Dr. José Manuel Ramos-Rodríguez Profile

Dr. José Manuel Ramos-Rodríguez

Assistant Professor at Wooptix SL

SPIE Involvement:

Conference Program Committee | Author

Publications (54)

Proceedings Article | 10 April 2024 Poster + Paper

New optical metrology technique for measuring the shape of a lithography photo mask

Guillermo Castro Luis, Kiril Ivanov Kurtev, Miguel Jiménez, Juan Trujillo-Sevilla, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12955, 129553L (2024) https://doi.org/10.1117/12.3011886

KEYWORDS: Photomasks, Reflection, Chromium, Pellicles, Quartz, Semiconducting wafers, Wavefronts, Lithography, Neodymium, Phase imaging

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Proceedings Article | 11 March 2024 Presentation + Paper

Repeatability study of silicon wafer shape measurements

Miguel Jiménez, Kiril Ivanov Kurtev, Juan Trujillo-Sevilla, Rubén Abrante, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12893, 128930E (2024) https://doi.org/10.1117/12.2692506

KEYWORDS: Semiconducting wafers, Silicon, Cameras, Photovoltaics, Mirrors, Wavefronts, Reflection, Data acquisition, Calibration, Phase imaging

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Proceedings Article | 5 January 2024 Paper

Zernike coefficients of digital holographic optical elements

Jung-Young Son, Tetiana Venkel, Jung Kim, J. Rodriguez-Ramos, J. Marichal-Hernandez

Proceedings Volume 12938, 1293821 (2024) https://doi.org/10.1117/12.3014855

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Proceedings Article | 28 September 2023 Presentation + Paper

New patterned silicon wafer shape metrology system

Kiril Ivanov Kurtev, Juan Trujillo-Sevilla, Guillermo Castro Luis, Miguel Jiméneza, Rubén Abrante, José Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12665, 126650A (2023) https://doi.org/10.1117/12.2678349

KEYWORDS: Semiconducting wafers, Silicon, Data acquisition, Reflection, Wavefronts, Image sensors, Cameras, Wafer-level optics, Photovoltaics, Metrology

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On-product overlay (OPO), with its continually shrinking overlay budget, remains a constraint in the continued effort at increasing device yield. Overlay metrology capability currently lags the need for improved overlay control, especially for multi-patterning applications. The free form shape of the silicon wafer is critical for process monitoring and is usually controlled through bow and warp measurements during the process flow. As the OPO budget shrinks, non-lithography process induced stress causing in plane distortions (IPD) becomes a more dominant contributor to the shrinking overlay budget. To estimate the wafer process induced IPD parameters after cucking the wafer inside the lithographic scanner, a high-resolution measurement of the freeform wafer shape of the unclamped wafer is needed. The free form wafer shape can then be used in a feed-forward prediction algorithm to predict both intra field and intra die distortions, as has been published by ASML, to minimize the need for alignment marks on the die and wafer and allows for overlay to be performed at any lithography layer. Up until now, the semiconductor industry has been using Coherent Gradient Sensing (CGS) interferometry or Fizeau interferometry to generate the wave front phase from the reflecting wafer surface. The wave front phase is then used to calculate the slope which again generates a shape map of the silicon wafer. However, these techniques have only been available for 300mm wafers. In this paper we introduce Wave Front Phase Imaging (WFPI), a new technique that can measure the free form wafer shape of a patterned silicon wafer using only the intensity of the reflected light. In the WFPI system, the wafer is held vertically to avoid the effects of gravity during measurements. The wave front phase is then measured by acquiring only the 2- dimensional intensity distribution of the reflected non-coherent light at two or more distances along the optical path using a standard, low noise, CMOS sensor. This method allows for very high data acquisition speed, equal to the camera’s shutter time, and a high number of data points with the same number of pixels as available in the digital imaging sensor. In the measurements presented in this paper, we acquired 7.3 million data points on a full 200mm patterned silicon wafer with a lateral resolution of 65μm. The same system presented can also acquire data on a 300mm silicon wafer in which case 16.3 million data points with the same 65μm spatial resolution were collected.

