In-Process Particle Sizing by Refractive Index Measurement

通过折射率测量进行过程中粒度测量

• 批准号: EP/F007019/1
• 负责人: Mingzhong Li
• 金额: $ 24.98万
• 依托单位: De Montfort University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF007019%2F1
• 关键词: Process; Particle; Sizing; Refractive; Index

A radical new technique is proposed for in-line process particle measurement at sizes from 0.1micron to 10micron and concentrations up to 50% by volume without interfering in the process. The method involves calculation of optical refractive index of the suspension from critical angle measurements at several wavelengths. This technique requires no light passage through the suspension so its turbidity does not restrict the method. In practice, the critical angle is not clearly marked for turbid suspensions but there is a substantial variation of reflectance in the vicinity of the critical angle.Measuring the suspension refractive index has significant advantages over other widely used non-invasive methods of particle analysis such as spectral extinction and laser diffraction: - The relationship between refractive index and volume fraction is linear for volumetric concentrations up to 50%.- Mie scattering theory can be used to calculate the refractive index of concentrated suspensions of spheres. - Suspension refractive index is sensitive to particle size and size distribution.

提出了一种全新的在线测量工艺颗粒的技术，其尺寸从0.1微米到10微米，浓度高达50%（体积），而不会干扰工艺过程。该方法涉及从在几个波长下的临界角测量计算悬浮液的光学折射率。该技术不需要光通过悬浮液，因此其浊度不会限制该方法。在实践中，混浊悬浮液的临界角并没有明确的标记，但在临界角附近，反射率有很大的变化。测量悬浮液折射率比其他广泛使用的非侵入性颗粒分析方法（如光谱消光和激光衍射）具有显著的优势：- 对于高达50%的体积浓度，折射率和体积分数之间的关系呈线性。-米氏散射理论可用于计算球形浓悬浮液的折射率。- 悬浮液折射率对颗粒大小和粒度分布敏感。

项目成果

A novel method for determination of particle size distribution in-process

一种测定过程中粒度分布的新方法

• DOI: 10.1117/12.835099
• 发表时间: 2009
• 作者: Salaoru T

Determination of particle size distribution by refractive index measurement

通过折射率测量测定粒度分布

• 发表时间: 2010
• 作者: Adrian Tiberiu Salaoru

In-situ characterisation of crystallization using an ultrasound spectroscopy probe

使用超声波光谱探头对结晶进行原位表征

• 发表时间: 2010
• 作者: Ken Primrose