Prof. Ferran Laguarta Profile

Prof. Ferran Laguarta

at Univ Politècnica de Catalunya

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 26 June 2017 Paper

Automated stent defect detection and classification with a high numerical aperture optical system

Carlos Bermudez, Ferran Laguarta, Cristina Cadevall, Aitor Matilla, Sergi Ibañez, Roger Artigas

Proceedings Volume 10334, 103340C (2017) https://doi.org/10.1117/12.2275614

KEYWORDS: Line scan image sensors, Cameras, Binary data, Objectives, Optical inspection, Defect detection, Inspection, Image classification, Visualization, Microscopy, Image visualization, Process control

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Proceedings Article | 20 February 2017 Paper

Optical stent inspection of surface texture and coating thickness

Carlos Bermudez, Ferran Laguarta, Cristina Cadevall, Aitor Matilla, Sergi Ibañez, Roger Artigas

Proceedings Volume 10110, 1011007 (2017) https://doi.org/10.1117/12.2249614

KEYWORDS: Inspection, Coating, Optical inspection, 3D metrology, Reflectance spectroscopy, Microscopy, Metrology, 3D image processing, Cameras, Confocal microscopy, Interfaces, Microscopes, Interferometry, Objectives

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Proceedings Article | 22 September 2011 Paper

Non-contact measurement of aspherical and freeform optics with a new confocal tracking profiler

Agustí Pintó, Ferran Laguarta, Roger Artigas, Cristina Cadevall

Proceedings Volume 8169, 81690V (2011) https://doi.org/10.1117/12.896724

KEYWORDS: Confocal microscopy, Freeform optics, Aspheric lenses, Metrology, Calibration, Sensors, Spherical lenses, Optics manufacturing, 3D metrology, Error analysis

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Proceedings Article | 18 June 2007 Paper

Improving the measurement of thick and thin films with optical profiling techniques

Cristina Cadevall, Carles Oriach-Font, Roger Artigas, Agustí Pintó, Ferran Laguarta

Proceedings Volume 6616, 66161Z (2007) https://doi.org/10.1117/12.726187

KEYWORDS: Confocal microscopy, Semiconducting wafers, Thin films, Silicon, Objectives, Interfaces, Refractive index, Blue light emitting diodes, Light sources, Profiling

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Proceedings Article | 10 September 2004 Paper

Dual-technology optical sensor head for 3D surface shape measurements on the micro- and nanoscales

Roger Artigas, Ferran Laguarta, Cristina Cadevall

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.545701

KEYWORDS: Confocal microscopy, Interferometers, Objectives, Head, 3D metrology, Profiling, Sensors, Microscopes, Inspection, Standards development

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Proceedings Article | 10 September 2004 Paper

3D shape measurement of nozzles on the micrometric scale

Ferran Laguarta, Roger Artigas, Cristina Cadevall

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.545673

KEYWORDS: 3D metrology, Charge-coupled devices, Confocal microscopy, Printing, Excimer lasers, Surface finishing, Objectives, Backscatter, Profiling, Polymers

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Proceedings Article | 30 May 2003 Paper

Development of confocal-based techniques for shape measurements on structured surfaces containing dissimilar materials

Cristina Cadevall, Roger Artigas, Ferran Laguarta

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500470

KEYWORDS: Confocal microscopy, Silicon, Objectives, Interfaces, Refraction, Photoresist materials, Microscopes, Reflection, Wavefronts, Distance measurement

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Proceedings Article | 24 October 2000 Paper

Design of an interferometric system for piston measurements in segmented primary mirrors

Josep Arasa, Ferran Laguarta, Carlos Pizarro, Nuria Tomas, Agusti Pinto

Proceedings Volume 4093, (2000) https://doi.org/10.1117/12.405231

KEYWORDS: Mirrors, Image segmentation, Wavefronts, Interfaces, Interferometers, Light sources, Interferometry, Imaging systems, Optical testing, Beam splitters

