激光数字全息技术具有三维、非接触测量流场的能力，在颗粒场三维诊断领域具有巨大的应用潜力。对数字全息技术同时测量气固两相流场中固相大颗粒和气相示踪小颗粒进行了模拟和实验研究。模拟研究了大颗粒的存在对小颗粒检测成功率及精度的影响，以及全息对小颗粒的测量能力。在利用小波函数重建颗粒全息图和识别定位的基础上，获得流场中颗粒粒径及空间分布。利用所搭建的双光路激光数字全息系统对颗粒场进行实验测试，系统成功地对被测流场区域的颗粒场进行了重建，获得的颗粒粒径分布与实际情况基本吻合。结果表明:应用该系统测量多相流流场颗粒粒径、三维位置是可行性的。

For multiple-phase flow measurement, digital in-line holography has the advantages of three-dimensional （3D）and non-contact. It has been found to be a powerful tool in 3D diagnostics of particle field. A study on large and small particles in gas-solids flow field using a digital holographic system is presented. Firstly, the numerical simulation is conducted to study the precision influence of small particles measurement when large particle is existed in the flow field, and the capability of holography measurement on small particles. Secondly, the recorded particle hologram is numerically reconstructed by using wavelet transform algorithm. The size and spatial distribution of particles are obtained based on identification and 3D location of particles. In the experiments, by using digital in-line holographic measurement system, the particle fields are tested. It is found that the particles in the measurement volume are successfully reconstructed, and the measurement results of particle size distribution agree with the actual parameter. This indicates the feasibility that digital in-line holography is used to measure particle sizing and 3D position with different particle sizes and concentration distribution in multiple-phase flow.