Proceedings Article | 27 April 2023 Poster + Paper

New metrology technique for measuring the free shape of a patterned 300mm wafer held vertically

Juan Trujillo-Sevilla, Óscar Casanova-González, Alex Roqué-Velasco, Miguel Jesús Sicilia, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12496, 124963G (2023) https://doi.org/10.1117/12.2661903

KEYWORDS: Semiconducting wafers, Silicon, Reflection, Wavefronts, Data acquisition, Cameras, Wafer-level optics, Image sensors, Phase imaging, Metrology

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Proceedings Article | 8 March 2023 Presentation + Paper

New wafer shape measurement technique for 300mm blank vertically held silicon wafer

Juan Trujillo-Sevilla, Óscar Casanova-González, Alex Roqué-Velasco, Javier González Pardo, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12428, 124280U (2023) https://doi.org/10.1117/12.2651981

KEYWORDS: Semiconducting wafers, Silicon, Wavefronts, Reflection, Data acquisition, Collimation, Camera shutters, Overlay metrology, Gaussian filters, Cameras

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Proceedings Article | 7 December 2022 Poster + Paper

New wavefront phase sensor used for 3D shape measurements of silicon wafers

Juan Trujillo-Sevilla, Alex Roqué-Velasco, Miguel Jesús Sicilia, Óscar Casanova-González, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12274, 122741F (2022) https://doi.org/10.1117/12.2645969

KEYWORDS: Semiconducting wafers, Silicon, Wavefronts, Cameras, Sensors, Reflectivity, 3D metrology, Wafer-level optics, Phase imaging, Image sensors

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Proceedings Article | 1 December 2022 Presentation + Paper

New wave front phase sensor used for 3D shape measurements of patterned silicon wafers

Juan Trujillo-Sevilla, Óscar Casanova-González, Alex Roqué-Velasco, Miguel Jesús Sicilia, Javier González Pardo, José Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 12292, 122920P (2022) https://doi.org/10.1117/12.2642287

KEYWORDS: Semiconducting wafers, Silicon, Wavefronts, Metals, Data acquisition, Image sensors, Reflectivity, Surface finishing, Interferometry, Beam splitters

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Proceedings Article | 3 October 2022 Presentation + Paper

Wave front phase imaging for silicon wafer metrology

Juan Trujillo-Sevilla, Alex Roqué-Velasco, Miguel Jesús Sicilia, Óscar Casanova-González, José Manuel Rodríguez-Ramos, Jan Gaudestad

Proceedings Volume 12216, 1221605 (2022) https://doi.org/10.1117/12.2632499

KEYWORDS: Semiconducting wafers, Silicon, Wavefronts, Cameras, Reflectivity, Phase imaging, Metrology, Image sensors, Data acquisition, Wafer-level optics

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Proceedings Article | 27 May 2022 Presentation + Paper

A local real-time bar detector based on the multiscale Radon transform

Ricardo Oliva-García, Óscar Gómez-Cárdenes, José Marichal-Hernández, Javier Martín-Hernández, Jonas Phillip-Lüke, José Rodríguez-Ramos

Proceedings Volume 12102, 121020A (2022) https://doi.org/10.1117/12.2617411

KEYWORDS: Sensors, Radon transform, Digital signal processing, Mobile devices, Detection and tracking algorithms, Image processing, Image segmentation, System on a chip, Lanthanum, Hough transforms

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Proceedings Article | 27 May 2022 Presentation + Paper

A fast but ill-conditioned formal inverse to Radon transforms in 2D and 3D

Ricardo Oliva-García, José Marichal-Hernández, Óscar Gómez-Cárdenes, Nelson Suárez-Martín, José Rodríguez-Ramos

Proceedings Volume 12102, 1210209 (2022) https://doi.org/10.1117/12.2617409

KEYWORDS: Radon transform, Transform theory, Radon, Point spread functions, MATLAB, Medical imaging, Deconvolution

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Proceedings Article | 26 May 2022 Presentation + Paper

New metrology technique for measuring patterned wafer geometry on a full 300mm wafer

Juan Trujillo-Sevilla, José Manuel Rodríguez-Ramos, Jan Gaudestad, Tom Osterheld, Benjamin Cherian, Brian Brown

