太赫兹主动关联成像技术研究

Research on the Terahertz Active Ghost Imaging Technology

研究了一种基于主动关联成像方式的太赫兹成像系统,可利用一个太赫兹单点探测器实现目标的高速、高分辨二维成像,突破了太赫兹器件的分辨率限制。该系统采用双调幅板旋转方式产生可重复使用的测量矩阵,大幅提高了成像速度。通过数值模拟给出了成像距离、调幅板随机图形尺寸、采样次数、采样矩阵相关性等参数对成像结果的影响,得到最佳实验参数,并优化了双调幅板的运动策略。搭建的太赫兹主动关联成像实验装置采用波长为3mm的太赫兹源,实验证明其成像分辨率为4mm,且成像时间由调幅板的电机转速决定,证实了此种太赫兹成像方式的可行性。

A terahertz imaging system based on active ghost imaging method is proposed.The system can achieve high speed and high resolution imaging using one single-pixel detector,breaking through the resolution limit of terahertz devices.Reusable measurement matrix is obtained by the rotation of double random amplitude plates so that the imaging speed is greatly improved.The influence of imaging distance,size of random pattern,sampling number and the relativity of sampling matrix on imaging quality are numerically analyzed.The best parameters are used for experiment.And the motion strategy of double amplitude plates is optimized.Experimental results show that the imaging resolution is 4 mm when the wavelength of terahertz source is 3 mm,and imaging speed is determined by the motor of amplitude plates.The feasibility of terahertz active ghost imaging method is proved.