Study of an incremental optical encoder using speckle

PEREZ QUINTIAN, FERNANDO; LUTENBERG, ARIEL; REBOLLO, MARÍA A.

Nimes, Francia

Congreso; Speckle06; 2006

We present a study of the performance of an incremental optical encoder that works using speckle pattern illumination and a phase grating. The operational principle of the encoder lies in measuring the variations of a speckle pattern passing through the phase grating that can be displaced. This study is described theoretically by a 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. Likewise, the mounting tolerances of the proposed system are analyzed