Particle velocity measurement based on cross-correlation algorithm is used widely in various multiphase flow systems. In this study, an optical fiber probe, i.e. Labasys® 100 from MSE Meili was used to systematically compare the qualities of its measured particle velocities in a pair of hydrodynamically distinct regimes, i.e. a fast fluidized bed (FFB) and a bubbling fluidized bed (BFB). Compared to FFBs, the measured particle velocities in BFBs show lower data repeatability, higher percentage of invalid data and higher sensitivity to the selection of the threshold value of maximum cross-correlation coefficient, which corresponds to much lower measurement qualities in this regime. Comparatively, higher measurement qualities were observed in the FFB based on the same evaluating methods. The highest measurement qualities appear in the core region of the riser and under high superficial gas velocities. A matchup relationship between the measurement quality and the shape of the probability density function (PDF) curves of maximum cross-correlation coefficient is found. Narrower PDF curves correspond to higher measurement quality and vice versa.

基于互相关算法的粒子速度测量广泛应用于各种多相流系统。在这项研究中，光纤探针，即来自 MSE Meil​​i 的 Labasys® 100 被用于系统地比较其在一对流体动力学不同的状态下测量的粒子速度的质量，即快速流化床 (FFB) 和鼓泡流化床。 BFB）。与 FFB 相比，BFB 中测得的粒子速度显示出较低的数据可重复性、较高的无效数据百分比和对最大互相关系数阈值选择的更高敏感性，这对应于该制度中低得多的测量质量。相比之下，在基于相同评估方法的 FFB 中观察到更高的测量质量。最高的测量质量出现在立管的核心区域和高表观气速下。发现了测量质量与最大互相关系数的概率密度函数（PDF）曲线形状之间的匹配关系。更窄的 PDF 曲线对应于更高的测量质量，反之亦然。