光学
太赫兹辐射
散射
材料科学
图像分辨率
共焦
物理
斑点图案
光散射
极化(电化学)
光学相干层析成像
合成孔径雷达
显微镜
作者
Zhan Ou,Jiamin Wu,Geng Hua,Deng Xiaojiao,Xiaoping Zheng
出处
期刊:Optics Express
[The Optical Society]
日期:2020-04-13
卷期号:28 (8): 12405-12415
被引量:2
摘要
Terahertz (THz) radar imaging has gained great interests in various applications due to its capability of deep penetration in some specific contents such as plastic and non-conductive materials without water. However, the image quality would be highly degraded by the scattering of the rough surfaces, which remains a challenge in the area. Here, we propose a confocal terahertz synthetic aperture radar (SAR) to alleviate the scattering issues with both improved signal-to-noise ratio (SNR) and resolution. Inspired by the confocal non-line-of-sight imaging in visible wavelength, a convex lens is added into the conventional SAR system to localize the effect of scattering within each spatial sampling point by the confocal configuration. Then, the random phase aberration caused by scattering could be corrected through a simple shift in temporal domain. The performance of the proposed method under different roughness occlusions is evaluated through experiments. All the results demonstrate great enhancements in both resolution and SNR over the conventional methods.
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