Development of real-time non-contact vibration measurement by optical methods and application to nondestructive testing

(1)非接触式全场无损检测技术的发展与应用：研究了激光剪切成像检测缺陷的有效性，并对其有效性进行了验证。基于微震测量的结构识别及其在健康评估中的应用：对于实际抗震改造前后的桥墩，采用激光多普勒测速仪(LDV)进行振型测试，并对整个振型进行有限元(FE)分析。通过实际的振动测量和振动分析，可以看到加固前后的自振频率的变化。

(1) Development and application of non-contact full-field non-destructive testing : We investigated the effectiveness of defect detection using a laser shearography, in addition, confirmed the effectiveness. of the vibration measurement using dynamic displacement measurement system with two ultra-high-speed camera.(2) Structure identification based on microtremor measurement and application for the health evaluation : As for the piers of the bridge before and after the actual seismic retrofit, vibration mode identification was carried out from the vibration test by laser doppler velocimeter(LDV) and finite element(FE) analysis of the entire mode of vibration. Using the actual vibration measurement and vibration analysis, we were able to see the change of natural frequency before and after reinforcement.