Liting Niu 1, 2, Kejia Wang 1, Zhengang Yang 1, Jinsong Liu 1*
1 Huazhong University of Science and Technology, Wuhan national laboratory for optoelectronics, No. 1037 Luoyu Rd., Wuhan, Hubei, China
2 Guangdong University of Petrochemical Technology, College of Science, No.139 Guandu 2nd Rd., Maoming, Guangdong, China
*1 Email: jsliu4508@vip.sina.com
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Abstract: Terahertz (THz) imaging has greatly progressed over the past two decades because of the advantages of penetrativity, lower optical phantom and broadband. In this paper, we mainly introduce THz computed tomography (CT) and THz time-of-flight (TOF) imaging. Specially, the development of these two kinds of imaging techniques could be classified to some branches. One important branch is reducing the data acquisition time by 2D free-space electro-optic sampling (2D-FSEOS), asynchronous optical sampling (ASOPS) or electronically controlled optical sampling (ECOPS). Another important branch is enhancing the image resolution and quality by optimized reconstruction algorithms. The image quality also could be improved by considering Gaussian beam propagation or replacing the Gaussian beam by a zero-order Bessel beam. Moreover, application investigations of THz CT and THz TOF imaging in different fields such as art conservation, medicine detection, defect identification, industrial inspection are demonstrated and summarized.
Keywords: Terahertz spectral computed tomography, Terahertz continuous-wave computed tomography, Terahertz time-of flight imaging.
Received: 2019-9-18
Published: 2019-9-30
Cite this article:
Liting Niu, Kejia Wang, Zhengang Yang, and Jinsong Liu; Terahertz tomography [J]. International Journal of Terahertz Science and Technology, 2019, Vol.12, No.3: 77-92. DOI:10.11906/TST.077-092.2019.09.08
URL: http://www.tstnetwork.org/10.11906/TST.077-092.2019.09.08
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