Developing Airborne Laser Doppler Vibrometry for Enhanced Dynamic Characterization for Large Engineering Structures

激光多普勒振动测量（LDV）是一种用于测量大型建筑结构的强大技术，但从地面测量会导致高度处测量点的入射角倾斜，并且无法检测到与测量传感器位置相关的背面。此外，大气中密度波动造成的干扰导致在较长距离测量时噪声增加。该项目是建立在基于振动的健康监测的基础上，通过LDV和自由移动的扫描镜连接到无人机上。我们的共同目标是探索方法，以便（A） 使得包括地面LDV和附接到无人机的机载光学单元的机载LDV系统能够远程测量结构动态响应，以及（B） 探索使用机载LDV对大型历史结构进行增强环境振动测试，以改进损坏评估。

Laser-Doppler vibrometry (LDV) is a powerful technique for measuring large building structures but measuring from the ground results in oblique angles of incidence for measurement points at height and in the inability to detect backs in relation to the measurement sensor position. In addition, disturbances due to density fluctuations in the atmosphere lead to increased noise when measuring over longer distances. This project is founded on vibration-based health monitoring by means of LDV and freely movables scanning mirrors attached to drones. Our joint goal is to explore means in order to (A) make possible an airborne LDV system comprising a ground LDV and an airborne optical unit attached to a drone for remote measuring structural dynamical response and(B) exploring enhanced ambient vibration testing using the airborne LDV for a large historical structure for improved damage assessment.