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Terahertz time-domain spectroscopy technology has a wide range of applications in security inspection, nondestructive testing, biomedical, etc. But its application to target characteristics has been under debates, because there exist so many differences between terahertz continuous wave and ultra short pulse wave (single pulse width about 1 ps). For investigating the problem of quantitatively measuring the terahertz radar cross section, in this paper, a terahertz time domain spectroscopy scattering measurement system is built based on the technology of terahertz time domain spectroscopy. After system optimization and error minimization of location and system, time domain echoes of targets, such as sphere, disk, cylinder and complex targets, are measured. After the process of fast Fourier transformation and calibration, radar cross sections of the above-mentioned targets in a frequency range of 0.2–1.6 THz are calculated. Furthermore, the surface integral equation method and multilevel fast multipole algorithm are used to simulate the radar-cross section (RCS) results. The measured radar cross section results are compared with the simulations, and their error is less than 3 dB. The error arises mainly from the location and uneven distribution of terahertz wave on quiet zone. Generally, it is acceptable though there is still much work to do. The accuracy of RCS measurement of terahertz time domain is varified. All those are progressing in terahertz time domain spectroscopy technology used in target characteristics. Moreover, the methods of improving dynamic range in high frequency and enlarging quiet zone are the focus of follow-up studies.
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Keywords:
- terahertz /
- time-domain spectrum /
- radar cross section
[1] 李允植 著(崔万照 译) 2012 太赫兹科学与技术原理(北京: 国防工业出版社)第192页
Lee Y S (translated by Cui W Z) 2012 Principles of Terahertz Science and Technology (Beijing: National Defence Industry Press) p192 (in Chinese)
[2] 许景周, 张希成 2007 太赫兹科学技术和应用(北京: 北京大学出版社)第206页
Xu J Z, Zhang X C 2007 Applications of Terahertz Science and Technology (Beijing: Peking University Press) p206 (in Chinese)
[3] DeMartinis G B, Coulombe M J, Horgan T M, Giles R H, Nixon W E 2010 Proc. AMTA 3
[4] Goyette T M, Dickinson J C, Waldman J, Nixon W E 2000 SPIE 4053 615
[5] McGowan R W, Cheville R A, Grischkowsky D R 2000 IEEE Trans. Microwave Theory & Techn. 48 417
[6] Iwaszczuk K, Heiselberg H, Jepsen P U 2010 Opt. Express 18 26399
Google Scholar
[7] Gente R, Jansen C, Geise R, Peters O, Gente M, Krumbholz N, Möller C, Busch S, Koch M 2012 IEEE Trans. Terahertz Sci. Technol. 2 424
Google Scholar
[8] 王瑞君 2015 博士学位论文 (长沙: 国防科技大学)
Wang R J 2015 Ph. D. Dissertation (Changsha: National University of Defense Technology) (in Chinese)
[9] Cheng B B, Jiang G, Wang C, Yang C 2013 IEEE Trans. Terahertz Sci. Technol. 3 594
Google Scholar
[10] 成彬彬, 江舸, 陈鹏, 杨陈, 陆彬, 蔡英武, 邓贤进, 陈樟, 张健, 周传明 2013 太赫兹科学与电子信息学报 1 7
Cheng B B, Jiang K, Chen P, Yang C, Lu B, Cai Y W, Deng X J, Chen Z, Zhang J, Zhou C M 2013 J. Terahertz Sci. Electron. Inform. Technol. 1 7
[11] 张旭涛, 孙金海, 蔡禾, 张少华 2016 红外与激光工程 45 11
Zhang X T, Sun J H, Cai H, Zhang S C 2016 Infrared and Laser Engineering 45 11
[12] 黄培康, 殷红成, 许小剑 2005 雷达目标特性(北京: 电子工业出版社) 第21页, 第48—61页
Huang P K, Yin H C, Xu X J 2005 Radar Target Characteristics (Beijing: Publishing House of Electronics Industry)p21, pp48–61 (in Chinese)
[13] Yla-Oijala P, Taskinen M, Sarvas J 2005 Prog. Electromagn. Res. 52 81
Google Scholar
[14] Song J M, Lu C C, Chew W C 1997 IEEE Trans. Aantennas Propagat. 45 1488
Google Scholar
[15] 巩露露 2010 博士学位论文(南京: 南京理工大学)
Gong L L 2010 Ph. D. Dissertation (Nanjing: Nanjing University of Science and Technology)(in Chinese)
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图 1 太赫兹时域光谱散射测量系统光路图
Figure 1. Scattering measurement system of terahertz time domain.