Proceedings Volume 12053, 1205303 (2022) https://doi.org/10.1117/12.2614320

KEYWORDS: Semiconducting wafers, Silicon, Gaussian filters, Wavefronts, Wafer-level optics, Metrology, Cameras, Overlay metrology, Imaging systems, Data acquisition

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Proceedings Article | 5 March 2022 Presentation + Paper

New high repeatability wafer geometry measurement technique for full 200mm and 300mm blank wafers

Juan Trujillo-Sevilla, Álvaro Pérez-García, Óscar Casanova-González, Miriam Velasco-Ocaña, Sabato Ceruso, Ricardo Oliva-García, Óscar Gómez-Cárdenes, Javier Martín-Hernández, Alex Roqué-Velasco, José Manuel Rodríguez-Ramos, Jan Gaudestad

Proceedings Volume 12008, 120080A (2022) https://doi.org/10.1117/12.2607315

KEYWORDS: Semiconducting wafers, Photovoltaics, Silicon, Cameras, Data acquisition, Gaussian filters, Wavefronts, Lithography, Imaging systems

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Proceedings Article | 28 October 2021 Presentation + Paper

Stria measurement using wave front phase imaging on a transparent plate

Juan M. Trujillo-Sevilla, Oscar Casanova-González, Miriam Velasco-Ocaña, Sabato Ceruso, Ricardo Oliva-García, Óscar Gómez-Cárdenes, Javier Martín-Hernández, Alex Roqué-Velasco, Alvaro Pérez-García, José Manuel Rodríguez-Ramos, Jan Gaudestad

Proceedings Volume 11889, 118891I (2021) https://doi.org/10.1117/12.2605328

KEYWORDS: Wavefronts, Glasses, Phase imaging, Spatial frequencies, Refractive index, Manufacturing, Visualization, Reflectivity, Optical sensors, Light wave propagation

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Proceedings Article | 12 October 2021 Poster + Presentation + Paper

New metrology technique for measuring wafer geometry on a full 300mm silicon wafer

Juan Trujillo-Sevilla, Óscar Casanova-González, Miriam Velasco-Ocaña, Sabato Ceruso, Ricardo Oliva-García, Óscar Gómez-Cárdenes, Javier Martín-Hernández, Alex Roqué-Velasco, Álvaro Pérez-García, Jose Manuel Ramos-Rodríguez, Jan Gaudestad

Proceedings Volume 11854, 118541B (2021) https://doi.org/10.1117/12.2605516

KEYWORDS: Semiconducting wafers, Silicon, Photovoltaics, Gaussian filters, Data acquisition, Wavefronts, Metrology, Cameras, Overlay metrology, Image sensors

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SPIE Journal Paper | 29 September 2020

Three-dimensional multiscale discrete Radon and John transforms

José Manuel Rodríguez-Ramos, José Gil Marichal-Hernandez, Óscar Gómez-Cárdenes, Fernando Rosa González, Do Hyung Kim

OE, Vol. 59, Issue 09, 093104, (September 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.9.093104

KEYWORDS: Transform theory, Radon, Radon transform, Optical engineering, Rutherfordium, Integral transforms, Fourier transforms, X-rays, Spherical lenses, 3D image processing

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Proceedings Article | 22 April 2020 Presentation + Paper

Free view point generation based on depth maps computed by a single camera

Ricardo Oliva-García, Jan Gaudestad, Javier Martin-Hernandez, Ángela Hernández-Delgado, Óscar Gómez-Cárdenes, Jonas Lüke, José M. Rodríguez-Ramos

Proceedings Volume 11402, 114020P (2020) https://doi.org/10.1117/12.2558063

KEYWORDS: Cameras, Matrices, Head, 3D image processing, Image interpolation

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Proceedings Article | 20 March 2020 Paper

High speed roughness measurement on blank silicon wafers using wave front phase imaging

J. M. Trujillo-Sevilla, J. M. Rodríguez-Ramos, J. Gaudestad

Proceedings Volume 11325, 113252W (2020) https://doi.org/10.1117/12.2547406

KEYWORDS: Semiconducting wafers, Silicon, Wafer-level optics, Wavefronts, Signal to noise ratio, Image resolution, Image sensors, Cameras, Linear filtering, Robotics

