Linear displacement measurement with a grating and speckle pattern illumination.
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.
Perez-Quintián
Fernando
F
Laboratorio de Aplicaciones Opticas, Facultad de Ingeniería, Universidad de Buenos Aires, Buenos Aires, Argentina. fperez@fi.uba.ar
Lutenberg
Ariel
A
Rebollo
María A
MA