Affiliations: [a] Department of Control and Instrumentation Engineering,
Chosun University, Gwangju, Korea | [b] KEPCO Plant Service and Engineering Co., LTD,
Gijang-Gun, Busan, Korea | [c] Department of Control and Instrumentation Engineering,
Chosun University, Gwangju, Korea | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Jinyi Lee, Department of Control and
Instrumentation Engineering, Chosun University, 501-759, Gwangju, Korea. Fax:
+82 62 230 7101; E-mail: jinyilee@chosun.ac.kr
Abstract: This paper presents a nondestructive evaluation algorithm for
locating, discriminating, and evaluating inner and outer diameter (ID and OD)
corrosion on a small-bore pipe by means of a bobbin-type magnetic camera that
uses arrayed solid-state Hall effect sensor elements for measuring alternating
magnetic fields. The proposed magnetic camera system is used to experimentally
measure artificial ID and OD hole-type cracks on a small-bore copper alloy pipe
over a low-frequency range (2–8 kHz). The measured amplitude signal is
analyzed to determine both the position and type of crack. The volumes of the
cracks are estimated with standard deviation of 0.77 mm^{3}
to be in the range 1.00–9.01 mm^{3}.
Keywords: NDE, inner and outer diameter corrosion, bobbin-type magnetic camera, hall effect sensor, heat exchanger
