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首页> 外文期刊>NDT & E international >Scanning laser source Lamb wave enhancements for defect characterisation
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Scanning laser source Lamb wave enhancements for defect characterisation

机译：扫描激光源兰姆波增强功能以​​表征缺陷

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摘要

Surface-breaking defects in thin storage structures can cause costly component failure if left undetected. Here, a method for detecting and characterising surface breaking defects using near-field Lamb wave enhancements is presented for measurements in which a laser generation source passes over the defect. A dual laser scanning system is used to generate and detect Lamb waves in aluminium plates containing v-shaped laser micro-machined slots of different depths. Time-frequency analysis techniques are used to identify and track the magnitudes of individual wave-modes across a scan at different frequencies, and large enhancements in signal magnitude at certain frequencies are observed for the fundamental A0 and S0 wave modes when the laser source passes over the defect lip. The mechanisms responsible for this enhancement are identified and examined, and a characterisation process for identifying the position and severity of the defect is presented.
机译：如果未检测到，薄存储结构中的表面破损缺陷会导致代价高昂的组件故障。在此，提出了一种利用近场兰姆波增强来检测和表征表面破裂缺陷的方法，用于激光产生源越过缺陷的测量。双激光扫描系统用于在包含不同深度的V形激光微加工槽的铝板上生成和检测兰姆波。时频分析技术用于识别和跟踪整个扫描过程中不同频率下各个波模的强度，当激光源经过时，对于基本的A0和S0波模，可以观察到某些频率下信号强度的大幅度提高。缺陷唇。确定并检查了负责这种增强的机制，并提出了用于识别缺陷的位置和严重性的表征过程。

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