基于数字全息干涉的实时微振动检测

基于数字全息理论的方法，构建了一套微振动实时测量的实验系统。通过运用基于全息干涉图像的振动快速解算算法，直接从记录的全息图中提取振动信息，实现对振动物体振幅值进行实时测量。该系统的接收光为散射光，使得测量角度不受被测物体结构的影响。通过测量由标准正弦波驱动的被测物微振动情况，对该实验系统进行了实验验证，实验结果表明，该系统能够实时测量微振动的振幅值（算法处理时间约为0.11 ms），在550～2700 Hz频段内被测物的振幅较为稳定，系统稳定性误差为1.66%，真实地反映了其振动情况。

Real-time micro-vibration testing based on digital holographic interferometry

An experimental system based on digital holographic interferometry is proposed for real-time high-precision micro-vibration measurement. Vibration information can be extracted directly and instantaneously from the hologram by using fast micro-vibration testing algorithm. As the received light of the proposed system is the scattered light, the proposed system approach no assumptions on object surface feature and receiving angles. The feasibility of the proposed system is demonstrated by using a vibrating object driven by standard sinusoidal signals. The result demonstrates that the measured amplitude can be output in real time (the processed time is about 0.11 ms). It also reveals that the measured amplitude from 550 to 2700 Hz is steady, with an output difference of 1.66%. The proposed system provides an effective way to quantitatively analyze the amplitude of micro-vibration.