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http://dx.doi.org/10.5369/JSST.2018.27.5.328

Imaging Technique Based on Continuous Terahertz Waves for Nondestructive Inspection  

Oh, Gyung-Hwan (School of Mechanical Convergence Engineering, Hanyang University)
Kim, Hak-Sung (School of Mechanical Engineering, Hanyang University)
Publication Information
Journal of Sensor Science and Technology / v.27, no.5, 2018 , pp. 328-334 More about this Journal
Abstract
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.
Keywords
Continuous wave terahertz; time-domain spectroscopy; frequency sweep; oprical delay line; interferometer;
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