Study on the acoustic emission frequency of salicylic acid crystal growth based on beam vibration

This study aims to investigate the relationship between the grain size of salicylic acid crystals and the frequency of acoustic emission signalsduring the crystallization of salicylic acid. During the crystallization process of salicylic acid, an acoustic emission system was utilized to monitor the emitted sound signals. Based on the beam vibration theory, a lateral vibration model of the crystals was constructed to study the correlation between acoustic emission signals and crystal grain size. This process occurs with one end of the crystal acting as a fixed end and the other as a free end. The study found that when the crystal grain size is between 100-300 µm, the characteristic frequency of the crystal is 115-344 kHz. Finite element analysis software was also employed to calculate the characteristic frequency of the crystal grain size, and the simulation results were highly consistent with the experimental data.