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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).


    
 
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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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