Diffuse terahertz spectroscopy in turbid media using a wavelet-based bimodality spectral analysis.
Diffuse terahertz spectroscopy in turbid media using a wavelet-based bimodality spectral analysis.
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DOI：
10.1038/s41598-021-02068-7
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发表时间：
2021-11-23
影响因子：
4.6
通讯作者：
Arbab MH
中科院分区：
文献类型：
--
作者：
Khani ME;Osman OB;Arbab MH
目前的太赫兹光谱技术仅使用相干光束进行光谱成像。然而，在存在电磁散射的情况下，散射减轻的非相干光束允许灵活的发射器-检测器几何形状，这使得能够实现诸如看穿混浊介质的应用。尽管有这种潜力，使用漫射波的太赫兹光谱尚未得到证实。主要障碍是扩散场的非常差的信噪比和由于模糊材料吸收特征的多个米氏散射事件而导致的共振状光谱伪影。在这项工作中，我们展示了通过混浊介质的非均匀样品的漫射太赫兹光谱，使用一种新的技术，基于小波多分辨率分析和双峰系数谱，我们在这里定义的第一次使用的偏度和峰度的光谱图像。所提出的方法在相对于入射光束高达90°的检测角下产生宽带和同时的材料表征。我们确定的准确性，基于小波的漫反射光谱在倾斜的检测角度，通过评估下的接收器工作特性曲线的面积，高于95%。这种技术是不可知的任何先验信息的光谱特征的样品材料或散射介质的特性，并可以扩展为其他宽带光谱模态。
Current terahertz (THz) spectroscopy techniques only use the coherent light beam for spectral imaging. In the presence of electromagnetic scattering, however, the scattering-mitigated incoherent beams allow for flexible emitter-detector geometries, which enable applications such as seeing through turbid media. Despite this potential, THz spectroscopy using diffuse waves has not been demonstrated. The main obstacles are the very poor signal to noise ratios of the diffused fields and the resonance-like spectral artifacts due to multiple Mie scattering events that obscure the material absorption signatures. In this work, we demonstrate diffuse THz spectroscopy of a heterogeneous sample through turbid media using a novel technique based on the wavelet multiresolution analysis and the bimodality coefficient spectrum, which we define here for the first time using the skewness and kurtosis of the spectral images. The proposed method yields broadband and simultaneous material characterization at detection angles as high as 90° with respect to the incident beam. We determined the accuracy of the wavelet-based diffuse spectroscopy at oblique detection angles, by evaluating the area under the receiver operating characteristic curves, to be higher than 95%. This technique is agnostic to any a priori information on the spectral signatures of the sample materials or the characteristics of the scattering medium, and can be expanded for other broadband spectroscopic modalities.
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DOI：
10.1364/josaa.14.000192
发表时间：
1997-01-01
影响因子：
1.9
作者：
Boas, DA;Yodh, AG
通讯作者：
Yodh, AG
影响因子：
10.4
作者：
Aghasi, Alireza;Heshmat, Barmak;Raskar, Ramesh
通讯作者：
Raskar, Ramesh
影响因子：
4
作者：
Franz, Morten;Fischer, Bernd M.;Walther, Markus
通讯作者：
Walther, Markus
影响因子：
8.6
作者：
BOAS, DA;CAMPBELL, LE;YODH, AG
通讯作者：
YODH, AG
影响因子：
35
作者：
Katz, Ori;Heidmann, Pierre;Gigan, Sylvain
通讯作者：
Gigan, Sylvain