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Abstract：
Monitoring the processes inside crystalline materials under their operating conditions is of great interest in optoelectronics and scientific instrumentation. Early defect detection ensures the proper functioning of multiple crystal-based devices. In this study, a combination of acoustic emission (AE) sensing and cross-polarization imaging is proposed for the fast characterization of the crystal\'s structure. For the experiments, tellurium dioxide (TeO2) crystal was chosen due to its wide use in acousto-optics. Studies were performed under uniaxial compression loading with a simultaneous acquisition of AE signals and four polarized optical images. An analysis of the temporal dependencies of the AE data and two-dimensional maps of the light depolarization features was carried out in order to establish quantitative criteria for irreversible damage initiation and crack-like defect formation. The obtained results reveal the polarization image patterns and the AE pulse duration alteration specific to these processes, and they open up new possibilities for non-destructively monitoring in real-time the structure of optically transparent crystals under their operating conditions.
摘要：
在操作条件下监测晶体材料内部的过程对光电子学和科学仪器非常感兴趣。早期缺陷检测确保了多个基于晶体的器件的正常运行。在这项研究中,提出了声发射（AE）传感和交叉偏振成像的组合，用于快速表征晶体的结构。对于实验，选择二氧化碲（TeO2）晶体是因为其在声光中的广泛使用。在单轴压缩载荷下进行研究，同时采集AE信号和四个偏振光学图像。对AE数据的时间依赖性和光去偏振特征的二维图进行了分析，以建立不可逆损伤引发和裂纹状缺陷形成的定量标准。获得的结果揭示了这些过程特有的偏振图像模式和AE脉冲持续时间变化，它们为在工作条件下实时无损监测光学透明晶体的结构开辟了新的可能性。
