Correlation technique for the compensation of diffraction widening of optical reference signals

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dc.contributor.authorSaez Landete, José
dc.contributor.authorAlonso Fernández, José
dc.contributor.authorSánchez Brea, Luis Miguel
dc.contributor.authorMorlanes Calvo, Tomás
dc.contributor.authorBernabeu Martínez, Eusebio
dc.date.accessioned2023-06-20T03:42:35Z
dc.date.available2023-06-20T03:42:35Z
dc.date.issued2009-09-01
dc.description© 2009 Optical Society of America. This work has been supported by Center for Innovation in Transport (CENIT) project “Tecnologías avanzadas para los equipos y procesos de fabricación de 2015: e-eficiente, e-cológica, e-máquina (eEe)” of the Ministerio de Industria, Turismo y Comercio of Spain and by the Madrid Autonomous Community-University of Alcalá de Henares (CAM-UAH) project CCG08-UAH/TIC-3941.
dc.description.abstractTwo-grating measurement systems are routinely employed for high-resolution measurements of angular and linear displacement. Usually, these systems incorporate zero reference codes (ZRCs) to obtain a zero reference signal (ZRS), which is used as a stage-homing signal. This signal provides absolute information of the position to the otherwise relative information provided by the two-grating incremental subsystems. A zero reference signal is commonly obtained illuminating the superposition of two identical pseudorandom codes and registering the transmitted light by means of a photodiode. To increase the resolution of the system, a reduction of the grating period and the ZRC widths is required. Due to this reduction, the diffractive effects produce a widening of the ZRS and, in turn, a loss of the measuring accuracy. In this work, we propose a method to narrow the distorted signal obtained with a Lau-based encoder, reinstating the accuracy of the ZRS. The method consists of the inclusion of a correlation mask on the detector. A theoretical model to design the mask has been developed, and experimental results have been obtained that validate the proposed technique.
dc.description.departmentDepto. de Óptica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipCentro de Innovación del Transporte (CENIT), España
dc.description.sponsorshipMinisterio de Industria, Turismo y Comercio, España
dc.description.sponsorshipComunidad Autónoma de Madrid (CAM)
dc.description.sponsorshipUniversidad Autónoma de Madrid (UAM)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/26222
dc.identifier.citation1. L. M. Sanchez-Brea and T. Morlanes, “Metrological errors in optical encoders”, Meas. Sci. Technol. 19, 1-8 (2008). 2. D. Crespo, J. Alonso, and E. Bernabeu, “Generalized grating imaging using an extended monochromatic light source”, J. Opt. Soc. Am. A 17, 1231-1240 (2000). 3. D. Crespo, J. Alonso, T. Morlanes, and E. Bernabeu, “Optical encoder based on the Lau effect”, Opt. Eng. (Bellingham) 39, 817-24 (2000). 4. L. M. Sanchez-Brea, J. Sáez-Landete, J. Alonso, and E. Bernabeu, “Invariant grating pseudoimaging using polychromatic light and a finite extension source”, Appl. Opt. 47, 1470-1477 (2008). 5. Y. Xiangyang and Y. Chunyong, “A new method for design of zero reference marks for grating measurement systems”, J. Phys. E 19, 34-37 (1986). 6. Y. Li, “Autocorrelation function of a bar code system”, J. Mod. Opt. 34, 1571-1575 (1987). 7. Y. Li, “Optical valve using bar codes”, Optik (Stuttgart) 79, 67-74 (1988). 8. J. Sáez-Landete, J. Alonso, and E. Bernabeu, “Design of zero reference codes by means of a global optimization method”, Opt. Express 13, 195-201 (2005). 9. J. Sáez-Landete, S. Salcedo-Sanz, M. Rosa-Zurera, J. Alonso, and E. Bernabeu, “Optimal design of optical reference signals using a genetic algorithm”, Opt. Lett. 30, 2724-2726 (2005). 10. J. Sáez-Landete, S. Salcedo-Sanz, M. Rosa-Zurera, J. Alonso, and E. Bernabeu, “Generation of optical reference signals robust to diffractive effects”, IEEE Photon. Technol. Lett. 19, 1133-1135 (2007). 11. E. E. Fenimore and T. M. Cannon, “Coded aperture imaging with uniformly redundant arrays”, Appl. Opt. 17, 337-347 (1978). 12. J. Jahns and A. W. Lohmann, “The Lau effect (a diffraction experiment with incoherent illumination)”, Opt. Commun. 28, 263-267 (1979). 13. L. Mertz, Transformations in Optics (Wiley, 1965). 14. W. K. Pratt, Digital Image Processing (Wiley, 1991).
dc.identifier.doi10.1364/JOSAA.26.001901
dc.identifier.issn1084-7529
dc.identifier.officialurlhttp://dx.doi.org/10.1364/JOSAA.26.001901
dc.identifier.relatedurlhttp://www.opticsinfobase.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/44293
dc.issue.number9
dc.journal.titleJournal of The Optical Society Of America A-Optics Image Science and Vision
dc.language.isoeng
dc.page.final1906
dc.page.initial1901
dc.publisherOptical Society of America
dc.relation.projectIDTecnologías avanzadas para los equipos y procesos de fabricación de 2015: e-eficiente, e-cológica, e-máquina (eEe)
dc.relation.projectIDCCG08-UAH/TIC-3941
dc.rights.accessRightsopen access
dc.subject.cdu535
dc.subject.keywordDesign
dc.subject.keywordCodes
dc.subject.keywordLight
dc.subject.ucmÓptica (Física)
dc.subject.unesco2209.19 Óptica Física
dc.titleCorrelation technique for the compensation of diffraction widening of optical reference signals
dc.typejournal article
dc.volume.number26
dspace.entity.typePublication
relation.isAuthorOfPublicationf7b5b178-742c-418d-80d3-769a169f6dd9
relation.isAuthorOfPublication72f8db7f-8a25-4d15-9162-486b0f884481
relation.isAuthorOfPublication.latestForDiscoveryf7b5b178-742c-418d-80d3-769a169f6dd9
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