The application of a differential-type Hall sensors array to the nondestructive testing of express train wheels

A new and unique nondestructive testing (NDT) system able to detect a crack with high-speed and high spatial resolution, is urgently required for inspecting small cracks on express train wheels. We, in this paper, propose a scan-type magnetic camera, which uses two linearly integrated Hall sensor arrays (LIHaS) on a wafer, and a small yoke-type magnetizer, which is positioned on the back of the LIHaS. Two of the LIHaS (hereafter, differential-type LIHaS) are arrayed in parallel. The differential Hall voltages from each sensor in the scanning direction are obtained and amplified. We can achieve high-speed NDT by using the differential-type LIHaS because of the ?VH/?x value, which provides the most important crack information, can be obtained without buffering or calculation. We verified the effectiveness of this new and unique method by examination of cracks in the wheel specimen model. (A) Reprinted with permission from Elsevier.

[1]  Jae Kyoo Lim,et al.  Detection Probability Improvement for Nondestructive Evaluation Using a Magnetic Camera , 2006 .

[2]  S. R. Olsen,et al.  An in situ rapid heat–quench cell for small-angle neutron scattering , 2008 .

[3]  Tetsuo Shoji,et al.  Numerical Consideration of Magnetic Camera for Quantitative Nondestructive Evaluation , 2004 .

[4]  Jin Yi Lee,et al.  A Study of the Quantitative Nondestructive Evaluation Using the Cross Type Magnetic Source and the Magnetic Camera , 2006 .

[5]  Jinyi Lee,et al.  Nondestructive testing and crack evaluation of ferromagnetic material by using the linearly integrated hall sensor array , 2008 .

[6]  Kazuhiro Ogawa,et al.  Development of Signal Processing Circuit of a Magnetic Camera for the NDT of a Paramagnetic Material , 2007 .

[7]  Jiseong Hwang,et al.  The Qnde Using Image Processing of the Magnetic Camera , 2006 .

[8]  Jong-Woo Jun,et al.  NDT of a Nickel Coated Inconel Specimen Using by the Complex Induced Current - Magnetic Flux Leakage Method and Linearly Integrated Hall Sensor Array , 2007 .

[9]  Jiseong Hwang,et al.  Modeling of a scan type magnetic camera image using the improved dipole model , 2006 .

[10]  Hans-Martin Thomas,et al.  NDT techniques for railroad wheel and gauge corner inspection , 2004 .

[11]  Baldev Raj,et al.  Detection of leakage magnetic flux from near-side and far-side defects in carbon steel plates using a giant magneto-resistive sensor , 2008 .

[12]  Robert W. Schneider,et al.  GMR Magnetic Sensor Arrays for NDE Eddy‐Current Testing , 2003 .

[13]  Wolfgang Kappes,et al.  Application of New Front-end Electronics for Non-destructive Testing of Railroad Wheel Sets , 2007 .

[14]  Jong Woo Jun,et al.  A Study of Magnetic Charge per Unit Area of Dipole Model for the NDE , 2007 .

[15]  Z. H. Żurek,et al.  Supplementary magnetic tests for railway wheel sets , 2008 .

[16]  Jiseong Hwang,et al.  THE DETECTION PROBABILITY IMPROVEMENT OF THE FAR-SIDE CRACK ON THE HIGH LIFT-OFF USING THE MAGNETIC CAMERA , 2006 .

[17]  Stuart T. Smith,et al.  Giant magnetoresistance-based eddy-current sensor , 2001 .

[18]  Jin Yi Lee,et al.  A Study of Leakage Magnetic Flux Detector Using Hall Sensors Array , 2006 .

[19]  Ki-Hwan Kim,et al.  An Evaluation Method of Fatigue Strength and Reliability in a Railway Wheel with an Application of Strength-Stress Interference Model , 2002 .

[20]  Robert W. Schneider,et al.  Eddy‐Current Testing with GMR Magnetic Sensor Arrays , 2004 .