SBIR Phase I: A Coded Aperture Scheme for High Resolution X-Ray Tomography

该小企业创新研究计划（SBIR）第一阶段项目将评估利用低分辨率X射线断层扫描系统与编码孔径方案相结合以获得高分辨率深孔轮廓的可行性。在第一阶段的工作计划有三个任务：第一个是设计和集成一个低分辨率X射线层析成像系统的透射光栅，以获得高分辨率的X射线照片在多个视角。第二个是开发一种算法来解卷积这些高分辨率射线照片，以提供亚微米尺度的空间分辨局部密度信息。第三是使用汽车GDI注射器来评估系统。在第一阶段的工作中，将完全证明获得汽车喷油器等深孔的高分辨率轮廓的可行性。在第二阶段，将开发和评估可用于汽车和航空航天工业的原型系统。拟议项目的智力价值在于，它提供了一种合理和新颖的方法，利用先进的最先进的X射线仪器，结合强大的反卷积方法，在狭窄的深孔内获得精确的轮廓测量。该项目的更广泛影响/商业潜力是双重的。第一个涉及汽车喷油器中喷油器几何形状的估计。新的企业平均燃油经济性标准要求汽车发动机的效率比目前可能的要高得多。 所有的汽车制造商都在积极追求汽油直喷技术，精确控制喷雾形状和持续时间，以在广泛的操作条件下实现更高的效率。该行业内需要的关键仪器之一是诊断以准确地映射喷射器孔的轮廓。拟议的系统将是第一个仪器，可以提供这一未满足的需求，足够的方便和准确性的常规使用的注射器制造商。第二个应用是航空航天工业。在航空航天工业中，必须对喷嘴进行百分之百的测试。该行业面临的问题之一是需要精确地描绘喷嘴孔的几何形状，以确保能够满足喷嘴的相关性能标准。拟议项目的商业和社会效益是，它将使工业界能够测量喷油器和喷嘴内部的相关信息，从而提高效率并减少污染排放。

This Small Business Innovation Research Program (SBIR) Phase I project will evaluate the feasibility of utilizing a low-resolution X-Ray tomography system in tandem with a coded aperture scheme to obtain highly resolved profiles of deep holes. Three tasks are planned during the Phase I work: The first is to design and integrate a transmission grating with a low resolution X-Ray tomography system to obtain high-resolution X-ray radiographs at multiple view angles. The second is to develop an algorithm to deconvolute these high-resolution radiographs to provide spatially resolved local density information at sub-micron scales. The third is to evaluate the system using an automotive GDI injector. During the Phase I work, the feasibility of obtaining very high resolution profiles of deep holes such as those in automotive injectors will be completely demonstrated. During the Phase II, a prototype system that can be used by automotive and aerospace industry will be developed and evaluated. The intellectual merit of the proposed project is that it provides a sound and novel approach for utilizing advanced state-of-the-art X-ray instrumentation in conjunction with robust deconvolution methods for obtaining precise profile measurements inside narrow deep holes. The broader impact/commercial potential of this project is two-folds. The first involves the estimation of fuel injector geometry in automotive injectors. New Corporate Average Fuel Economy standards mandate much higher efficiency from automotive engines than are currently possible. All automotive manufacturers are actively pursuing Gasoline Direct Injection with precise control of the spray shape and duration to achieve higher efficiency over a broad spectrum of operating condition. One of the key instrumentation need within the industry is a diagnostic to accurately map the profile of the injector holes. The proposed system will be the first instrument that can provide this unmet need with sufficient ease and accuracy for routine use by injector manufacturers. The second application is in the aerospace industry. In the aerospace industry, hundred percent testing of nozzles is mandatory. One of the issues facing the industry is the need to accurately profile the geometry of the nozzle holes, so as to ensure that relevant performance criteria for the nozzle can be met. The commercial and societal benefit of the proposed project is that it will enable industry to measure relevant information inside fuel injectors and nozzles, enabling higher efficiency and reduced pollution emission.