线阵式探测器连续太赫兹波层析成像技术

Continuous terahertz wave tomography with linear array detector

太赫兹波层析成像技术是利用太赫兹波对包括人体的样品无害的穿透性进行投影成像并采集产生的数据,通过重建算法获得样品的二维截面图的重构。设计并搭建了基于线阵式探测器的连续太赫兹波成像系统且该系统设备复杂度和硬件成本较低,通过采集不同角度的太赫兹透射成像线阵,得到了待测样品的太赫兹扫描图像,利用滤波反投影算法重建待测样品的二维横截面图。实验结果显示,搭建的系统能够对成像面积为143 mm×143 mm的样品实现层析成像,单次成像时间3分钟;与传统的面阵式探测器连续太赫兹波层析成像系统相比,成像范围增加了459%,成像时间减少了80%。进一步探索了基于线阵式探测器的连续太赫兹波层析成像技术在无损检测和安全检测上的可行性。

Terahertz wave tomography technology is to use terahertz wave to perform projection imaging on harm-less penetrability of samples including human body and collect the generated data.On this basis,it obtains the recon-struction of the two-dimensional cross-section of the sample through the reconstruction algorithm.In this paper,a continuous THz wave imaging system based on linear array detector is designed and built,which has low equipment complexity and hardware cost.By collecting the terahertz transmission imaging linear array from different angles,the terahertz scanning images of the samples to be tested are obtained.Then the two-dimensional cross-sectional images of the samples to be tested are reconstructed by the filtered back projection algorithm.The experimental results show that the system built in this paper can realize tomographic imaging for the sample with the imaging area size of 143 mm×143 mm,and the single imaging time is 3 minutes.The imaging range is increased by 459%and the imaging time is re-duced by 80%compared with the traditional planar array detector continuous THz tomography system.The feasibility of continuous THz wave tomography based on linear array detector in nondestructive testing and safety testing is further explored.