摘要
金属材料在科学仪器和现代工业设备中有着广泛使用,而在加工、制作以及长期使用的过程中,其内部可能会因腐蚀等因素而出现孔洞等微小缺陷,这些缺陷会导致产品质量下降,并增加潜在的安全隐患,因此微小缺陷的精准检测尤为关键。提出了一种基于多通道光纤干涉传感的激光超声微小缺陷高分辨检测方法。利用多通道光纤斐索干涉仪在较小的尺度内同时获得多点信息,通过对同一时刻的多点信号的传播特性和频率特性进行处理和分析,不需要扫描即可对样品内部的弹性波速进行快速检测,并实现了金属内部半径为2 mm的圆孔缺陷的高精度定位及圆孔边界形貌的描绘,检测结果与其实际轮廓、尺寸和位置高度吻合,验证了该检测方式的可行性。这种多通道光纤干涉激光超声检测方法可用于微小缺陷的高灵敏度、高分辨率无损检测,为金属内部微小缺陷的无损检测提供了具有很高实用价值的新方法。
Objective Metallic materials are extensively used in scientific instruments and modern industrial equipment. Various challenges are encountered throughout the processes of fabrication, manufacturing, and long-term utilization of metallic materials, among which the generation and accumulation of small defects significantly affect their applications. These small defects, which cause structural performance degradation due to corrosion, fatigue, and stress concentration, can progress gradually and ultimately result in quality issues or safety hazards in the equipment. Hence, precise and efficient detection of such small defects is imperative. Although several common detection methods have been investigated, such as piezoelectric detection, they still exhibit limitations in applications, such as non-contact or simultaneous detections of multiple points. Therefore, more advanced technologies are warranted to address these challenges. The method proposed in this study is based on multi-channel fiber interferometric sensing and laser ultrasonic inspection,which offers significant innovation and application prospects. This approach integrates multi-channel fiber interferometers and laser ultrasonic techniques, thereby overcoming the limitations of conventional methods and providing precise, high-resolution detection capabilities.Methods The Fizeau fiber interferometer utilizes the same single fiber as both the sample and reference arms. Therefore, by constructing a multi-channel Fizeau fiber interferometer, information can be acquired simultaneously from multiple points in an extremely small scale. This technology processes and analyzes the propagation characteristics and frequency properties of multipoint signals simultaneously, thus enabling the rapid detection of elastic waves along the sample surface without necessitating probe scanning. We conduct defect detection on aluminum alloy plates with circular hole defects experimentally and assess the result based on a comparison with aluminum plates without defects. By ana
作者
班瑞
张日丰
陶智勇
樊亚仙
Ban Rui;Zhang Rifeng;Tao Zhiyong;Fan Yaxian(College of Ocean Engineering,Guilin University of Electronic Technology,Beihai 536000,Guangxi,China;Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第14期144-152,共9页
Chinese Journal of Lasers
基金
广西自然科学基金(2021GXNSFAA220086,2021GXNSFDA075006)
国家自然科学基金(12064005)。
关键词
激光超声
多通道测量
回波定位
弹性表面波
laser ultrasound
multichannel measurement
echo localization
elastic surface waves
