We present a study of the variations of a speckle pattern passing through a grating that can
be displaced. This study is described theoretically by a simple model based on the scalar
diffraction theory in the Fresnel zone. The intensity correlation of the modified speckle as
a function of the grating displacement is obtained and compared with experimental results.
The possibilities of metrological applications in optical encoders are suggested.
© 2006 Optical Society of America
Equations on this page are rendered with MathJax. Learn more.