Application of thermal wave imaging and phase shifting method for defect detection in Stainless steel |
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| Institution: | 1. Department of Mechanical & Automotive Engineering, Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do 31080, South Korea;2. Center for Safety Measurement, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon, South Korea;1. School of Instrument Science and Optoelectronics Engineering, Beihang University, Beijing 100191, China;2. Laboratory of Optical Physics, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;1. Department of Engineering, Polo Scientifico Didattico di Terni, University of Perugia, Strada di Pentima 4, 05100, Terni, Italy;2. Department of Industrial and Information Engineering and Economics, University of L''Aquila, Piazzale E. Pontieri 1, 67100, Loc. Monteluco di Roio, L''Aquila, AQ, Italy;3. School of Engineering, University of Warwick, Library Road, CV4 7AL, Coventry, United Kingdom;4. Department of Electrical and Computer Engineering, Laval University, 1065, av. de la Médecine, G1V 0A6, Québec City, QC, Canada;5. Department of Informatics, Modeling, Electronics and Systems Engineering, University of Calabria, Via Pietro Bucci, 87036, Arcavacata, Rende CS, Italy;1. UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal;2. Department of Mechanical Engineering, School of Engineering, Aalto University, Puumiehenkuja 3, 02150, Espoo, Finland;1. Nondestructive Testing Research Center, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, PR China;2. Fraunhofer Institute for Nondestructive Testing IZFP, Dept. Components and Assemblies, Campus E3 1, 66123, Saarbrücken, Germany;1. Infrared Imaging Center, Department of Electronics and Communication Engineering, Koneru Lakshmaiah Educational Foundation, Vaddeswaram, A.P., India;2. Naval Materials Research Laboratory, Ambernath (E), Dist. Thane, Maharashtra, India |
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| Abstract: | This paper presents an experimental arrangement for detection of artificial subsurface defects in a stainless steel sample by means of thermal wave imaging with lock-in thermography and consequently, the impact of excitation frequency on defect detectability. The experimental analysis was performed at several excitation frequencies to observe the sample beginning from 0.18 Hz all the way down to 0.01 Hz. The phase contrast between the defective and sound regions illustrates the qualitative and quantitative investigation of defects. The two, three, four and five-step phase shifting methods are investigated to obtain the information on defects. A contrast to noise ratio analysis was applied to each phase shifting method allowing the choice of the most appropriate one. Phase contrast with four-step phase shifting at an optimum frequency of 0.01 Hz provides excellent results. The inquiry with the effect of defect size and depth on phase contrast shows that phase contrast decreases with increase in defect depth and increases with the increase in defect size. |
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| Keywords: | Subsurface defect Thermal wave imaging Phase shifting Contrast to noise ratio |
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