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Chao Li 1, 2*, and GuangYou Fang 1, 2
1 The Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, BeiJing, China
2 Institute of Electronics, Chinese Academy of Sciences, BeiJing, China
*2 Email: cli@mail.ie.ac.cn
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Abstract: Terahertz (THz) wave has unique properties due to its special position in the electromagnetic spectrum, which lies in the gap between the electronics and photonics. In recent years, imaging and sensing with EM radiation in Terahertz band has aroused considerable interests and is found to be promising for plenty of applications, such as security and safety screening, process monitoring and non-destructive materials testing. Besides being limited by the maturity of electronic components, design and realization of imaging systems at THz band with high performance is a complex issue which is dependent on variety of key parameters such as spatial resolution, sensitivity, target contrast, target identification, and so on. This paper describes and summarizes some background on THz imaging, and the recent progress on the research of THz imaging and sensing at Institute of Electronics, Chinese Academy of Sciences, both in theoretical and some system engineering aspects. The imaging scheme and reconstruction algorithm with synthesized aperture concept was extended to THz band. The relationships between the image qualities and the parameters of quasi-optical transceivers were quantitatively evaluated for the guidance of system development. Some novel THz imaging concepts based on sparse information were also introduced, such as the single frequency adaptive focusing with minimum-entropy (ME) method, and THz surface layer reconstruction with sparse random step frequency. Based on the combination of the synthesized aperture concept, the novel beam scanning method, and THz frequency modulated continuous wave (FMCW) transceiver, three-dimensional (3D) imaging radar in sub-THz band with real-time capability was developed, which has potential applications for security screen.
Keywords: Terahertz imaging, Security, Reconstruction algorithm, Synthesized aperture technique, Beam scanning
Received: 2015-8-18
Published: 2016-3-30
Cite this article:
Chao Li, and GuangYou Fang. Terahertz imaging for security – algorithm and system realization[J]. International Journal of Terahertz Science and Technology, 2016, Vol.9, No.1: 19-36. DOI:10.11906/TST.019-036.2016.03.03
URL: http://www.tstnetwork.org/10.11906/TST.019-036.2016.03.03
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