The Study of Elastic and Inelastic Scattering Properties of Multicomponent Particle

• Main Authors: Yuan-Yi Chang, 張元義
• Other Authors: 林文印
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/8f34wy

博士 === 國立臺北科技大學 === 工程科技研究所 === 102 === In this study, it introduced a convenient experimental method and the comparison with Mie scattering model that could obtain the scattering function of single multicomponent particle as well as capture the elastic and inelastic scattering characteristics related to particle size, refractive index, and chemical composition. In the first part of this study, Mie scattering model were used to simulate and compare the optical property of ammonia sulfate, ammonia nitrate, and ammonia sulfate/ammonia nitrate particle. In the second part, the Particle Levitation System, multi-angle scattering intensity measurement system, and Ramen spectroscopy were used to measure and compare the optical property of Polymethyl methacrylate (PMMA) and carbon particle with different size. In the third part, the multicomponent particle was detected. Moreover, the multicomponent particle, particle levitation system, multi-angle scattering intensity measurement system, and Ramen spectroscopy were also used to measure and compare the elastic scattering and inelastic scattering properties as well as discuss the influences of refraction index and particle size of multicomponent particle. The experimental results indicated that the measurements of single particle scattering were in approximate trend with numerical simulations. The results also implicated that the simulation might result in significant error in the overall scattering because of using aerodynamic diameter to replace equivalent volume diameter. Besides, it might be presented some problems while the refractive index was usually estimated as the volume-weighted average method for particles of mixed chemical composition.