Real-time and on-line measurement of particle size distribution (PSD) in gas-solid fluidized bed is one of the important issues in multiphase flow processes .In this work

a mixture uniform design method was adopted for the experiment.Acoustic emission (AE) technique was applied to determine the particle size distribution.Wavelet packet analysis was introduced to characterize the energy spectrum feature in the AE signals.Furthermore

K-OPLS was proposed to construct the PSD prediction model based on AE signals

so that a quantitative non-linear relationship between the energy feature and PSD was established.The leave-one-out cross-validation error is 0.063

indicating that the model based on the K-OPLS method could be used to predict PSD with high precision and the AE method could be considered as an effective PSD measurement technique in industrial gas-solid fluidized beds.