光学精密工程2013，Vol.21Issue(7)：1701-1706,6.DOI:10.3788/OPE.20132107.1701
双孔载频剪切散斑干涉法测量表面动态形变
Measurement of dynamic deformation using speckle shearography with carrier frequency generated by double-aperture
摘要
Abstract
To measure the dynamic deformation and slope of an object surface,this paper proposed a shearing speckle interferometry with a spatial carrier frequency generated by double-apertures.In this method,a double-aperture mask was used to generate a spatial carrier,a rotating wedge pair was utilized to adjust the shear continuously and the sinusoidal-fitting algorithm was taken to calculate the phase distribution.This paper firstly derivated the relationship between the carrier phase and the separation of double apertures and also imaging distance.Then,the experimental condition to generate adjustable lateral shear was discussed based on the ratable wedge pair.Finally,the parameter of this measuring method was analyzed.To produce a π/2 carrier frequency,it suggested that the separation of double aperture was selected as 3.8 mm when the focus length of the imaging lens and object distance were 300 mm and 80 mm,respectively.A stress release plate after centre loading was measured,and the experimental results demonstrate that this measuring system can obtain the information of deformation in real time under the capturing rate of 15 frame/s and the measurable range of displacement peak value is from 0.11 to 1.15μm.This approach yields simple and compact optical implementation and allows a real time detection for dynamic deformation.关键词
散斑干涉/剪切干涉/空间载频/动态形变测量Key words
speckle interferometry/shearing interferometry/spatial carrier frequency/dynamic deformation measurement分类
数理科学引用本文复制引用
朱猛,李翔宇,黄战华,李宏跃..双孔载频剪切散斑干涉法测量表面动态形变[J].光学精密工程,2013,21(7):1701-1706,6.基金项目
国家自然科学基金资助项目(No.61275009) （No.61275009）
国家科技支撑计划资助项目(No.2007BA000013),高等学校博士学科点专项基金资助项目(No.20110032120059) （No.2007BA000013）
