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为了实现目标极缓慢速度和微小位移的实时、准确监测,消除各种干扰对微弱多普勒信号的影响,设计了一套激光多普勒测速(LDV)系统。该系统采用迈克尔逊干涉光路和调幅解调、相敏检测技术,具有较强的抗干扰能力。实验结果表明,该系统可实现固体目标沿光轴方向μm/s级速度和μm级位移的实时、准确测量。该系统光路结构简单,对目标的表面状况无特殊要求,可用于滑坡、地陷等地质灾害的监测,及桥梁、大坝等工程结构变形状况的检测,该方案对相关科学实验和工件精密测量也有重要意义。
In order to realize real-time and accurate monitoring of target extremely slow speed and small displacement and eliminate the influence of various interferences on weak Doppler signals, a laser Doppler velocimetry (LDV) system was designed. The system uses Michelson interference light path and amplitude modulation demodulation, phase sensitive detection technology, has strong anti-interference ability. The experimental results show that the system can realize the real-time and accurate measurement of μm / s velocity and μm-level displacement along the optical axis of the solid target. The system has simple optical structure and no special requirements on the surface condition of the target. It can be used for the monitoring of geological disasters such as landslides and subsidence, as well as the deformation status of bridges, dams and other engineering structures. The program analyzes relevant scientific experiments and precision measurement of workpieces Also important.