센서학회지 (Journal of Sensor Science and Technology)

  • 제27권5호
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  • Pages.328-334
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  • 2018
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  • 1225-5475(pISSN)
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  • 2093-7563(eISSN)
한국센서학회 (The Korean Sensors Society)
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비파괴검사를 위한 연속형 테라헤르츠 파 기반의 영상화 기술

Imaging Technique Based on Continuous Terahertz Waves for Nondestructive Inspection

  • 오경환 (한양대학교 융합기계공학부) ;
  • 김학성 (한양대학교 기계공학부)
  • Oh, Gyung-Hwan (School of Mechanical Convergence Engineering, Hanyang University) ;
  • Kim, Hak-Sung (School of Mechanical Engineering, Hanyang University)
  • 투고 : 2018.07.04
  • 심사 : 2018.09.10
  • 발행 : 2018.09.30
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초록

The paper reviews an improved continuous-wave (CW) terahertz (THz) imaging system developed for nondestructive inspection, such as CW-THz quasi-time-domain spectroscopy (QTDS) and interferometry. First, a comparison between CW and pulsed THz imaging systems is reported. The CW-THz imaging system is a simple, fast, compact, and relatively low-cost system. However, it only provides intensity data, without depth and frequency- or time-domain information. The pulsed THz imaging system yields a broader range of information, but it is expensive because of the femtosecond laser. Recently, to overcome the drawbacks of CW-THz imaging systems, many studies have been conducted, including a study on the QTDS system. In this system, an optical delay line is added to the optical arm leading to the detector. Another system studied is a CW-THz interferometric imaging system, which combines the CW-THz imaging system and far-infrared interferometer system. These systems commonly obtain depth information despite the CW-THz system. Reportedly, these systems can be successfully applied to fields where pulsed THz is used. Lastly, the applicability of these systems for nondestructive inspection was confirmed.

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참고문헌

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