In-line imaging measurements of particle size,velocity and concentration in a particulate two-phase flow  

作　　者：Xiaozhen Chen Wu Zhou Xiaoshu Cai Mingxu Su Hailong Liu 

机构地区：[1]Institute of Particle and Two-phase Flow Measurement,University of Shanghai for Science and Technology

出　　处：《Particuology》2014年第2期106-113,共8页颗粒学报（英文版）

基　　金：support from the National Natural Science Foundation of China(51206112,51076106, 51176128);the Science and Technology Support Program in Shanghai(10540501000)

摘　　要：A novel method is developed for in-line measurements of particle size, velocity and concentration in a dilute, particulate two-phase flow based on trajectory image processing. The measurement system consists of a common industrial CCD camera, an inexpensive LED light and a telecentric lens. In this work, the image pre-processing steps include stitching, illumination correction, binarization, denoising, and the elimination of unreal and defocused particles. A top-hat transformation is found to be very effective for the binarization of images with non-uniform background illumination. Particle trajectories measured within a certain exposure time are used to directly obtain particle size and velocity. The particle concentration is calculated by using the statistics of recognized particles within the field of view. We validate our method by analyzing experiments in a gas-droplet cyclone separator. This in-line image processing method can significantly reduce the measurement cost and avoid the data inversion process involved in the light scattering method.A novel method is developed for in-line measurements of particle size, velocity and concentration in a dilute, particulate two-phase flow based on trajectory image processing. The measurement system consists of a common industrial CCD camera, an inexpensive LED light and a telecentric lens. In this work, the image pre-processing steps include stitching, illumination correction, binarization, denoising, and the elimination of unreal and defocused particles. A top-hat transformation is found to be very effective for the binarization of images with non-uniform background illumination. Particle trajectories measured within a certain exposure time are used to directly obtain particle size and velocity. The particle concentration is calculated by using the statistics of recognized particles within the field of view. We validate our method by analyzing experiments in a gas-droplet cyclone separator. This in-line image processing method can significantly reduce the measurement cost and avoid the data inversion process involved in the light scattering method.

关 键 词：In-line measurements Particle trajectory Image processing Multi-parameters 

分 类 号：TQ021[化学工程]