太赫兹干涉成像原理简单, 需要的探测单元少, 数据获取效率高, 在太赫兹成像应用中有很大发展潜力。研究了太赫兹干涉成像的原理, 并设计了用于仿真成像的原理性方案。通过仿真实验分析了成像频率、圆周阵列半径、阵元数目对成像质量的影响以及成像系统的频率带宽。结果表明: 在其他条件不变的情况下, 成像频率越高, 可有效成像要求的阵列半径越小; 增加阵元数目可提高成像质量, 但增加到一定数量后, 提高不明显; 均匀圆形阵列的有效成像带宽较宽。仿真结果所得到的结论为太赫兹干涉成像系统设计和实际应用提供了理论依据和技术支持。

Terahertz interferometric imaging offers considerable potential in many imaging applications due to its simple imaging principle, less detector elements and efficient data acquiring ratio. An interferometric imaging system scheme was proposed based on the research of Terahertz interferometric imaging principle. Simulation experiments were carried out to analyze the impact of imaging frequency, radius of circular array and detector number on imaging quality and frequency bandwidth of the imaging system. The experimental results show that the radius of circular array is smaller while the frequency is higher for available imaging with the other conditions being changeless. Adding detector number would improve the imaging quality but not obvious while bigger than one certain number and the frequency bandwidth of uniform circular array for available imaging is wide. The conclusions from the simulation results may offer some theoretic evidence and technical support for the design of terahertz interferometric imaging system and practical applications.