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Proceedings Article | 2 March 2020 Presentation + Paper

Wave front phase imaging of wafer geometry using high pass filtering to reveal nanotopography

J. M. Trujillo-Sevilla, J. M. Ramos-Rodríguez, J. Gaudestad

Proceedings Volume 11287, 112870W (2020) https://doi.org/10.1117/12.2547405

KEYWORDS: Semiconducting wafers, Silicon, Wafer-level optics, Wavefronts, Image resolution, Image sensors, Signal to noise ratio, Cameras, Linear filtering, Manufacturing

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Proceedings Article | 19 February 2020 Paper

New high-resolution wave ophthalmic instrument for the characterizing ocular optics

Sergio Bonaque-González, Juan M. Trujillo-Sevilla, Oscar Casanova-González, David Carmona-Ballester, Miguel Sicilia-Cabrera, Sabato Ceruso, Jan Gaudestad, José M. Rodríguez-Ramos

Proceedings Volume 11218, 112181W (2020) https://doi.org/10.1117/12.2548595

KEYWORDS: Sensors, Eye, Wavefront sensors, Image resolution, Wavefronts, Error analysis, Ophthalmology, Distance measurement, Actuators, Diagnostics

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Proceedings Article | 14 May 2019 Paper

Calibration method applied to a tunable tensor display system

David Carmona-Ballester, Viana Guadalupe-Suárez, Juan Trujillo-Sevilla, Sergio Bonaque-González, Ricardo Oliva-García, Jose Marichal-Hernández, Miguel Sicilia-Cabrera, Lara Díaz-García, Jose Rodríguez-Ramos

Proceedings Volume 10997, 1099709 (2019) https://doi.org/10.1117/12.2518865

KEYWORDS: Calibration, LCDs, Computing systems, Lanthanum, Liquid crystals, Polarizers, Displays, Multilayers, Prototyping, Polarization

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Proceedings Article | 14 May 2019 Paper

Simultaneous computation of discrete Radon transform quadrants for efficient implementation on real time systems

Ricardo Oliva-García, Óscar Gómez-Cárdenes, David Carmona-Ballester, José Marichal-Hernández, José Rodríguez-Ramos

Proceedings Volume 10996, 109960O (2019) https://doi.org/10.1117/12.2518601

KEYWORDS: Radon transform, Transform theory, Computer programming, Algorithms, Computed tomography

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Proceedings Article | 4 March 2019 Presentation + Paper

High-resolution wave front phase sensor for silicon wafer metrology

J. M. Trujillo-Sevilla, O. Casanova Gonzalez, S. Bonaque-González, J. Gaudestad, J. M. Rodríguez Ramos

Proceedings Volume 10925, 109250I (2019) https://doi.org/10.1117/12.2505764

KEYWORDS: Semiconducting wafers, Confocal microscopy, Wavefronts, Mirrors, Data acquisition, Silicon, Sensors, Metrology

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Proceedings Article | 16 May 2018 Presentation + Paper

Privacy-enabled displays

David Carmona-Ballester, Juan Trujillo-Sevilla, Lara Díaz-García, Daniel Walo, Ángela Hernández-Delgado, Juan Fernández-Valdivia, Óscar Casanova-González, Óscar Gómez-Cárdenes, José Rodríguez-Ramos

Proceedings Volume 10666, 1066609 (2018) https://doi.org/10.1117/12.2306029

KEYWORDS: Multilayers, Image filtering, Linear filtering, 3D displays, Lanthanum, Optical filters, Eye, Spatial frequencies, Quality measurement, Reconstruction algorithms

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SPIE Journal Paper | 12 May 2018 Open Access

Simulations and laboratory performance results of the weighted Fourier phase slope centroiding algorithm in a Shack–Hartmann sensor

Haresh Mangharam Chulani, Jose Manuel Rodríguez-Ramos

OE, Vol. 57, Issue 05, 053107, (May 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.5.053107

KEYWORDS: Sensors, Spatial frequencies, Device simulation, Error analysis, Computer simulations, Photons, Detection and tracking algorithms, Image filtering, Wavefront sensors, Adaptive optics

