Development of Real-time Deformation and Strain Measurement System by Integrated Phase-shifting Grid Method Using Correlation

在本研究中，我们提出了一种新的高速和高精度的形状，变形和应变测量方法，使用DMD（数字微镜设备）。特别提出了基于相关的积分相移网格法。我们还提出了其他的相位分析方法。我们为这些方法开发了一些系统。它们被应用于网格投影法、光弹性法和激光干涉法。主要结论如下：1. DMD的性能通过计算机模拟得到了证实。实验结果验证了本文提出的算法的有效性.设计了一种DMD反射式CCD相机。通过准静态实验验证了相移扫描云纹法在DMD相机上获得的轮廓图像和等位移图像的性能.获得了驱动DMD芯片的控制信号信息。设计了DMD芯片的实时驱动电路.提出了一种光弹性实时应力分析的相移法。搭建了实验装置，验证了该方法的有效性.提出了一种双向集成相移方法。并将其应用于云纹干涉法中两个位移分量的同时分析.提出了一种将集成相移法应用于连续体物体形状和变形测量的算法.提出了一种利用调频光栅进行相位解缠的方法。

In this study, we proposed a novel high-speed and high-accuracy shape, deformation and strain measurement method using a DMD (Digital Micro-mirror Device). We especially proposed the integrated phase-shifting grid method using correlation. We also proposed other phase analysis methods. We developed some systems for these methods. They were applied to a grid projection method, photoelasticity and a laser interferometric method. The conclusions are as follows :.1. Performance of the DMD was confirmed by a computer simulation. As the result, our proposed algorithm is confirmed.2. A DMD reflection-type CCD camera (DMD camera) was structed. The performance was confirmed with a quasi-static experiment that a contour image and an equal-displacement image was obtained by the DMD camera using the phase-shifting scanning moire method.3. Information of the control signals to drive the DMD chip was acquired. A circuit to drive the DMD chip in real-time was designed.4. A novel phase-shifting method for stress analysis in real-time by the photoelasticity was proposed. The experimental setup was built and the validity is confirmed.5. Two-directional integrated phase-shifting method was proposed. It was applied for a simultaneous analysis of two displacement components in moire interferometry.6. An algorithm to apply the integrated phase-shifting method to shape and deformation measurement of continuum objects was developed.7. A phase-unwrapping method using a frequency modulated grating was developed.