2.52THz离轴数字全息成像和焦平面成像特性比较  

Comparison between 2.52 THz Off-Axis Digital Holography and Focal-Plane Imaging

作　　者：李琦[1] 丁胜晖[1] 李运达[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学可调谐激光技术国家级重点实验室,黑龙江哈尔滨150081

出　　处：《中国激光》2012年第9期172-177,共6页Chinese Journal of Lasers

基　　金：高等学校博士学科点专项科研基金(20112302110028)资助课题

摘　　要：利用已搭建的2.52THz焦平面成像装置和离轴数字全息装置,通过分辨率测量和水印及铅笔字成像,研究了焦平面成像和离轴数字全息成像这两种面阵成像的性能。实验证明,常规的焦平面成像由于太赫兹波长较长,很难获得较高的成像分辨率,且成像效果受放置位置的影响严重;太赫兹离轴数字全息成像可以提高成像分辨率,但成像物体大小受系统分辨率制约;焦平面成像较离轴面阵数字全息成像更适于大目标低分辨率成像。Performance of focal-plane imaging and off-axis digital holography is studied by the way of the resolution measurement and imaging of watermark and words in pencil with the built 2.52 THz focal-plane imaging and off-axis digital holographic devices. The results validate that the common focal-plane imaging can not achieve relatively high resolution because of the long wavelength of terahertz. The imaging quality is determined by the placed position. Terahertz off-axis digital hologram can improve the resolution of the imaging system; however, the imaging object size is limited by the system resolution. It can be inferred that the focal-plane imaging is more suitable for large object and low resolution imaging.

关 键 词：成像系统 太赫兹成像 数字全息 焦平面成像 

分 类 号：TN29[电子电信—物理电子学]