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。

The reconstruction quality of in-line holography suffers from the superposition of twin images that have different foci but identical information content. We propose a phase retrieval method using two axially displaced holograms and a finite transmission constraint to eliminate the conjugate image. The simulation and experimental results demonstrate a better elimination effect and a faster rate of convergence compared with those of previously reported methods. Two holograms can be recorded simultaneously using two cameras, thus this technique can be used in real-time imaging.

针对球形光学元件的表面质量检测, 开发了一种基于数字全息的表面曲率参数及疵病的同步检测方法。利用最小二乘法对再现波前进行参数拟合和计算, 解决了再现过程中倾斜因子补偿对测量可靠性造成的影响。通过将原始数据与生成的虚拟曲面相减实现了表面疵病信息的同步提取。实验证明, 该方法的测量结果与白光干涉仪的测量差异小于1.5%, 在不同倾斜因子补偿系数作用下的测量结果误差小于1%。

An improved polarization recording approach to reduce speckle noise in digital holography is proposed. Multiple off-axis holograms are obtained by rotating the linear polarization state of both illumination and reference wave simultaneously. By averaging the intensity fields, the speckle noise in the reconstructed images is well suppressed. Statistical evaluation of the experimental results shows the effectiveness and improvement of the proposed method.