强激光与粒子束, 2013, 25 (6): 1545, 网络出版: 2013-04-23
三维混合域重建算法在太赫兹全息成像中的应用
Three-dimensional terahertz-wave holographic imaging based on mixed-domain reconstruction algorithm
混合域算法 后向投影 全息成像 三维成像 太赫兹成像 mixed-domain algorithm back-projection holographic imaging three-dimensional imaging terahertz imaging
摘要
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.
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.