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Determination of Lock-in Frequency in Accordance with Material of Target for Defect Measuring by Lock-in Mid-IR Thermography

위상잠금 중파장 적외선 열화상 기법에 의한 결함 계측에서 측정 대상체의 재질에 따른 위상잠금 주파수 연구

  • Park, Il-Chul (Dept. of Mechanical System & Automotive Engineering, Graduate School, Chosun UNIV.) ;
  • Kim, Sang-Chae (Dept. of Mechanical System & Automotive Engineering, Graduate School, Chosun UNIV.) ;
  • Lee, Hang-Seo (Dept. of Mechanical System & Automotive Engineering, Graduate School, Chosun UNIV.) ;
  • Kim, Han-Sub (Dept. of Mechanical System & Automotive Engineering, Graduate School, Chosun UNIV.) ;
  • Jung, Hyun-Chul (Dept. of Convergence Automotive Engineering, Graduate School of Industry Technology Convergence, Chosun UNIV.) ;
  • Kim, Kyeong-Suk (Dept. of Mechanical System & Automotive Engineering, Chosun UNIV.)
  • 박일철 (조선대학교 일반대학원 기계시스템미래자동차공학과) ;
  • 김상채 (조선대학교 일반대학원 기계시스템미래자동차공학과) ;
  • 이항서 (조선대학교 일반대학원 기계시스템미래자동차공학과) ;
  • 김한섭 (조선대학교 일반대학원 기계시스템미래자동차공학과) ;
  • 정현철 (조선대학교 산업기술융합대학원 융합자동차공학과) ;
  • 김경석 (조선대학교 기계시스템미래자동차공학부)
  • Received : 2019.07.23
  • Accepted : 2019.08.05
  • Published : 2019.09.30

Abstract

Three types of samples with defects were measured by lock-in med-IR (infrared) thermography with various lock-in frequencies for different materials. The lock-in method can be used to detect defects when an external energy source is applied to the object, the non-uniformity of the incident thermal energy distribution is eliminated, and the camera's measurement cycle is synchronized with the load cycle of the incident energy source. For inspecting samples with defects, results of thermal images are analyzed when three types of materials, i.e., SM45C, STS316L, and AL6061 are tested and three lock-in frequencies, i.e., 0.08, 0.1, and 0.12 Hz are applied. In this study, the optimal lock-in frequencies were determined by comparing the results of each material and lock-in frequency measured using the mid-IR camera.

Keywords

References

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