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SPIE Journal Paper | 23 January 2018

Analyzing the impact of the initialization for the nonnegative tensor factorization in tensor displays

David Carmona-Ballester, Juan Manuel Trujillo-Sevilla, Sergio Bonaque-González, Ángela Hernández-Delgado, José Manuel Rodríguez-Ramos

OE, Vol. 57, Issue 06, 061603, (January 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.6.061603

KEYWORDS: 3D displays, LCDs, Lanthanum, Optical engineering, Reconstruction algorithms, Signal to noise ratio, Multiplexing, 3D image processing, Translucency, Display technology

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Proceedings Article | 10 May 2017 Presentation + Paper

Focus measurement in 3D focal stack using direct and inverse discrete radon transform

Óscar Gómez-Cárdenes, José G. Marichal-Hernández, Juan Trujillo-Sevilla, David Carmona-Ballester, José Rodríguez-Ramos

Proceedings Volume 10219, 102190R (2017) https://doi.org/10.1117/12.2261921

KEYWORDS: Radon transform, 3D image processing, 3D metrology, Integral imaging, Stereoscopy, Computational imaging, Cameras, Wavelet transforms, Wavelets, Radon, Image filtering, Eye, Image quality, Image restoration, Interference (communication)

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Proceedings Article | 9 August 2016 Paper

An instrumental puzzle: the modular integration of AOLI

Roberto López, Sergio Velasco, Carlos Colodro-Conde, Juan J. Valdivia, Marta Puga , Alejandro Oscoz, Rafael Rebolo, Craig MacKay, Antonio Pérez-Garrido, Luis Fernando Rodríguez-Ramos, José Manuel Rodríguez-Ramos, David King, Lucas Labadie, Balaji Muthusubramanian, Gustavo Rodríguez-Coira

Proceedings Volume 9908, 99082Z (2016) https://doi.org/10.1117/12.2231980

KEYWORDS: Adaptive optics, Telescopes, Imaging systems, Lithium, Sensors, Calibration, Lanthanum, Cameras, Electron multiplying charge coupled devices, Mirrors

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Proceedings Article | 9 August 2016 Paper

AOLI: near-diffraction limited imaging in the visible on large ground-based telescopes

Craig Mackay, Rafael Rebolo, David King, Lucas Labadie, Marta Puga, Antonio Pérez Garrido, Carlos Colodro-Conde, Roberto Lopez, Balaji Muthusubramanian, Alejandro Oscoz, J. Rodríguez Ramos, Luis Rodrigo-Ramos, J. J. Fernandez-Valdivia, Sergio Velasco

Proceedings Volume 9908, 99080M (2016) https://doi.org/10.1117/12.2230900

KEYWORDS: Telescopes, Adaptive optics, Wavefront sensors, Cameras, Mirrors, Wavefronts, Sensors, Stars, Lanthanum, Hubble Space Telescope

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Proceedings Article | 22 May 2015 Paper

Lightfield super-resolution through turbulence

Juan Trujillo-Sevilla, Juan Fernández-Valdivia, Luis Rodríguez-Ramos, Óscar Cárdenes, José G. Marichal-Hernández, Bahram Javidi, José Rodríguez-Ramos

Proceedings Volume 9495, 94950Q (2015) https://doi.org/10.1117/12.2177295

KEYWORDS: Wavefronts, Deconvolution, Turbulence, Microlens, Super resolution, Optical resolution, Phase measurement, Point spread functions, Telescopes, Cameras

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Proceedings Article | 15 May 2014 Paper

Refocusing from a plenoptic camera within seconds on a mobile phone

Óscar Gómez-Cárdenes, José Marichal-Hernández, Fernando Rosa, Jonas Lüke, Juan José Fernández-Valdivia, José Rodríguez-Ramos

Proceedings Volume 9139, 913907 (2014) https://doi.org/10.1117/12.2053186

KEYWORDS: Neon, Tablets, Cameras, Cell phones, Transform theory, Optimization (mathematics), Galactic astronomy, Algorithm development, Radon transform, System on a chip

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Proceedings Article | 15 May 2014 Paper

Tomographic wavefront retrieval by combined use of geometric and plenoptic sensors

