Paper Title:
Inspection of Thin Copper Heat Exchanger Tubes Using SQUID-NDE System
  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.

  Info
Periodical
Key Engineering Materials (Volumes 321-323)
Edited by
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi
Pages
1425-1430
DOI
10.4028/www.scientific.net/KEM.321-323.1425
Citation
Y. Hatsukade, S. Okuno , K. Mori, S. Tanaka, "Inspection of Thin Copper Heat Exchanger Tubes Using SQUID-NDE System", Key Engineering Materials, Vols. 321-323, pp. 1425-1430, 2006
Online since
October 2006
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Price
$32.00
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