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Technical Discussions
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
06:13 Mar-06-2003
Re: Reflector plate testing - description

Reflector plate testing is akin to thru-transmission, but only using one transducer. The sound passes through the material under test, is reflected back from a smooth plate parallel to and some given distance from the material tested, and back through the test material to the probe. The reflections from the reflector plate are monitored, with a decrease in amplitude signifying an indication.
Due to the need to support or fixture the thin material under test, this is a very time-consuming test, and we are looking very hard at replacing it with a back-surface loss type of test.
My request of the list members is for help in making sure I have not forgotten something obvious (or obscure) - at this point is seems our biggest concern is the possibility of a laminar defect that shows up at 1/2 thickness and would give us a signal that would fall on a back reflection on the time base.
Your comments and suggestions are much appreciated!!
: 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.
'
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