J. Trujillo-Sevilla, L. Rodríguez-Ramos, Juan Fernández-Valdivia, José Marichal-Hernández, J. Rodríguez-Ramos

Proceedings Volume 9141, 914129 (2014) https://doi.org/10.1117/12.2053150

KEYWORDS: Sensors, Wavefronts, Stars, Microlens, Tomography, Telescopes, Adaptive optics, Atmospheric turbulence, Microlens array, Atmospheric optics

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Proceedings Article | 17 May 2013 Paper

On the application of the plenoptic camera to mobile phones

Icíar Montilla, Marta Puga, J. G. Marichal-Hernandez, J. P. Lüke, J. M. Rodríguez-Ramos

Proceedings Volume 8667, 866702 (2013) https://doi.org/10.1117/12.2013473

KEYWORDS: Cameras, Cell phones, Microlens array, Sensors, 3D image processing, Imaging systems, Stereoscopic cameras, Calibration, Medical imaging, Staring arrays

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SPIE Journal Paper | 9 May 2013 Open Access

Tip-tilt restoration of a segmented optical mirror using a geometric sensor

Juan José Fernández-Valdivia, Alberto Sedano, Sergio Chueca, Javier Gil, Jose Manuel Ridriguez-Ramos

OE, Vol. 52, Issue 05, 056601, (May 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.5.056601

KEYWORDS: Image segmentation, Wavefronts, Sensors, Mirrors, Zernike polynomials, Telescopes, Geometrical optics, Device simulation, Computer architecture, Segmented mirrors

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Proceedings Article | 13 September 2012 Paper

Concepts, laboratory, and telescope test results of the plenoptic camera as a wavefront sensor

L. Rodríguez-Ramos, I. Montilla, J. Fernández-Valdivia, J. Trujillo-Sevilla, J. Rodríguez-Ramos

Proceedings Volume 8447, 844745 (2012) https://doi.org/10.1117/12.925327

KEYWORDS: Cameras, Wavefront sensors, Telescopes, Wavefronts, Microlens, Sensors, Image sensors, Turbulence, Space telescopes, Photography

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SPIE Journal Paper | 3 July 2012

Fast approximate 4-D/3-D discrete radon transform for lightfield refocusing

Jose Marichal-Hernandez, Jonas Philipp Lüke, Fernando Rosa González, José Manuel Rodríguez-Ramos

JEI, Vol. 21, Issue 2, 023026, (July 2012) https://doi.org/10.1117/12.10.1117/1.JEI.21.2.023026

KEYWORDS: Radon transform, Sensors, Cameras, Photography, Algorithm development, Microlens, Binary data, Video acceleration, Video, Image processing

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Proceedings Article | 15 May 2012 Paper

Atmospherical wavefront phases using the plenoptic sensor (real data)

L. Rodríguez-Ramos, I. Montilla, J. P. Lüke, R. López, J. G. Marichal-Hernández, J. Trujillo-Sevilla, B. Femenía, M. López, J. J. Fernández-Valdivia, M. Puga, F. Rosa, J. M. Rodríguez-Ramos

Proceedings Volume 8384, 83840D (2012) https://doi.org/10.1117/12.923662

KEYWORDS: Sensors, Wavefronts, Telescopes, Sodium, Wavefront sensors, Turbulence, Adaptive optics, Microlens, Atmospheric sensing, Cameras

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Proceedings Article | 20 May 2011 Paper

3D imaging and wavefront sensing with a plenoptic objective

J. M. Rodríguez-Ramos, J. P. Lüke, R. López, J. G. Marichal-Hernández, I. Montilla, J. Trujillo-Sevilla, B. Femenía, M. Puga, M. López, J. J. Fernández-Valdivia, F. Rosa, C. Dominguez-Conde, J. C. Sanluis, L. F. Rodríguez-Ramos

Proceedings Volume 8043, 80430R (2011) https://doi.org/10.1117/12.883813

KEYWORDS: Microlens, Cameras, Sensors, Wavefronts, Microlens array, Telescopes, Adaptive optics, Calibration, Field programmable gate arrays, Wavefront sensors

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Proceedings Article | 2 February 2011 Paper

