Authors: Jinyi Lee Jiseong Hwang Jongwoo Jun Seho Choi
Publish Date: 2008/12/01
Volume: 22, Issue: 12, Pages: 2310-
Abstract
Magnetic flux leakage testing MFLT which measures the distribution of a magnetic field on a magnetized specimen by using a magnetic sensor such as a Hall sensor is an effective nondestructive testing NDT method for detecting surface cracks on magnetized ferromagnetic materials A scantype magnetic camera based on the principle of MFLT uses an inclined Hall sensor array on a printed circuit board PCB to detect small cracks at high speed However the wave forms appear in a direction perpendicular to the scan because the sensors are bonded at different gradients and heights on the PCB despite careful soldering In this paper we propose linearly integrated Hall sensors LIHaS on a wafer to minimize these waves and to improve the probability of crack detection A billet specimen is used to determine the effectiveness of the LIHaS in multiple crack detectionProf Jinyi Lee was born in Korea in 1968 He received the bachelor degree in mechanical design from Chonbuk University Jeonju Korea in 1992 Also he received the master and PhD degree in mechanical and aeronautics space engineering from Tohoku university Sendai Japan in 1995 and 1998 respectively He was a Researcher from 1998 to 2000 with the Tohoku university Iwate university Iwate TechnoFoundation and Saitama university Japan From 2000 to 2003 he worked for Lacomm Co Ltd and Gloria Techniques Korea as a researcher In 2003 he was a lecturer with the Chosun university Gwangju Korea Since 2005 he has been an Assistance Professor Chosun university His research interests are in application of magnetooptical film laser and CCD line scan sensor and development of magnetic camera He is the author or coauthor of fifteen patents and over 50 scientific papersJiseong Hwang was born in Republic of Korea in 1979 He received the BS and MS degree in control and instrumentation engineering in 2005 and 2006 respectively from the Chosun University Gwangju korea where he is currently working toward the PhD degree His research interests are NDT and Evaluation Magnetic cameraJongwoo Jun was born in Korea in 1974 He received the bachelor degree in electronics engineering from Inje University Kimhae Korea in 1999 He received the master degree in electronics engineering from Changwon University Changwon Korea in 2005 Also he is currently working toward the PhD degree in information communication engineering from Chosun University Gwangju Korea He worked for Lacomm Co Ltd and Gloria Techniques from 1999 to 2005 Korea as a researcher His research interests are development of magnetic camera NDT and evaluationDr Seho Choi was born in Korea in 1964 He received bachelor degree in the department of electrical and electronic engineering from Kyungpook National University Daegu Korea in 1987 And he received master degree in the department of elec trical and electronic engineering from Korea Advanced Institute of Science and Technology in 1989 He received PhD degree in the department of electrical and electronic engineering from the University of Sheffield in the UK in 2001 He had been worked for Agency for Defense Development as a Researcher from 1989 to 1992 Korea Since 1993 he has been worked for POSCO Research Lab as a principal researcher His main research activities are developing Surface Defect Inspection System for hot and cold rolled steel strip hot wire rod and hot slab He is also interested in developing Internal Defect Detection System for steel products by using Ultrasonic and magnetic camera techniques His major is image processing to detect tiny defect in high background noise image He published many scientific papers as the author or coauthor
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