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Slope detection method by modulated speckle patterns |
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| Authors: | Martha Molina Maria del Carmen Lasprilla Néstor Bolognini |
| Institution: | a Grupo de Óptica y Tratamiento de Señales (GOTS), Universidad Industrial de Santander, Bucaramanga, Colombia b Departamento de Física y Geología. Universidad de Pamplona, Pamplona, Colombia c Centro de Investigaciones Ópticas (CCT La Plata, CONICET-CIC) P.O. Box 124, La Plata (1900), Argentina and UID OPTIMO, Facultad Ingeniería, Universidad Nacional de La Plata, La Plata, Argentina d Facultad Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina |
| Abstract: | An optical technique for slope detection by using as storing medium a photorefractive BSO crystal is proposed. The technique relays in that a local tilt produced in a diffusing reflective surface can be mapped as a speckle transversal shifting in a plane perpendicular to the optical axis. The volume nature of the storing medium is quite adequate to highlight the speckle volume nature and its associated properties. Experimental results obtained by using a rubber vibrating membrane are presented. |
| Keywords: | Modulated speckle Photorefractive crystals |
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