Terahertz time-gated spectral imaging for content extraction through layered structures.
Terahertz time-gated spectral imaging for content extraction through layered structures.
复制标题
DOI：
10.1038/ncomms12665
复制
发表时间：
2016-09-09
影响因子：
16.6
通讯作者：
Raskar, Ramesh
中科院分区：
文献类型：
--
作者：
Redo-Sanchez, Albert;Heshmat, Barmak;Aghasi, Alireza;Naqvi, Salman;Zhang, Mingjie;Romberg, Justin;Raskar, Ramesh
空间分辨率、光谱对比度和遮挡是当前成像技术对复杂样品进行无创检测的三大瓶颈。我们利用亚皮秒的时间分辨率沿着与太赫兹时域光谱提供的光谱分辨率计算提取闭塞的内容，其厚度是波长可比的层。该方法使用亚波长间隙处的反射太赫兹电场的统计数据来锁定每个层位置，然后使用时间选通光谱峰度来调整该特定层上内容的最高光谱对比度。为了证明，在没有人类监督的情况下，成功地从一堆纸页中提取了遮挡的文本内容。该方法在信号对比度上提供了一个数量级的增强，并且可以影响木制物体、塑料部件、复合材料、药物以及特别是具有亚波长或波长可比层的文物中的结构缺陷的检查。 太赫兹辐射可用于非破坏性地检测和研究材料内的缺陷和结构。在这里，作者使用太赫兹时间选通光谱成像从亚波长间隔的纸张中提取被遮挡的文本。
Spatial resolution, spectral contrast and occlusion are three major bottlenecks for non-invasive inspection of complex samples with current imaging technologies. We exploit the sub-picosecond time resolution along with spectral resolution provided by terahertz time-domain spectroscopy to computationally extract occluding content from layers whose thicknesses are wavelength comparable. The method uses the statistics of the reflected terahertz electric field at subwavelength gaps to lock into each layer position and then uses a time-gated spectral kurtosis to tune to highest spectral contrast of the content on that specific layer. To demonstrate, occluding textual content was successfully extracted from a packed stack of paper pages down to nine pages without human supervision. The method provides over an order of magnitude enhancement in the signal contrast and can impact inspection of structural defects in wooden objects, plastic components, composites, drugs and especially cultural artefacts with subwavelength or wavelength comparable layers. Terahertz radiation may be used to nondestructively detect and study defects and structures within materials. Here the authors use terahertz time-gated spectral imaging to extract occluded text from paper pages with subwavelength spacing.
登录
查看更多内容
影响因子：
1.9
作者：
Jansen, Christian;Wietzke, Steffen;Koch, Martin
通讯作者：
Koch, Martin
DOI：
10.1109/tthz.2011.2159538
发表时间：
2011-09-01
影响因子：
3.2
作者：
Jackson, J. Bianca;Bowen, John;Fukunaga, Kaori
通讯作者：
Fukunaga, Kaori
利用太赫兹反射成像中的稳态小波收缩改进脉冲响应函数的提取
影响因子：
1.8
作者：
Chen, Yang;Sun, Yiwen;Pickwell-Macpherson, Emma
通讯作者：
Pickwell-Macpherson, Emma
影响因子：
1.8
作者：
Ferguson, B;Abbott, D
通讯作者：
Abbott, D
影响因子：
1.4
作者：
Fukunaga, Kaori;Hosako, I.
通讯作者：
Hosako, I.