Inspection of Thin Copper Heat Exchanger Tubes Using SQUID-NDE System
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Published:2006-10
Issue:
Volume:321-323
Page:1425-1430
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ISSN:1662-9795
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Container-title:Key Engineering Materials
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language:
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Short-container-title:KEM
Author:
Hatsukade Yoshimi1,
Okuno Shinya1,
Mori Kazuaki2,
Tanaka Saburo1
Affiliation:
1. Toyohashi University of Technology
2. Sumitomo Light Metal Industries Ltd.
Abstract
This study is aimed at developing an eddy-current-based SQUID-NDE system for in-situ
inspection of micro flaws on thin copper heat exchanger tubes. The system employs a high
temperature superconductor (HTS-) SQUID gradiometer and a Helmholtz-coil-type inducer. As
specimens, copper tubes 6.35 mm in outer diameter and 0.8 mm in thickness with artificial surface
flaws of several tens μm in depth were inspected using the system. Magnetic response due to a flaw of
10 μm in depth on the tube moving at 32 m/min was successfully detected while applying an
excitation field of 10 μT at 3 kHz to the tube. Numerical simulations were also conducted to evaluate
how many sensors would be required for inspection around the circumference of an entire tube.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science