Droplets, bubbles, or solid particle concentrations and their particle size distributions markedly influence the process conditions. In this article, an overview with respect to popular invasive and non‐invasive local measurement techniques for bubbles and droplets will be given. It starts with capillary suction probes, laser Doppler anemometry and finally covers actual developments in tomography and optical endoscopic measurement techniques. Furthermore, the possibilities and limitations of analyzing particle size distributions with these different methods in various application fields will be discussed.

中文翻译：

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流体过程工程中的颗粒测量技术

液滴，气泡或固体颗粒浓度及其粒径分布会显着影响工艺条件。在本文中，将概述有关气泡和液滴的流行的有创和无创局部测量技术。它从毛细管吸力探头，激光多普勒风速仪开始，最后涵盖了层析成像和光学内窥镜测量技术的实际发展。此外，还将讨论在各种应用领域中使用这些不同方法分析粒度分布的可能性和局限性。