SBIR Phase I: High Contrast Real Time Terahertz Imaging System
SBIR 第一阶段:高对比度实时太赫兹成像系统
基本信息
- 批准号:1315916
- 负责人:
- 金额:$ 14.89万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-07-01 至 2013-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This Small Business Innovation Research (SBIR) Phase I project is focused on the demonstration of a real-time high-contrast Terahertz (THz) imaging system, based on frequency upconversion of THz images into the near infrared (NIR) spectral range. Due to low power of compact THz sources and poor sensitivity of room-temperature THz detection techniques, imaging systems operating in 0.3-3 THz range of frequencies remain far less advanced than optical or microwave instruments. Upconversion of THz radiation to NIR enables the use of imaging systems based on faster, more sensitive NIR detectors and detector arrays. This technique has been demonstrated in the past, using broadband THz combined with femtosecond NIR pulses, but the contrast of these real-time THz images was limited. The objective of this project is to demonstrate high contrast, real-time THz images using upconversion of high power narrowband THz and picosecond NIR pulses in quasi-phase matched crystals. This approach will provide upconverted THz-NIR images that can be spectrally filtered from the background NIR light, significantly improving the contrast. The high contrast between signal and background should allow for real time THz imaging using readily available NIR cameras and recently developed high power narrowband THz sources.The broader impact/commercial potential of this project ranges from terahertz (THz) imaging systems for cancer screening to airport security systems. Millimeter wave imaging systems, operating at 20-30 GHz frequencies, are being deployed in airports now. THz cancer screening instruments have been in trials for a few years and have shown great promise in the early detection of certain types of cancers. There are a variety of industrial and security applications for non-destructive evaluation using THz waves, which are not heavily absorbed or scattered by fabrics, plastics and many composite materials. These and many other potential applications of THz have been tested by researchers around the world for decades, but very few THz instruments reached the broader scientific community and none are widely used in the industry today. Limited sensitivity, long processing time of THz imaging systems, and limited spectral bands not absorbed by water are the main barriers for wider applications of these instruments. The proposed project targets all of these barriers, focusing on a water transmission window at 1.5 THz and potentially enabling much more practical THz instruments for a broader research and industrial community.
该小型企业创新研究(SBIR)第一阶段项目的重点是演示实时高对比度太赫兹(THz)成像系统,该系统基于THz图像到近红外(NIR)光谱范围的频率上转换。由于紧凑型THz源的低功率和室温THz检测技术的低灵敏度,在0.3-3 THz频率范围内工作的成像系统仍然远不如光学或微波仪器先进。THz辐射到NIR的上转换使得能够使用基于更快、更灵敏的NIR检测器和检测器阵列的成像系统。这种技术在过去已经被证明,使用宽带太赫兹结合飞秒近红外脉冲,但这些实时太赫兹图像的对比度是有限的。该项目的目的是展示高对比度,实时太赫兹图像使用高功率窄带太赫兹和皮秒近红外脉冲在准相位匹配晶体的上转换。这种方法将提供上转换的THz-NIR图像,可以从背景NIR光中进行光谱过滤,从而显著提高对比度。信号和背景之间的高对比度应该允许使用现成的NIR相机和最近开发的高功率窄带THz sources.The更广泛的影响/商业潜力的太赫兹(THz)成像系统的癌症筛查机场安全系统的真实的时间THz imaging。毫米波成像系统,工作在20-30 GHz的频率,现在正在部署在机场。THz癌症筛查仪器已经进行了几年的试验,并在某些类型癌症的早期检测中显示出巨大的前景。使用太赫兹波进行无损评估有各种工业和安全应用,这些应用不会被织物,塑料和许多复合材料严重吸收或散射。几十年来,世界各地的研究人员已经对THz的这些和许多其他潜在应用进行了测试,但很少有THz仪器能够进入更广泛的科学界,而且目前没有一种仪器在工业中得到广泛应用。太赫兹成像系统的灵敏度有限、处理时间长以及不被水吸收的光谱带有限是这些仪器更广泛应用的主要障碍。拟议的项目针对所有这些障碍,重点是1.5 THz的水传输窗口,并可能为更广泛的研究和工业界提供更实用的THz仪器。
项目成果
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