太赫兹科学与电子信息学报, 2016, 14 (6): 833, 网络出版: 2017-01-23  

高分辨力亚毫米波全息成像系统

Wide-band three-dimensional submillimeter-wave holographic imaging system
作者单位
1 清华大学工程物理系, 北京 100084
2 粒子技术与辐射成像教育部重点实验室, 北京 100084
摘要
主动式毫米波成像为人体安检提供了一种安全、有效的技术手段, 对进一步提高成像分辨力和成像质量, 发展宽带高频的毫米波成像系统具有重要意义。为此建立了一个宽带高频的主动式亚毫米波全息成像系统, 其发射天线的工作频率在 280 GHz~320 GHz范围, 使用外差混频技术直接测量得到全息数据, 对其进行重建后得到目标反射率图像。同时测试了系统的工作性能, 得到了距离向和方位向分辨力以及系统的信噪比和噪声等效反射率差, 距离向分辨力小于4 mm, 方位向分辨力为 2.5 mm×2.5 mm, 均接近分辨力的理论值。此外利用该系统的宽带特性研究了带宽对毫米波全息成像的影响, 宽带成像除提高距离向分辨力外还有效地抑制了散斑效应。
Abstract
Active millimeter wave imaging provides a safe and effective technique for human security inspection. In order to further improve the imaging resolution and quality, the development of millimeter wave imaging system with wide band and high frequency is of great significance. For this purpose, an active submillimeter-wave imaging system with wide band and high frequency which utilizes a 280 GHz– 320 GHz transceiver is constructed and characterized. It uses the heterodyne mixing technique to directly get the holographic data which can be reconstructed to form the reflectivity image of object. The range and cross-range resolutions are tested as well as the signal to noise ratio of the system. The range and cross-range resolution reaches 4 mm and 2.5 mm×2.5 mm, respectively, approaching their theoretical values. The impact of bandwidth on the imaging results is also investigated benefiting from the wide-band nature of the system. Apart from increasing the range resolution, wide-band nature can also effectively suppress the speckle effect.

王子野, 乔灵博, 王迎新, 赵自然. 高分辨力亚毫米波全息成像系统[J]. 太赫兹科学与电子信息学报, 2016, 14(6): 833. WANG Ziye, QIAO Lingbo, WANG Yingxin, ZHAO Ziran. Wide-band three-dimensional submillimeter-wave holographic imaging system[J]. Journal of terahertz science and electronic information technology, 2016, 14(6): 833.

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