Fast approximate 4D:3D discrete radon transform, from light field to focal stack with O(N4) sums

José Marichal-Hernández, Jonas Lüke, Fernando Rosa, José Rodríguez-Ramos

Proceedings Volume 7871, 78710G (2011) https://doi.org/10.1117/12.872359

KEYWORDS: Sensors, Transform theory, Radon transform, Photography, Cameras, Algorithm development, Binary data, Image processing, Video processing, Lanthanum

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Proceedings Article | 29 July 2010 Paper

Multiconjugate adaptive optics with plenoptic cameras and the Fourier transform reconstructor

I. Montilla, M. Reyes, B. Femenía, J. Rodríguez-Ramos

Proceedings Volume 7736, 773641 (2010) https://doi.org/10.1117/12.857100

KEYWORDS: Fourier transforms, Sensors, Reconstruction algorithms, Cameras, Wavefronts, Adaptive optics, Device simulation, Telescopes, Tomography, Stars

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Proceedings Article | 18 September 2009 Paper

Performance of a modal zone wavefront recovery algorithm (Hudgin) implemented on FPGAs for its use in ELTs

José Javier Díaz-García, Alberto Dávila-González, Luis-Fernando Rodríguez-Ramos, José-Manuel Rodríguez-Ramos, Yolanda Martín-Hernando, Juan-José Piqueras-Meseguer

Proceedings Volume 7439, 74390K (2009) https://doi.org/10.1117/12.829100

KEYWORDS: Sensors, Adaptive optics, Field programmable gate arrays, Telescopes, Wavefronts, Space telescopes, Spatial resolution, Dysprosium, Atmospheric corrections, Deformable mirrors

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Proceedings Article | 18 September 2009 Paper

The plenoptic camera as a wavefront sensor for the European Solar Telescope (EST)

Luis Rodríguez-Ramos, Yolanda Martín, José Díaz, J. Piqueras, J. Rodríguez-Ramos

Proceedings Volume 7439, 74390I (2009) https://doi.org/10.1117/12.828578

KEYWORDS: Wavefront sensors, Microlens, Cameras, Wavefronts, Telescopes, Sensors, Adaptive optics, Image sensors, Spatial frequencies, Actuators

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Proceedings Article | 23 July 2008 Paper

Static telescope aberration measurement and correction using lucky imaging techniques

M. López Marrero, L. Rodríguez Ramos, J. Rodríguez Ramos

Proceedings Volume 7018, 70183L (2008) https://doi.org/10.1117/12.787413

KEYWORDS: Wavefronts, Point spread functions, Telescopes, Fourier transforms, Zernike polynomials, Stars, Algorithm development, Monochromatic aberrations, Wavefront sensors, Field programmable gate arrays

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Proceedings Article | 16 July 2008 Paper

FPGA-based slope computation for ELTs adaptive optics wavefront sensors

L. F. Rodríguez Ramos, J. J. Díaz Garcia, J. J. Piqueras Meseguer, Y. Martin Hernando, J. M. Rodríguez Ramos

Proceedings Volume 7015, 701530 (2008) https://doi.org/10.1117/12.787412

KEYWORDS: Sensors, Field programmable gate arrays, Wavefront sensors, Calibration, Adaptive optics, Wavefronts, Laser guide stars, Logic, Telescopes, Control systems

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Proceedings Article | 15 July 2008 Paper

Wavefront and distance measurement using the CAFADIS camera

J. Rodríguez-Ramos, B. Femenía Castellá, F. Pérez Nava, S. Fumero

Proceedings Volume 7015, 70155Q (2008) https://doi.org/10.1117/12.789380

KEYWORDS: Telescopes, Wavefronts, Sensors, Adaptive optics, Sodium, Cameras, Distance measurement, Wavefront sensors, Space telescopes, Device simulation

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Proceedings Article | 11 July 2008 Paper

2D-FFT implementation on FPGA for wavefront phase recovery from the CAFADIS camera

J. Rodríguez-Ramos, E. Magdaleno Castelló, C. Domínguez Conde, M. Rodríguez Valido, J. Marichal-Hernández

Proceedings Volume 7015, 701539 (2008) https://doi.org/10.1117/12.789312

KEYWORDS: Field programmable gate arrays, Cameras, Wavefronts, Transform theory, Clocks, Sensors, Adaptive optics, Telescopes, Prototyping, Wavefront sensors

