The Estimation of Defect of Mono Cast Nylon by Infrared Thermography

J. Ocean Eng. Technol. 2009;23(2):81-86.

Han Jeong-Seb

Dept. of Materials Science and Engineering DonA Univ.

열화상 기술에 의한 M.C 나일론의 내부 결함에 대한 평가

한정섭

동아대학교 신소재공학과

Keywords: Infrared thermography, Defect depth, Non-destructive testing, The full width at half of the maximum contrast, Mono cast nylon

핵심용어: 적외선 열화상, 결함의 깊이, 비파괴시험, 반치폭, 엠씨 나일론

Abstract

Infrared thermography was used to determine the location, size, and depth of defects under the surface of M.C nylon. Defects were created in a specimen by back-drilling circular holes. These defects were located at the maximum temperature difference that occurred. The sizes of the defects could be calculated by means of the full width at half of the maximum temperature difference. The depth of a defect could be calculated by the peak time and the maximum temperature difference. The maximum temperature difference between a defect and normal part was decreased with the depth of the defect. And the peak time also slowly appeared with the depth of the defect.