Bi-Directional Displacement Measurement by Speckle Interferometry Immune to Random Vibration
Bi-Directional Displacement Measurement by Speckle Interferometry Immune to Random Vibration
复制标题
DOI：
10.1007/978-3-319-06986-9_8
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Arikawa;S. Yoneyama
中科院分区：
文献类型：
--
作者：
S. Arikawa;S. Yoneyama
研究了一种在随机振动环境干扰下采用最佳图像提取的散斑干涉法双向面内位移测量。在三脚架上搭建了一台小型散斑干涉仪，该干涉仪由4束激光组成，具有双向灵敏度。各敏感方向的激光偏振垂直排列，利用数码相机前的偏振分束器可将铝靶的漫反射激光分离。通过同时捕获每个敏感方向的散斑图像，使得双向面内位移测量成为可能。在存在随机振动的情况下，用该方法测量了目标的面内旋转。在初始状态和旋转状态下捕获了大量图像。然后提取出能产生干涉条纹的最佳图像。利用提取的图像，采用随机相移的方法进行了相位分析。结果表明，所分析的相位差图与给定的旋转角有很好的一致性。从而验证了环境干扰下散斑干涉法双向位移测量的可行性。
A bi-directional in-plane displacement measurement by speckle interferometry using an optimum image extraction under environmental disturbances as random vibrations is investigated. A compact speckle interferometer which has 4 laser beams for bi-directional sensitivity is constructed on a tripod. The polarizations of laser beams of each sensitive direction are arranged orthogonal and diffuse reflected laser beams from an aluminum target can be separated by a polarizing beam splitter in front of digital cameras. The bi-directional in-plane displacement measurement is made possible by a simultaneous capturing of the speckle images for each sensitive direction. An in-plane rotation of the target is measured by the proposed method in a presence of the random vibration. A lot of images are captured at the initial and the rotated state. Then, optimum images which can make interference fringes are extracted. A phase analysis by random phase-stepping method using extracted images is performed. As a result, the analyzed phase difference maps show a good agreement with the given rotation angle. Therefore, it is validated that the bi-directional displacement measurement by speckle interferometry under environmental disturbance is possible.