中国激光, 1984, 11 (4): 225, 网络出版: 2012-09-04
十字孔径散斑照相法
Investigation of laser speckle photography with cross-slit aperture
摘要
用理论和实验的方法研究了十字孔径的散斑特性。把十字孔径用于二次曝光的散斑照相法,以测量物体在平面内的位移(或变形)时,将能显著地提高干涉条纹的对比,降低相干噪声,而且还具有灵敏度高的特点。实验的结果与理论分析得到了很好的一致。
Abstract
Investigating the speckle pattern of a cross-slit theoretically and experimentally, we note in this paper that the object surface speckle pattern recorded on the recording plate has a 2-D gratingwise structure. After performing an optical Fourier transform on it, at the Fourier transform plane there appears a particular optical intensity distribution, a bright sharp cross-shape halo superimposed on a uniform square-shaped halo. Hence, the laser speckle photography with a cross-slit aperture will offer good quality interferogram with high contrast, low noise, and high sensitivity. Furthermore, the cross-shaped halo facilitates the measurement of fixing the original orientation of object motion as a reference coordinates. The experimental results are well consistent with the theoretical prediction.
陈明仪, 单启蛰. 十字孔径散斑照相法[J]. 中国激光, 1984, 11(4): 225. Chen Mingyi, Shan Qizhe. Investigation of laser speckle photography with cross-slit aperture[J]. Chinese Journal of Lasers, 1984, 11(4): 225.