비파괴검사를 위한 연속형 테라헤르츠 파 기반의 영상화 기술
Imaging Technique Based on Continuous Terahertz Waves for Nondestructive Inspection
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
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 imag- ing systems is reported. The CW–THz imaging system is a simple, fast, compact, and relatively low-cost system. However, it only pro- vides intensity data, without depth and frequency- or time-domain information. The pulsed THz imaging system yields a broader rangeof information, but it is expensive because of the femtosecond laser. Recently, to overcome the drawbacks of CW–THz imaging sys-tems, many studies have been conducted, including a study on the QTDS system. In this system, an optical delay line is added to theoptical 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 sys- tems for nondestructive inspection was confirmed.
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 imag- ing systems is reported. The CW–THz imaging system is a simple, fast, compact, and relatively low-cost system. However, it only pro- vides intensity data, without depth and frequency- or time-domain information. The pulsed THz imaging system yields a broader rangeof information, but it is expensive because of the femtosecond laser. Recently, to overcome the drawbacks of CW–THz imaging sys-tems, many studies have been conducted, including a study on the QTDS system. In this system, an optical delay line is added to theoptical 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 sys- tems for nondestructive inspection was confirmed.
참고문헌 (15)
- A. Ditali, "X-ray inspection-induced latent damage in DRAM", Reliab. Phys. Symp. Proc., 2006. 44th Ann., pp.266~269 (2006), IEEE Int., IEEE
- G.-M. Zhang, "Microelectronic package characterisation using scanning acoustic microscopy", NDT E Int., 40(8), pp.609~617 (2007)[DOI]
- R. Zoughi, "Real-time and on-line near-field microwave inspection of surface defects in rolled steel", Microw. Conf. Proc., 3(xx), pp.1081~1084 (1997)
- B. S. Ferguson, "In vitro osteosarcoma biosensing using THz time domain spectroscopy", Int. Soc. Opt. Photonics, 5275(xx), pp.304~317 (2004)
- M. Yamashita, "Component spatial pattern analysis of chemicals by use of two-dimensional electro-optic terahertz imaging", Appl. opti., 44(25), pp.5198~5201 (2005)[DOI]
- K. McClatchey, "Time resolved synthetic aperture terahertz impulse imaging", Appl. phys. lett., 79(27), pp.4485~4487 (2001)[DOI]
- N. Karpowicz, "Comparison between pulsed terahertz time-domain imaging and continuous wave terahertz imaging", Semicond. Sci. Technol., 20(xx), pp.293~299 (2005)[DOI]
- C. H. Ryu, "Nondestructive evaluation of hidden multi-delamination in a glass-fiber-reinforced plastic composite using terahertz spectroscopy", Compos. Struct., 156(xx), pp.338~347 (2016)[DOI]
- M. Usami, "Development of a THz spectroscopic imaging system", Phys. Med. Biol., 47(21), pp.3749~3753 (2002)[DOI]
- M. Scheller, "Terahertz quasi time domain spectroscopy", Opt. Express, 17(20), pp.17723~17733 (2009)[DOI]
- R. B. Kohlhaas, "Terahertz quasi time-domain spectroscopy based on telecom technology for 1550 nm", Opt. Express, 25(11), pp.12851~12859 (2017)[DOI]
- J. S. Yahng, "High-speed frequency-domain terahertz coherence tomography", Opt. Express, 24(2), pp.1053~1061 (2016)[DOI]
- Y. Wang, "Continuous-wave terahertz phase imaging using a far-infrared laser interferometer", Appl. opt., 50(35), pp.6452~6460 (2011)[DOI]
- F. P. Mezzapesa, "Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers", IEEE Trans. Terahertz Sci. and Technol., 4(5), pp.631~633 (2014)[DOI]
- X. Wang, "Continuous-wave terahertz interferometry with multiwavelength phase unwrapping", Appl. opt., 49(27), pp.5095~5102 (2010)[DOI]