图 2 目标区太赫兹波场强分布图(单位: μV)
Figure 2. Distribution of the field intensity (unit: µV).
图 3 直径50 mm金属球RCS
Figure 3. RCS of the sphere with the diameter of 50 mm.
图 4 直径20.9 mm金属圆盘RCS
Figure 4. RCS of the disk with thediameterof 20.9 mm.
图 5 金属圆柱RCS定标结果
Figure 5. RCS of the cylinder with the diameter of 20 mm and height of 20 mm.
图 6 贯穿孔结构平板实物
Figure 6. Photos of the plate with through-holes.
图 7 螺钉结构平板实物
Figure 7. RCS of the plate with screws.
图 8 螺钉结构平板时域回波
Figure 8. Time domain echo of the plate with screws.
图 9 贯穿孔结构平板RCS测量值与理论值
Figure 9. RCS of the plate with through-holes.
图 10 螺钉结构平板RCS测量值与理论值
Figure 10. RCS of the plate with screws.
表 1 不同频点处复介电常数
Table 1. Complex permittivity in different frequency.
频率/GHz 300 500 700 1000 2000 介电常数实部 –138064.3 –133443.8 –128980.3 –122568.8 –103475.4 介电常数虚部 372225.1 354601.0 337760.7 313903.6 245394.5 
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[1] 李允植 著(崔万照 译) 2012 太赫兹科学与技术原理(北京: 国防工业出版社)第192页
Lee Y S (translated by Cui W Z) 2012 Principles of Terahertz Science and Technology (Beijing: National Defence Industry Press) p192 (in Chinese)
[2] 许景周, 张希成 2007 太赫兹科学技术和应用(北京: 北京大学出版社)第206页
Xu J Z, Zhang X C 2007 Applications of Terahertz Science and Technology (Beijing: Peking University Press) p206 (in Chinese)
[3] DeMartinis G B, Coulombe M J, Horgan T M, Giles R H, Nixon W E 2010 Proc. AMTA 3
[4] Goyette T M, Dickinson J C, Waldman J, Nixon W E 2000 SPIE 4053 615
[5] McGowan R W, Cheville R A, Grischkowsky D R 2000 IEEE Trans. Microwave Theory & Techn. 48 417
[6] Iwaszczuk K, Heiselberg H, Jepsen P U 2010 Opt. Express 18 26399
Google Scholar
[7] Gente R, Jansen C, Geise R, Peters O, Gente M, Krumbholz N, Möller C, Busch S, Koch M 2012 IEEE Trans. Terahertz Sci. Technol. 2 424
Google Scholar
[8] 王瑞君 2015 博士学位论文 (长沙: 国防科技大学)
Wang R J 2015 Ph. D. Dissertation (Changsha: National University of Defense Technology) (in Chinese)
[9] Cheng B B, Jiang G, Wang C, Yang C 2013 IEEE Trans. Terahertz Sci. Technol. 3 594
Google Scholar
[10] 成彬彬, 江舸, 陈鹏, 杨陈, 陆彬, 蔡英武, 邓贤进, 陈樟, 张健, 周传明 2013 太赫兹科学与电子信息学报 1 7
Cheng B B, Jiang K, Chen P, Yang C, Lu B, Cai Y W, Deng X J, Chen Z, Zhang J, Zhou C M 2013 J. Terahertz Sci. Electron. Inform. Technol. 1 7
[11] 张旭涛, 孙金海, 蔡禾, 张少华 2016 红外与激光工程 45 11
Zhang X T, Sun J H, Cai H, Zhang S C 2016 Infrared and Laser Engineering 45 11
[12] 黄培康, 殷红成, 许小剑 2005 雷达目标特性(北京: 电子工业出版社) 第21页, 第48—61页
Huang P K, Yin H C, Xu X J 2005 Radar Target Characteristics (Beijing: Publishing House of Electronics Industry)p21, pp48–61 (in Chinese)
[13] Yla-Oijala P, Taskinen M, Sarvas J 2005 Prog. Electromagn. Res. 52 81
Google Scholar
[14] Song J M, Lu C C, Chew W C 1997 IEEE Trans. Aantennas Propagat. 45 1488
Google Scholar
[15] 巩露露 2010 博士学位论文(南京: 南京理工大学)
Gong L L 2010 Ph. D. Dissertation (Nanjing: Nanjing University of Science and Technology)(in Chinese)
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