公开(公告)号：US08301396B1

公开(公告)日：2012-10-30

申请号：US11975772

申请日：2007-10-22

Applicant: Suresh Dhanijala ,  Manish Ranjan

Inventor： Suresh Dhanijala ,  Manish Ranjan

IPC: G01N31/00

CPC classification number: G01N15/0266 ,  B03C3/017 ,  B03C3/08 ,  B03C3/12 ,  B03C3/41 ,  B03C3/47

Abstract: Theory and design of a new electrical-mobility based instrument for measurement of aerosol particle size distributions in real time is presented. Miniature Electrical Aerosol Spectrometer has a rectangular cross-section with two main regions: the Electrostatic Precipitator (ESP) and Classifier sections. The ESP section enables charged particle injection into the classifier section in a narrow range of streamlines at the desired location. The injected charged particles are then segregated based on their electrical mobility in the classifier section and collected on a series of plates that are connected to electrometers. Real-time particle size distribution measurements can be inferred from the electrometer signal strengths with the knowledge of the instrument transfer function. A theoretical approach is developed to calculate Miniature Electrical Aerosol Spectrometer transfer function considering the non-uniformity in the electric and flow fields inside the instrument, and accounting for the instrument dimensions and its operating conditions. The theoretical predictions of size classification characteristics are seen to compare well with numerical results. The modeling results suggest that an optimal operational domain exists for Miniature Electrical Aerosol Spectrometer.

Abstract translation: 提出了一种实时测量气溶胶颗粒尺寸分布的新型电动移动性仪器的理论与设计。 微型电气气溶胶光谱仪具有矩形截面，具有两个主要区域：静电除尘器（ESP）和分类器部分。 ESP部分使得带电粒子在所需位置的窄流线范围内注入分类器部分。 然后注入的带电粒子基于其在分级器部分中的电迁移率而被分离并收集在连接到静电计器的一系列板上。 通过仪器传递函数的知识，可以从静电计信号强度推断实时粒度分布测量。 考虑到仪器内部电气和流场的不均匀性，并考虑仪器尺寸及其工作条件，开发了一种理论方法来计算微型电气雾度光谱仪传递函数。 大小分类特征的理论预测与数值结果相比较。 建模结果表明，微型电气气溶胶光谱仪存在最佳操作领域。