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Technical Discussions
David Harvey
David Harvey
09:45 May-17-1999
Thickness measurement of layers of similar material

I have been handed the challenge of measuring the thickness of a layer of pure zirconium on a zircaloy-2 base material. The pure zirconium layer is approximately 0.008" thick, and resides on the inside surface of a tube of Zr-2. We accomplish this via UT for thicker layers (0.045" to .15"), but such a thin layer seems to be a bit more than our current instrumentation can handle. I would appreciate any suggestions as to how we might be able to incorporate this into a production-type test (a given lot may consist of hundreds of 10' tubes).


    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
03:01 May-18-1999
Re: Thickness measurement of layers of similar material

: I have been handed the challenge of measuring the thickness of a layer of pure zirconium on a zircaloy-2 base material. The pure zirconium layer is approximately 0.008" thick, and resides on the inside surface of a tube of Zr-2. We accomplish this via UT for thicker layers (0.045" to .15"), but such a thin layer seems to be a bit more than our current instrumentation can handle. I would appreciate any suggestions as to how we might be able to incorporate this into a production-type test (a given lot may consist of hundreds of 10' tubes).

It should be possible to resolve that thin inside layer by going to a sufficiently high frequency broadband transducer (at least 30MHz, preferably 50 MHz) with an appropriate pulser/receiver. Depending on what equipment you're currently using and what its bandwidth and time resolution capabilities are, this may mean purchasing a new pulser and high frequency digitizer in addition to the transducer.

--Tom Nelligan


    
 
 

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