비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제32권3호
  • /
  • Pages.284-290
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  • 2012
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지
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Infrared Thermography Characterization of Defects in Seamless Pipes Using an Infrared Reflector

  • Park, Hee-Sang (Safety Measurement Center, Korea Research Institute of Standards and Science) ;
  • Choi, Man-Yong (Safety Measurement Center, Korea Research Institute of Standards and Science) ;
  • Park, Jeong-Hak (Safety Measurement Center, Korea Research Institute of Standards and Science) ;
  • Lee, Jea-Jung (Safety Measurement Center, Korea Research Institute of Standards and Science) ;
  • Kim, Won-Tae (Division of Mechanical and Automotive Engineering Kongju National University) ;
  • Lee, Bo-Young (School of Aerospace & Mechanical Engineering, Korea Aerospace University)
  • 투고 : 2012.05.04
  • 심사 : 2012.06.15
  • 발행 : 2012.06.30
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초록

Infrared thermography uses infrared energy radiated from any objects above absolute zero temperature, and the range of its application has been constantly broadened. As one of the active test techniques detecting radiant energy generated when energy is applied to an object, ultrasound infrared thermography is a method of detecting defects through hot spots occurring at a defect area when 15~100 kHz of ultrasound is excited to an object. This technique is effective in detecting a wide range affected by ultrasound and vibration in real time. Especially, it is really effective when a defect area is minute. Therefore, this study conducted thermography through lock-in signal processing when an actual defect exists inside the austenite STS304 seamless pipe, which simulates thermal fatigue cracks in a nuclear power plant pipe. With ultrasound excited, this study could detect defects on the rear of a pipe by using an aluminium reflector. Besides, by regulating the angle of the aluminium reflector, this study could detect both front and rear defects as a single infrared thermography image.

키워드

참고문헌

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피인용 문헌

  1. Prediction of the Effect of Defect Parameters on the Thermal Contrast Evolution during Flash Thermography by Finite Element Method vol.34, pp.1, 2014, https://doi.org/10.7779/JKSNT.2014.34.1.10