激光多普勒测振仪
光学
斑点图案
频闪仪
振动
偏转(物理)
电子散斑干涉技术
激光扫描测振法
图像分辨率
干涉测量
空间频率
声学
数字图像相关
帧速率
多普勒效应
激光器
物理
激光束
天文
作者
Zhipeng Sheng,Bing Chen,Wenxin Hu,Keyu Yan,Hong Miao,Qingchuan Zhang,Qifeng Yu,Yu Fu
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2021-08-10
卷期号:29 (18): 28134-28134
被引量:17
摘要
Vibration measurement, particularly mode shape measurement, is an important aspect of structural dynamic analysis since it can validate finite element or analytical vibration models. Scanning laser Doppler vibrometry (LDV) and high-speed digital image correlation have become dominant methods for experimental mode shape measurement. However, these methods have high equipment costs and several disadvantages regarding spatial or temporal performance. This paper proposes a laser Doppler vibrometer induced stroboscopic digital image correction for non-contact mode shape and operational deflection shape measurement. Our results verify that single-point LDV and normal rate cameras can be used obtain high spatial resolution mode shape and operational deflection shape. Measurement frequency range is much higher than the camera capturing rate. We also show that the proposed approach coincides well with time-averaged electronic speckle pattern interferometry.
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