Rough diffraction gratings: applications to linear optical encoders
In this Thesis work we present theoretical, numerical and experimental analyses of the behavior of non-perfect diffraction gratings. We have permormed an analyses of diffraction gratings engraved on a steel tape. This kind of gratings can be found in industrial devices such as optical encoders for l...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/48866 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/48866 |
| Access Level: | acceso abierto |
| Palabra clave: | 535.42(043.2) Difracción Redes de difracción Diffraction gratings Óptica (Física) 2209.19 Óptica Física |
| Sumario: | In this Thesis work we present theoretical, numerical and experimental analyses of the behavior of non-perfect diffraction gratings. We have permormed an analyses of diffraction gratings engraved on a steel tape. This kind of gratings can be found in industrial devices such as optical encoders for long range measurements (> 3 m). The main objectives of this Thesis work are to find a theoretical formalism which describes the behavior of this kind of gratings in near and far field approaches. We also propose a new kind of diffraction grating based on periodical variations in the micro-topographic properties of the surface. Besides, we analyze other kind of imperfections in gratings like rough edges, which can be produced during the fabrication process. Another important result is the cancellation of Talbot effect using masks formed by two gratings. This Thesis work has been motivated by a long collaboration with private industry related with fabrication of high accuracy metrology systems. |
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