光学学报, 2013, 33 (9): 0912003, 网络出版: 2013-07-16
菲涅耳双棱镜载频散斑干涉形变测量系统
Spatial Carrier Speckle Interferometry Technique Research Based on Fresnel Bi-Prism
测量 相干光学 散斑干涉 空间相移 载频 measurement coherence optics speckle interferometry spatial phase shift carrier frequency
摘要
剪切散斑干涉技术在表面形变测量中发挥着重要的作用,用于动态形变测量的空间相移技术使得散斑干涉技术更实用化。研究了一种基于菲涅耳双棱镜的空间载频产生方法,该方法与散斑剪切干涉结合可以实时地对变形梯度进行测量。应用菲涅耳双棱镜获得空间载频散斑干涉场并分析了双棱镜产生的剪切量和载频;采用单缝与菲涅耳双棱镜配合可以在一个散斑尺寸内产生空间载频;采用傅里叶分析方法进行了载频的标定,利用正弦拟合相移算法得到被测物的动态形变导数。实验结果证明采用菲涅耳双棱镜可以方便地实现散斑剪切干涉的空间相移测量,适合于动态形变检测。
Abstract
Speckle shearing interferometry is an important tool for dynamic surface deformation measurement, which in combination with spatial phase shift technique can make the method more useful in practice. More attention is paid to the spatial carrier frequency method based on Fresnel bi-prism which can measure the slope of deformation instantaneously. The application of Fresnel bi-prism can obtain a spatial carrier speckle interferogram. The shear distance and carrier frequency generated by the bi-prism are analyzed. A slit is used to control the speckle and produce the carrier in one speckle size. The calibration of carrier is implemented by Fourier analysis method, and the sinusoidal fitting method is used for actual measurement of slope. The experiments show that this method can be conveniently used in spatial phase shift speckle interferometry and is suitable for dynamic measurement.
朱猛, 黄战华, 李翔宇, 李秀明. 菲涅耳双棱镜载频散斑干涉形变测量系统[J]. 光学学报, 2013, 33(9): 0912003. Zhu Meng, Huang Zhanhua, Li Xiangyu, Li Xiuming. Spatial Carrier Speckle Interferometry Technique Research Based on Fresnel Bi-Prism[J]. Acta Optica Sinica, 2013, 33(9): 0912003.