SBIR PHASE II: Refinement of a Limited-Scan Backscatter Technique for Detection of Hidden Corrosion

*** 9312581 Yacout这个小型企业创新研究二期项目旨在扩展和完善光子反向散射技术，用于检测隐藏在外部直接观察之外的腐蚀。该技术包括在靠近外表面的有限范围内扫描准直源光子束（及其相关的准直探测器），提供快速无损检测。第二阶段将关注演示操作和优化实验室原型设备的设计，以检查具有平面和圆柱形几何形状的薄（4毫米）和厚（4毫米）外层（覆盖）的系统。在第一阶段研究期间开发的模拟代码将被升级为包含多能量源发射，板状和一般圆柱形几何形状，分布式能量下的光子检测（允许对模拟结果进行光谱分析），以及允许模拟各种条件的扩展材料库。该规范将用于确定有希望的设计条件进行实验研究。实验室台式原型设备将在设计和样品变量的范围内进行设计、构建和测试。设计变量将针对薄盖和厚盖条件进行优化。该方法可直接应用于各种人造系统（包括飞机、船舶、管道、储罐和加工罐、建筑物和桥梁）中隐藏和难以接近的腐蚀的检测。这些结构由于腐蚀造成的损害每年要花费数百万美元，而且还危及安全。＊＊＊

*** 9312581 Yacout This Small Business Innovation Research Phase II project seeks to extend and refine a photon backscatter technique for detecting corrosion that is hidden from direct external observation. The technique involves scanning a collimated source photon beam (and its associated collimated detector) over limited ranges near an external surface, offering rapid nondestructive examination. Phase II will be concerned with demonstrating operation and optimizing design of laboratory prototype equipment to inspect systems that have both thin ( 4 mm) and thick ( 4 mm) external layers (covers) in both planar and cylindrical geometries. A simulation code developed during the Phase I study will be upgraded to incorporate polyenergetic source emission, both slab and general cylindrical geometries, photon detection over distributed energies (allowing spectral analysis of simulation results), and an expanded material library that will allow a variety of conditions to be simulated. The code will be used to identify promising design conditions for experimental investigation. Laboratory bench-top prototype equipment will be designed, constructed, and tested over a range of both design and sample variables. Design variables will be optimized for both thin- and thick-cover conditions. The methodology has direct application to detection of hidden and inaccessible corrosion in various man-made systems including aircraft, ships, pipes, storage and processing tanks, buildings and bridges. Damage to such structures due to corrosion costs many millions of dollars per year and compromises safety. ***