3D Terahertz Synthetic Imaging and Reflection Spectroscopy

3D 太赫兹合成成像和反射光谱

• 批准号: 1231783
• 负责人: James McNames
• 金额: $ 30万
• 依托单位: Portland State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-01 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1231783&HistoricalAwards=false
• 关键词: 3D; Terahertz; Synthetic; Imaging; Reflection

Intellectual MeritsTerahertz (THz) sensing is emerging as a promising new technology with application to a wide number of compelling problems in material probing, medical imaging, and device design. This tremendous potential has prompted rapid advancements in THz sensor technology, but advanced processing approaches that exploit the unique capability of THz sensors are still not fully developed. Perhaps the most promising application, three-dimensional (3D) THz imaging with simultaneous chemical characterization, has remained elusive due to challenges posed by the unique geometries of THz imaging configurations and the subsequent scattering of THz waves. A core contribution of this research will be the development of advanced physics-based signal processing techniques for 3D imaging with concurrent spectroscopic material characterization. These techniques are based on predictions of electromagnetic scattering theory (for example, reflection from planar cracks and curved layers) to preferentially combine reflection measurements from multiple sensors, frequencies and polarizations. This work will produce methods for advanced 3D focusing of Synthetic Aperture Imaging systems with the simultaneous detection of spectroscopic material features from THz reflection spectra. While this work will provide advances in specific THz sensing applications, the need to understand and exploit wave interactions with physics-based processing has wide applicability, and the integrated theoretical, modeling and measurement effort proposed will significantly advance knowledge in the field. Broader ImpactsThis research will support an integrated activity of research and education at Portland State University in collaboration with international academic and industry partners. The potential societal benefits are truly impressive, potentially enabling the ability for rapid and robust 3D chemical mapping for future industry applications in non-destructive evaluation, medical imaging, and security screening. This research will specifically target two imaging applications: 1) rapid assessment of the shape and material composition of coated pharmaceutical tablets; and 2) detection of cracks in solar panels for enhanced production of ?green? energy. In addition to these broader impacts of the work, undergraduate and graduate students will have the opportunity to engage in cutting-edge THz research and participate in the international collaboration. The PI will continue her activities of K-12 outreach and mentoring of women in science and engineering.

太赫兹（THz）传感是一种新兴的有前途的新技术，应用于材料探测，医学成像和设备设计中的许多引人注目的问题。这种巨大的潜力促进了THz传感器技术的快速发展，但利用THz传感器独特能力的先进处理方法仍未完全开发。 也许最有前途的应用，三维（3D）太赫兹成像与同时化学表征，仍然难以捉摸，由于太赫兹成像配置的独特几何形状和随后的太赫兹波散射所带来的挑战。 这项研究的核心贡献将是开发先进的基于物理的信号处理技术，用于三维成像和同步光谱材料表征。这些技术基于电磁散射理论的预测（例如，来自平面裂缝和弯曲层的反射），以优先联合收割机组合来自多个传感器、频率和偏振的反射测量。 这项工作将产生用于合成孔径成像系统的高级3D聚焦的方法，同时从THz反射光谱中检测光谱材料特征。虽然这项工作将在特定的太赫兹传感应用中取得进展，但理解和利用波与基于物理的处理的相互作用的需要具有广泛的适用性，并且所提出的综合理论，建模和测量工作将显着推进该领域的知识。 更广泛的影响这项研究将支持在波特兰州立大学与国际学术和行业合作伙伴的研究和教育的综合活动。 潜在的社会效益确实令人印象深刻，可能使快速和强大的3D化学映射的能力，为未来的行业应用在无损评估，医学成像和安全筛选。这项研究将专门针对两个成像应用：1）快速评估的形状和材料组成的涂层药物片剂;和2）检测裂纹的太阳能电池板，以提高生产？绿色？能源 除了这些工作的更广泛的影响，本科生和研究生将有机会从事尖端的太赫兹研究，并参与国际合作。PI将继续开展K-12外联活动，并指导科学和工程领域的妇女。