Zhou Jun, Xie Li
Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Ministry of Education, Lanzhou, Gansu 730000, China.
Appl Opt. 2011 Jan 20;50(3):379-86. doi: 10.1364/AO.50.000379.
By taking net surface charge into consideration, the scattering field of particles illuminated by dual laser beams of phase Doppler anemometry (PDA) is computed based on Mie's theory, and the effect of net surface charge on the phase-diameter relationship and the phase ratio is studied. It is found that the phase-diameter relationship and the relationship between the phase ratio and the refractive index of charged particles could be significantly different from those of uncharged particles, which would lead to errors in particle sizing and the measurement of refractive indices. A method of recognizing charged particles and determining the value of their surface conductivity, which is related to net surface charge, is proposed by utilizing the effect of net surface charge on the measurement of refractive indices using PDA.
考虑到净表面电荷，基于米氏理论计算了相位多普勒测速仪（PDA）双激光束照射下粒子的散射场，并研究了净表面电荷对相直径关系和相位比的影响。研究发现，带电粒子的相直径关系以及相位比与折射率之间的关系可能与不带电粒子的显著不同，这会导致粒子尺寸测量和折射率测量出现误差。利用净表面电荷对PDA折射率测量的影响，提出了一种识别带电粒子并确定其与净表面电荷相关的表面电导率值的方法。
