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http://dx.doi.org/10.14775/ksmpe.2019.18.9.044

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

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.)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.18, no.9, 2019 , pp. 44-51 More about this Journal
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
Lock-in Frequency; IR Thermography; Defect Measurement; Med-infrared; Material of Target;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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