Abstract
Abstract Active thermography techniques have the capability of inspecting a broad range simultaneously. Byevaluating the phase difference between the defected area and the healthy area, the technique indicates thequalitative location and size of the defect. Previously, the development of the defect detection method used avariety of materials and the test specimen was done. In this study, the proposed technique of lock-in is verifiedwith artificial specimens that have different size and depth of subsurface defects. Finally, the defect detectioncapability was evaluated using comparisons of the phase image and the amplitude image according to the size anddepth of defects. Keywords: Lock-in, Infrared Thermography, Defects Detection, Data Processing, Thermal Imaging[Received: May 12, 2015, Revised: June 16, 2015, Accepted: June 17, 2015] * , **공주대학교대학원기계공학과 공주대학교 공과대학 기계자동차공학부, Corresponding Author: Div. of Mechanical and Automotive Engineering,Kongju National University, Cheonan, Chungnam, 331-717, Korea (E-mail: kwt@kongju.ac.kr)
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