二次彩虹法测量高折射率玻璃微珠折射率研究

基于米氏散射理论解释了激光照明下玻璃微珠的二次彩虹精细结构的成因,发现折射率的差异将直接影响二次彩虹精细结构的位置.对于实验中玻璃微珠半径变化引起二次彩虹精细结构间距变化的现象亦用米氏散射理论进行了模拟分析和实验研究.利用米氏散射的近似理论——艾里理论对玻璃微珠的折射率进行了测量.在对玻璃微珠二次彩虹精细结构所计算得到的折射率的统计分析基础上,通过校正测量误差后得到了玻璃微珠折射率的准确数据.

Study on Refractive Index Measurement of High Refractive Index Glass Beads by Secondary Rainbow Method

The fine structure of secondary rainbow of a glass bead illuminated by laser is explained by using Mie scattering theory.This kind of fine structure of glass bead is not the same with that of the water bead illuminated by laser.The whole movement of the fine rainbow structure of a glass bead with different refractive index is analyzed.The change of fringe spacing in the fine rainbow structure is simulated by computer program too,when the glass beads′ radius is different.Based on Airy theory,the refractive index of a glass bead illuminated by laser is computed.Using statistical analysis on different refractive index corresponding to different rainbow′s cyclic fringes in the fine structure,which is formed by radiating a glass bead with a beam of light,the refractive index is obtained exactly.