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Technical Discussions
David Harvey
David Harvey
00:30 Mar-05-2003
Reflector plate testing

We employ reflector-plate testing on relatively thin (0.090" to 0.500") refractory metals. I would very much like to change to a back - surface reflection moniotoring type of test. Does anyone have any wisdom to contribute to this question? I understand some of the obvious differences, but I am somewhat stymied in coming up with the justification for trying to change over to this test. Thank you for your assistance.


 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1304

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1304
01:21 Mar-05-2003
Re: Reflector plate testing
Mr. Harvey:
Could you please provide a bit more information.
I am not clear on what "reflector-plate" testing is.
What are you monitoring or testing for. (Can I assume you are using some form of automated ultrasonic configuration?)
Ed

: We employ reflector-plate testing on relatively thin (0.090" to 0.500") refractory metals. I would very much like to change to a back - surface reflection moniotoring type of test. Does anyone have any wisdom to contribute to this question? I understand some of the obvious differences, but I am somewhat stymied in coming up with the justification for trying to change over to this test. Thank you for your assistance.
.




 
 Reply 
 
Carlos Valdecantos
Engineering
MTORRES, Ing., Spain, Joined May 2001, 9

Carlos Valdecantos

Engineering
MTORRES, Ing.,
Spain,
Joined May 2001
9
09:31 Mar-06-2003
Re: Reflector plate testing
As far as I understand, reflector plate test is also referred to as "double transmission" and gives no information about time of flight (thickness or flaw depth) because the echo being monitored is the one coming from the plate which is kept at a fixed distance from the transducer. Defects are shown in the C-scan as amplitude fall of the plate echo. Axial resolution is not involved, so standard transducer can be used. Although pulse-echo systems are used, reflector plate test is not strictly a pulse-echo test.

True pulse-echo test makes use the backwall echo of the part under test. This gives information on the amplitude (C-scan) and time of flight (D-scan), so thickness of the part and depth of defects are measured. High axial resolution transducers are required for thin parts testing. Also geometric requirements (perpendicularity to the part surface) are more stringent in pulse echo.


C. Valdecantos


 
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