用于滑坡监测的自动跟踪激光表面测速系统

为实现滑坡表面速度、位移的自动实时监测,研制了一套新颖的自动跟踪激光表面测速系统(TLSV)。该测速系统基于激光多普勒效应,采用反馈控制技术,能够实现目标沿光轴方向速度、位移的精密测量,以及目标的自动跟踪。系统采用的"信号搬移消除噪声法",可以将常规去噪技术难以去除的混杂在多普勒信号中的噪声和干扰有效消除,进一步提高多普勒信号的信噪比;同时,"假随机采样一致性算法"使测速系统能够快速、准确识别目标,保证了目标跟踪的成功执行。并且,反光膜的合理应用使远距离目标的测量成为了可能。实验结果表明,该测速系统可实现目标沿光轴方向亚μm级速度、位移的准确测量,测量误差小于0.5%,测量距离大于50m。系统利用自动跟踪功能也同时实现了目标面内运动的监测,一定程度上将目标监测从二维平面扩展到三维立体空间。

Tracking laser surface velocimeter used for landslide monitoring

A novel tracking laser surface velocimeter(TLSV) is proposed to improve both the measurement accuracy and the temporal resolution in monitoring landslide surface displacements.The TLSV based on the laser Doppler Effect utilizes the feedback control technology,which can implement the precise measurement of velocity and displacement along the optical axis of objects,and track objects automatically.In order to further increase the signal-to-noise ratio of the Doppler signal,the signal shift denoising method is...