In this work, the borescopic particle image velocimetry (BPIV) technique was applied to a bubbling gas–solid fluidized bed, and the results were compared with published positron emission particle tracking (PEPT) measurement data. Before performing the experiments, the sensitivity of the BPIV results to the illumination power, light reflectivity of the particles, and location of the borescope was also investigated. The BPIV and PEPT results were in fair agreement; however, some discrepancies were observed. The difference between the two sets of results were mainly caused by the intrusiveness of BPIV, the fact that the local solids volume fraction was not accounted for in the BPIV analysis, and the intrinsic differences of these two methods. Therefore, measurement of the local solids volume fraction with the borescope is highly recommended for further development of the BPIV method, which will also enable measurement of the local solids mass fluxes inside dense gas–solid fluidized beds.

在这项工作中，将内窥镜粒子图像测速技术（BPIV）应用于鼓泡的气固流化床，并将结果与​​已发布的正电子发射粒子跟踪（PEPT）测量数据进行了比较。在进行实验之前，还研究了BPIV结果对照明功率，粒子的光反射率和管道镜位置的敏感性。BPIV和PEPT结果基本一致；但是，观察到一些差异。两组结果之间的差异主要是由于BPIV的侵入性，在BPIV分析中未考虑局部固体体积分数这一事实以及这两种方法的内在差异引起的。所以，