三维混合域重建算法在太赫兹全息成像中的应用

提出了一种三维混合域重建算法，该算法在垂直方位向采用空间波数域匹配滤波，结合距离水平方位域后向投影技术完成目标三维重建。与三维波数域算法相比，该算法不仅避免了复杂的三维Stolt插值，还继承了后向投影技术便于处理运动补偿的优点。相比传统的三维时域后向投影算法，该算法通过在垂直方位向的波数域处理，运算量显著减少。通过对0.2 THz波段仿真和实验数据的重建，验证了算法的正确性和有效性。(1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;2. Key Laboratory of Electromagnetic Radiation and Sensing Technology,Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Science, Beijing 100190, China)Abstract:Key words:

Abstract

A three-dimensional (3-D) image reconstruction algorithm based on mixed-domain is developed for terahertz holographic imager. Matched filtering in the spatial wave-number domain is employed to focus images in the vertical direction. Combined with back-projection technique used in the other two directions, the algorithm can focus images perfectly without complex 3-D Stolt interpolation computation compared with the frequency-wavenumber algorithm. Besides, motion compensations in the horizontal and range directions get easier to handle. The computational cost of the proposed algorithm is lower than the traditional 3-D back-projection algorithm owing to the FFT-based reconstruction in the vertical direction. Finally, some simulation and experimental imaging results are given in the 0.2 THz band to validate the algorithm.

参考文献

[1] Berrah N, Fang L, Osipov T, et al. Ultraintense X-ray induced multiple ionization and double core-hole production in molecules［C］//Conference on Lasers and Electro-Optics. 2011: 1-2.

[2] Cull C F, Wikner D A, Mait J N, et al. Millimeter-wave compressive holography［J］. Appl Opt, 2010, 49(19): 67-82.

[3] Krozer V, Lffler T, Dall J, et al. Terahertz imaging systems with aperture synthesis techniques［J］. IEEE Trans on Microwave Theory and Techniques, 2010, 58(7): 2027-2039.

[4] Gu S, Li C, Gao X, et al. Terahertz aperture synthesized imaging with fan-beam scanning for personnel screening［J］. IEEE Trans on Microwave Theory and Techniques, 2012, 60(12): 3877-3885.

[5] Sheen D M, McMakin D L, Hall T E. Three-dimensional millimeter-wave imaging for concealed weapon detection［J］. IEEE Trans on Microwave Theory and Techniques, 2001, 49(9): 1581-1591.

[6] Jackson J B, Bowen J, Walker G, et al. A survey of terahertz applications in cultural heritage conservation science［J］. IEEE Trans on Terahertz and Technology, 2011, 1(1): 220-231.

[7] Sheen D M, Hall T E, Severtsen R H, et al. Active wideband 350 GHz imaging system for concealed-weapon detection［C］//Proc of SPIE. 2009: 73090I.

[8] Gao X, Li C, Gu S, et al. Study of a new millimeter-wave imaging scheme suitable for fast personal screening［J］. IEEE Antennas and Wireless Propagation Lett, 2012, 11: 787-790.

[9] Qian S, Zhao Y, Redo-Sanchez A, et al. Fast continuous terahertz wave imaging system for security［J］. Opt Commun, 2009, 282: 2019-2022.

[10] Gao X, Li C, Gu S, et al. Design, analysis and measurement of a millimeter wave antenna suitable for stand off imaging at checkpoints［J］. Journal of Infrared, Millimeter and Terahertz Waves, 2011, 32(11): 1314-1327.

[11] Hay S G, Archer J W, Timms G P, et al. A beam-scanning dual-polarized fan-beam antenna suitable for millimeter wavelengths［J］. IEEE Trans on Antennas and Propagation, 2005, 53(8): 2516-2524.

谷胜明, 李超, 高翔, 孙兆阳, 方广有. 三维混合域重建算法在太赫兹全息成像中的应用[J]. 强激光与粒子束, 2013, 25(6): 1545. Gu Shengming, Li Chao, Gao Xiang, Sun Zhaoyang, Fang Guangyou. Three-dimensional terahertz-wave holographic imaging based on mixed-domain reconstruction algorithm[J]. High Power Laser and Particle Beams, 2013, 25(6): 1545.

三维混合域重建算法在太赫兹全息成像中的应用

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