双孔载频剪切散斑干涉法测量表面动态形变

朱猛; 李翔宇; 黄战华; 李宏跃

doi:10.3788/OPE.20132107.1701

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双孔载频剪切散斑干涉法测量表面动态形变

现代应用光学 | 更新时间：2020-08-12

- 双孔载频剪切散斑干涉法测量表面动态形变
- Dynamic Deformation Measurement Using Speckle Shearography with Carrier Frequency Generated by Double-aperture
- 光学精密工程 2013年21卷第7期页码：1701-1706
- 作者机构：
  
  天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室天津,300072
- 作者简介：
- 基金信息：
  
  国家自然科学基金(41301448);国家科技支撑计划(2015BAF10B01)
- DOI：10.3788/OPE.20132107.1701
  中图分类号： O436.1;TH744.3
- 收稿日期：2013-02-04，
  
  修回日期：2013-03-14，
  
  网络出版日期：2013-07-15，
  
  纸质出版日期：2013-07-15
- 稿件说明：
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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

. Dynamic Deformation Measurement Using Speckle Shearography with Carrier Frequency Generated by Double-aperture[J]. Editorial Office of Optics and Precision Engineering, 2013,21(7): 1701-1706
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 DOI： 10.3788/OPE.20132107.1701.

. Dynamic Deformation Measurement Using Speckle Shearography with Carrier Frequency Generated by Double-aperture[J]. Editorial Office of Optics and Precision Engineering, 2013,21(7): 1701-1706 DOI： 10.3788/OPE.20132107.1701.

摘要

为了精确地测量物体表面的动态形变并得到形变高度和梯度信息，提出了一种基于双孔衍射结构的空间载频剪切散斑干涉法。该方法采用双孔产生固定的载频条纹，利用双旋转光楔实现剪切量的连续调节，采用正弦拟合算法进行相位计算。首先，分析了双孔调制的相位载频与双孔距和像距之间的关系，讨论了双旋转光楔得到线性剪切量调整的实验参数。然后，设计了测量光路参数；采用孔距为3.8 mm的双孔径配合焦距为80 mm的成像镜头在物距为300 mm时得到了载频为/2的散斑场。最后，对动态形变的薄金属板进行了测量。实验结果表明：配合实时图像处理系统，该方法可以在帧率为15 frame/s的采集速度下实现动态形变的测量与显示，可测形变峰值为0.11~1.15 m。本系统结构简单，易于集成，适用于动态形变的实时检测。

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 /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 1.15 m. This approach yields simple and compact optical implementation and allows a real time detection for dynamic deformation.

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references

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