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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >MICROWAVE DETECTION OF STRESS-INDUCED FATIGUE CRACKS IN STEEL AND POTENTIAL OF CRACK OPENING DETERMINATION USING A NEW PHASE SENSITIVE APPROACH BASED ON A WAVEGUIDE MAGIC TEE
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MICROWAVE DETECTION OF STRESS-INDUCED FATIGUE CRACKS IN STEEL AND POTENTIAL OF CRACK OPENING DETERMINATION USING A NEW PHASE SENSITIVE APPROACH BASED ON A WAVEGUIDE MAGIC TEE

机译：基于波形魔术三通的新型相敏方法微波检测钢中应力诱发的疲劳裂纹和开裂电位的确定

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摘要

Changes in the phase of the reflection coefficient at the aperture of open-ended probes are the basis of microwave crack detection techniques. It is also known that the detector position along the standing wave of the sensor influences detection sensitivity. For these reasons, a phase sensitive approach with quick optimization capabilities utilizing a magic tee was devised. It was noted that short-circuit position (i.e. added phase offset) highly influenced detection sensitivity as expected. The effectiveness of the optimization was shown in Figure 5. For three bands (K, Ka, and V) detection sensitivity was optimized to detect and distinguish up to seven different crack openings on a fatigued steel bridge member. The results indicate detection for each band with this new approach. Next, features in the crack signals were scrutinized to determine if the crack opening could be determined. It was found that several features were promising for this purpose, including distance between inner peaks and other features and voltages levels at various locations. The results suggest that there are linear trends in the signals for the determination of crack opening merely from a scan of the fatigue crack.
机译：开放式探针孔径处反射系数相位的变化是微波裂纹检测技术的基础。还已知沿传感器驻波的检测器位置会影响检测灵敏度。由于这些原因，设计了一种具有灵敏三通的具有快速优化功能的相敏方法。注意到短路位置（即增加的相位偏移）如预期的那样严重影响了检测灵敏度。优化的效果如图5所示。针对三个频段（K，Ka和V），优化了检测灵敏度，以检测和区分疲劳钢桥构件上的多达七个不同的裂纹开口。结果表明使用该新方法检测了每个频带。接下来，仔细检查裂纹信号中的特征，以确定是否可以确定裂纹开口。已经发现，为此目的，有几个特征很有希望，包括内部峰与其他特征之间的距离以及各个位置的电压水平。结果表明，仅通过疲劳裂纹的扫描，用于确定裂纹开度的信号中存在线性趋势。

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