Biomedical subjects

Fernando Perez-Quintián

Publications and source records attributed to Fernando Perez-Quintián.

2 recordsLinked to original sources

PubMed2006

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.

Journal Article↗

PubMed2004

Surface characterization from doubly scattered light.

When a translucent diffuser is illuminated by a speckle pattern, a new speckle pattern is produced. We show that the decorrelation of this intensity pattern by displacement of the diffusing surface is related to the standard deviation of the slope's distribution when the illuminating speckle grain is chosen appropriately small. The experimental results are compared with those obtained by measuring the angular distribution of the mean scattered intensity, and they show good agreement with each other.

Journal Article↗