偏振正交双频DBR腐蚀声发射传感器研究

发布时间：2018-07-17 21:15

【摘要】：为了实现基于光纤传感器的金属腐蚀在线监测,以金属Q235腐蚀声发射在线监测为目标,采用分布式布喇格反射(DBR)光纤激光器作为腐蚀声发射传感器的方法,通过对偏振正交DBR光纤激光器的工作机理及模型进行研究,分析了偏振正交双频DBR激光器用于腐蚀声发射传感器的谐振腔参量对其性能影响的规律,并进行了基于偏振正交双频DBR激光器的声发射检测实验,实现了偏振正交DBR光纤激光器的优化设计,提出了表征Q235碳钢腐蚀阶段的特征量。结果表明,偏振正交DBR光纤激光器不仅能实现对金属腐蚀声信号的检测,其检测频带范围为0MHz~1MHz,还能实现通过平均拍频值的变化来表征金属腐蚀主要的3个腐蚀阶段。该研究为偏振正交DBR腐蚀声发射传感器及组网的优化设计与制作提供了理论和技术基础,对金属腐蚀特别是核级关键材料的在线腐蚀监测具有重要意义。
[Abstract]:In order to realize the on-line monitoring of metal corrosion based on optical fiber sensor, the distributed Bragg reflection (DBR) fiber laser is used as the method of corrosion acoustic emission sensor, aiming at the on-line monitoring of metal Q235 corrosion acoustic emission. By studying the working mechanism and model of polarized orthogonal DBR fiber laser, the influence of resonator parameters of polarization orthogonal dual frequency DBR laser on the performance of acoustic emission sensor is analyzed. The acoustic emission detection experiment based on polarization orthogonal dual-frequency DBR laser is carried out. The optimized design of polarization orthogonal DBR fiber laser is realized. The characteristic quantity of Q235 carbon steel corrosion stage is proposed. The results show that the polarization orthogonal DBR fiber laser can not only detect the corrosion sound signal of metal, but also can detect the metal corrosion in the frequency band range of 0 MHz ~ 1 MHz, and can also characterize the three main corrosion stages of metal corrosion by the change of the average beat frequency. This study provides a theoretical and technical basis for the optimal design and fabrication of polarization orthogonal DBR corrosion acoustic emission sensors and netting, and is of great significance for the on-line corrosion monitoring of metal corrosion, especially for nuclear grade critical materials.
【作者单位】：天津大学精密测试技术及仪器国家重点实验室;
【基金】：国家自然科学基金资助项目(61304244)
【分类号】：TP212

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