LASER SPECKLE MOVEMENT CAUSED BY SURFACE DEFORMATION AND LIGHT WAVELENGTHCHANGE
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摘要: 被激光照明的漫射面,由漫反射在空间Fresnel区形成的光场,用Fresnel-Kirchhoff积分表示。利用统计的方法,考虑变化前后强度场的相关度,得到关于强度场变化的三个基本方程,从而导出了激光散斑运动的一般公式。考虑了散斑场的变化是由漫射物面运动和变形以及激光光波长变化所引起。Abstract: When a surface is illuminated by laser, the field of diffusing reflectivelight can be described by Fresnel-Kirchhoff integration in the region of Fersnel. If the correlation, before and after the change of intensity field, is analysed by statistical method, three governing equations for variance of intensity field and speckle movement formula can be obtained. In these equations.the surface motion, deformation and wavelength change are all considered to cause the speckle movement.
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Key words:
- laser speckle /
- speckle interferometry /
- speckle metrology
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