摘要
提出了一种基于彩色摄像机的双波长激光剪切散斑干涉测量方法,用于同步测量变形物体的面内和面外位移导数。两束不同波长的激光以相同的入射角,同时对称地照射在被测物体表面。基于改进的迈克耳孙干涉光路并仅用一个相移器,建立了时间相移的双波长激光剪切散斑干涉测量系统。通过一个3芯片彩色相机的绿色和蓝色通道记录两个不同波长激光干涉形成的干涉图。运用Carré算法从分离的绿色和蓝色剪切散斑干涉条纹图中提取出与面内和面外变形导数分量相关的相位。悬臂铝梁的变形测量结果验证了该测试系统的可行性。
A color-camera-based shearography system using dual-wavelength lasers was developed for simultaneously measuring the in-plane and out-of-plane displacement derivatives of a deformed object.Lasers of dual wavelengths are arranged to symmetrically and simultaneously illuminate on the object with identical angles of incidence.A set of phase-shifter and a modified Michelson interferometer are used to build a temporal-phase-shift dual-wavelength shearography.The interferograms formed by the two wavelength are recorded by one 3-chip color camera with green and blue channels.The phases related to the in-plane and out-of-plane components are extracted from the shearograms by using Carréalgorithm.Experiment on a cantilevered aluminum beam deformation was performed to verify the feasibility and the capability of the testing system.
作者
吴敏杨
马银行
程昊
杨福俊
Wu Minyang;Ma Yinhang;Cheng Hao;Yang Fujun(Jiangsu Key Laboratory of Engineering Mechanics,Southeast University,Nanjing,Jiangsu 211189,China;Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2020年第18期128-133,共6页
Acta Optica Sinica
基金
国家自然科学基金(11772092,11472081)
江苏省研究生科研实践创新项目(KYCX19_0059)。
关键词
测量
双波长剪切散斑干涉
位移导数测量
3芯片彩色相机
measurement
dual-wavelength shearography
measurement of displacement derivative
3-chip color camera
