varying depth, i.e., 20 %, 40 %, 60 %, and 80 %. A signal pattern is observed from each notch and a comparison is made from the notches to the crack. This can be a subjective or objective analysis.

Please go to the ndt.net publications section to view the intorductory chapter from the Handbook on Advanced UT Flaw Sizing. This will expalin the wave physics assoiated with using Creeping waves.

I myself will be speaking with Paul about his probe designs using creeping waves for a CHIME Technique.

Sincerely,

J. Mark Davis

----------- Start Original Message -----------
: Hello Mark
: A blurb appears in December's Insight - "A new approach to pipe and vessel inspection for corrosion and cracking" for Veritec Sonomatic's CHIME service. It says CHIME is Creeping Headwave Inspection MEthodology. and uses a combination of ultrasonic headwaves and creeping waves, plus pulse-echo backscatter reflective techniques. It appears to be qualitative rather than quantitaive as it is claimed the system can differentiate material thinning into three categories, <10%t, 10-40%t and >40%t.
: Hope this helps
: regards
: Nigel
:
: : I have not heard of the CHIME Technique? Then I see the mention to what looks like ID and OD Creeping Waves. Then I see a reference to Shear Waves with Surface Waves.
: : Is the CHIME Technique another name for the Creeping Technique that we usually reference as ID Creeping Waves. These are the result of Mode Conversions that take palce at the ID or Opposite Surface which is the scanning surface.
: : Is the CHIME an acronym? Is so, what does it mean?
: : Sincerely,
: : J. Mark Davis
: : : : Dear Sir,
: : : : Is that chime technique use of both shear wave angle along with surface wave. If so, there is chance missing flaws on the back surface, since surface wave could not travel through.
: : : : Can anyone please kindly explain about it?
: : : : Thank you very much
: : : : With regards,
: : : : RT. Jeyakumar
: : : The CHIME technique as it names suggests has creeping waves propagating along the top and inner surfaces which in turn generate headwaves between the inner and outer surfaces.
: : : Regards
: : : Alan Maclean
: : :
------------ End Original Message ------------




 
 Reply 
 

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