SBIR Phase I: Interferometric Laser Technique for Sizing and Velocimetry of Irregular and/or Inhomogeneous Particles

[561625] Naqwi这个小企业创新研究（SBIR）第一阶段项目的目的是研究将干涉相位多普勒技术扩展到不规则粒子的可行性。由不规则粒子产生的相移信号将被解释为随机过程的结果，即给定的粒子（取决于其在测量体积中的方向）预计会以一定的概率产生特定的相移。本项目旨在通过实验研究与不同类型的不规则和非均匀粒子相关的相移概率函数的性质（初步测量表明这些函数的形式可能相当简单）。为此，不规则颗粒将使用测量颗粒体积、横截面积或空气动力学直径的替代技术进行鉴定。统计随机粒子的几何散射理论也将被发展来预测上述概率函数。最后，将开发数值反演方案，从测量的相移分布推断速度分辨粒度分布。第二阶段的成功完成，如果获得批准，将带来一种非常理想的技术，用于多相流中不规则颗粒的非侵入性和空间分辨测量。测量将通过单个光学窗口进行，与激光强度无关。目前，没有同等的商业或非商业工具可用。

9561625 Naqwi The purpose of this Small Businness Innovation Research (SBIR) Phase I project is to examine the feasibility of extending the interferometric phase Doppler technique to irregular particles. Phase shift signals generated by the irregular particles will be interpreted as the outcome of a stochastic process, i.e. a given particle (depending upon its orientation in the measurement volume) is expected to generate a particular phase shift with a certain probability. This project aims at experimentally examining the nature of the phase shift probability functions, associated with different kind of irregular and inhomogeneous particles (preliminary measurements indicate that these functions may be fairly simple in form). For this purpose, irregular particles will be qualified using alternative techniques that measure particle volume, cross-sectional area or aerodynamic diameter. The theory of geometrical scattering by statistically random particles will also be developed to predict the above probability functions. Finally, numerical inversion schemes will be developed to deduce velocity-resolved particle size distributions from the measured phase shift distributions. The successful completion of Phase II, if approved, will lead to a very desirable technique for non-intrusive and spatially-resolved measurement of irregular particles in multiphase flows. Measurements would be conducted through a single optical window and would be independent of laser intensity. Currently, there is no equivalent commercial or non-commercial instrument available.