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Proceedings Article | 11 July 2008 Paper

Real-time phase slopes calculations by correlations using FPGAs

J. Trujillo Sevilla, M. Valido, L. Rodríguez Ramos, E. Boemo, F. Rosa, J. Rodríguez Ramos

Proceedings Volume 7015, 70153B (2008) https://doi.org/10.1117/12.789492

KEYWORDS: Field programmable gate arrays, Wavefronts, Wavefront sensors, Algorithm development, Sensors, Image processing, Adaptive optics, Image sensors, Multiplexers, Optical correlators

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Proceedings Article | 10 July 2008 Paper

Performance of the Fourier transform reconstructor for the European Extremely Large Telescope

I. Montilla, M. Reyes, M. Le Louarn, J. Marichal-Hernández, J. Rodríguez-Ramos, L. Rodríguez-Ramos

Proceedings Volume 7015, 70152Y (2008) https://doi.org/10.1117/12.787374

KEYWORDS: Adaptive optics, Actuators, Fourier transforms, Reconstruction algorithms, Stars, Computer simulations, Large telescopes, Sensors, Atmospheric optics, Deformable mirrors

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SPIE Journal Paper | 1 April 2007

Modal Fourier wavefront reconstruction using graphics processing units

José Marichal-Hernandez, José Rodríguez-Ramos, Fernando Rosa

JEI, Vol. 16, Issue 02, 023005, (April 2007) https://doi.org/10.1117/12.10.1117/1.2732379

KEYWORDS: Adaptive optics, Wavefront reconstruction, Wavefronts, Visualization, Reconstruction algorithms, Actuators, Binary data, Fourier transforms, Telescopes, Signal processing

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Proceedings Article | 27 June 2006 Paper

Modal Fourier wavefront reconstruction using graphics processing units

José Rodríguez-Ramos, José Marichal-Hernández, Fernando Rosa

Proceedings Volume 6272, 627215 (2006) https://doi.org/10.1117/12.670406

KEYWORDS: Adaptive optics, Wavefronts, Visualization, Reconstruction algorithms, Fourier transforms, Actuators, Binary data, Wavefront reconstruction, Telescopes, Signal processing

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Proceedings Article | 11 November 2004 Paper

Wavefront phase recovery using graphic processing units (GPUs)

Fernando Rosa, Jose Marichal-Hernandez, Jose Rodriguez-Ramos

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.564777

KEYWORDS: Wavefronts, Wavefront sensors, Telescopes, Sensors, Chemical elements, Visualization, Adaptive optics, Fourier transforms, Atmospheric optics, Computer programming

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Proceedings Article | 20 July 2000 Paper

Phasing of segmented mirrors: new algorithm and numerical results for piston detection

Jose Rodriguez-Ramos, Jesus Fuensalida

Proceedings Volume 4003, (2000) https://doi.org/10.1117/12.391516

KEYWORDS: Sensors, Atmospheric turbulence, Wavefronts, Segmented mirrors, Telescopes, Wavefront sensors, Image segmentation, Mirrors, Adaptive optics, Iterative methods

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Proceedings Article | 17 October 1997 Paper

Alignment of the elements of a segmented mirror using different combinations of wavefront sensors: numerical simulations

Jose Rodriguez-Ramos, Jesus Fuensalida

Proceedings Volume 3126, (1997) https://doi.org/10.1117/12.279054

KEYWORDS: Sensors, Wavefronts, Wavefront sensors, Segmented mirrors, Image segmentation, Numerical simulations, Mirrors, Telescopes, Error analysis, Atmospheric turbulence

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Proceedings Article | 21 March 1997 Paper

Piston detection of a segmented mirror telescope using a curvature sensor: preliminary results with numerical simulations

Jose Rodriguez-Ramos, Jesus Fuensalida

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269088

KEYWORDS: Segmented mirrors, Telescopes, Sensors, Image segmentation, Wavefronts, Atmospheric turbulence, Numerical simulations, Image restoration, Space telescopes, Point spread functions

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