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Real-time dual-channel speckle interferometry based on an improved dual-observation configuration with spatial phase-shifting
Measurement ( IF 5.6 ) Pub Date : 2021-02-20 , DOI: 10.1016/j.measurement.2021.109188
Guoqing Gu , Yun Pan , Chengchun Qiu , Chengjie Zhu

This paper develops a real-time dual-channel speckle interferometry system based on an improved dual-observation configuration to address the issue of simultaneous measurement of the out-of-plane displacement and slope. A dual-observation configuration combined with an additional light path is used to provide the possibility to create two measurement channels corresponding to the out-of-plane displacement and slope, respectively. In the system, two symmetric observation light paths are slightly displaced from each other by a deliberate tilt of the plane mirror to introduce an adjustable lateral shear. One of the two observation beams is shared by both measurement channels to improve the system’s stability. Besides, using the spatial carrier phase-shifting technique induced by multi-aperture, the real-time phase retrieval is achieved for simultaneous measurement of the dynamic out-of-plane displacement and slope. Both the experimental investigation and the non-destructive testing (NDT) application are finally presented to demonstrate the feasibility and effectiveness of the proposed system.



中文翻译:

基于具有空间相移的改进的双观测配置的实时双通道散斑干涉测量

本文开发了一种基于改进的双观测配置的实时双通道散斑干涉测量系统,以解决同时测量平面外位移和斜率的问题。双观测配置与附加的光路组合在一起,可用于创建分别对应于平面外位移和斜率的两个测量通道。在该系统中,两个对称的观察光路由于平面镜的故意倾斜而彼此略微移位,以引入可调节的横向剪切力。两个测量光束共享两个观察光束之一,以提高系统的稳定性。此外,利用多孔径引起的空间载波相移技术,实时相位检索可实现同时测量动态平面外位移和斜率。最后介绍了实验研究和无损检测(NDT)应用,以证明所提出系统的可行性和有效性。

更新日期:2021-02-24
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