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Recently, telescopes with segmented primary mirrors are becoming increasingly popular due to their ability of achieving large apertures without the inconveniences caused by the fabrication and handling of monolithic surfaces with 8m (or over) in diameter. The difference in position of each pair of adjacent segments along the local normal of their interface (called piston hereafter), however, needs to be precisely measured in order to provide a diffraction- limited image. If a system yielding the nanometric accuracy required in piston measurements worked in daylight hours, the resultant saving in observation time would be an important advance on a majority of the state-of-the-art piston measurement systems. An interferometric piston measurement instrument accomplishing such objectives has been designed starting from the usual Michelson configuration at the CD6 (Terrassa, Spain), and its final test has been carried out in the test workbench of the Instituto de Astrofisica de Canarias (IAC, Canary Islands, Spain). Its optical layout relies on projecting the reference arm of the interferometer onto one of the segments of the pair considered, along the direction of the local normal to the surface while the measurement arm is projected onto the interface which divides the pair of segments considered. The field of view and its illumination are calculated to be equivalent in both segments. The lateral shift of the fringes in both interferograms determines the piston error present. A combination of monochromatic and white light is used, in order to remove the (lambda) /2 phase ambiguities present in piston measurements without losing the required resolution in the measurement. In this paper, the optical design of this interferometric piston measurement instrument will be presented. The particular configuration used in the interferometer, the implementation of an imaging system allowing to see both the interface of the segments and the interference fringes, the effect of the extension of the source and the use of both monochromatic and whit light will be discussed. A detailed study of the wavefront errors embedded in the wavefront at different stages of the interferometer is performed. The analysis shows the validity of the design of the instrument, and some experimental results obtained at the test workbench are provided to demonstrate the ability of the instrument to perform nanometric piston measurements under daylight conditions.

Proceedings Article | 21 September 1999 Paper

Three-dimensional micromeasurements on smooth and rough surfaces with a new confocal optical profiler

Roger Artigas, Agusti Pinto, Ferran Laguarta

Proceedings Volume 3824, (1999) https://doi.org/10.1117/12.364243

KEYWORDS: Confocal microscopy, Microscopes, Objectives, Charge-coupled devices, Time metrology, Metrology, Computing systems, Mirrors, Helium neon lasers, 3D image processing

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Proceedings Article | 20 September 1999 Paper

Surface dynamics during laser polishing of glass

Fidel Vega, Jesus Armengol Cebrian, Nuria Lupon, Ferran Laguarta

Proceedings Volume 3822, (1999) https://doi.org/10.1117/12.364216

KEYWORDS: Surface finishing, Glasses, Polishing, Mirrors, Laser therapeutics, Laser processing, Waveguides, Transducers, Laser glasses, Temperature metrology

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Proceedings Article | 29 December 1998 Paper

Micromeasurements on smooth surfaces with a new confocal optical profiler

Ferran Laguarta, Roger Artigas, Agusti Pinto, I. Al-Khatib

Proceedings Volume 3520, (1998) https://doi.org/10.1117/12.334329

KEYWORDS: Objectives, Confocal microscopy, Microscopes, Charge-coupled devices, Prototyping, Diamond, Image processing, Mirrors, Computing systems, Metrology

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SPIE Journal Paper | 1 January 1998

Laser application for optical glass polishing

Fidel Vega, Nuria Lupon, Jesus Armengol Cebrian, Ferran Laguarta

OE, Vol. 37, Issue 01, (January 1998) https://doi.org/10.1117/12.10.1117/1.601614

KEYWORDS: Glasses, Surface finishing, Polishing, Sensors, Laser applications, Laser therapeutics, Laser irradiation, Gas lasers, Carbon monoxide, Laser processing

Proceedings Article | 17 September 1997 Paper

Optical metrology of difficult-to-access surfaces: micromeasurement of the inner profiles of diamond wiring dies

Ferran Laguarta, I. Al-Khatib, Cristina Cadevall, Jesus Caum

Proceedings Volume 3098, (1997) https://doi.org/10.1117/12.281201

KEYWORDS: Diamond, Prototyping, Confocal microscopy, Charge-coupled devices, Objectives, Microscopes, Metrology, Computing systems, Image processing, Manufacturing

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Proceedings Article | 23 September 1996 Paper

Active beam integrator for high-power coherent lasers

Ferran Laguarta, Jesus Armengol Cebrian, Fidel Vega, Nuria Lupon

Proceedings Volume 2789, (1996) https://doi.org/10.1117/12.251174

KEYWORDS: Mirrors, High power lasers, Beam shaping, Visibility, Heat treatments, Carbon dioxide lasers, Imaging systems, Superposition, Spatial coherence, Diffraction

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Proceedings Article | 19 August 1996 Paper

Laser application for optical glass polishing

Ferran Laguarta, Nuria Lupon, Fidel Vega, Jesus Armengol

Proceedings Volume 2775, (1996) https://doi.org/10.1117/12.246797

KEYWORDS: Surface finishing, Glasses, Polishing, Sensors, Carbon dioxide lasers, Laser therapeutics, Laser processing, Temperature metrology, High power lasers, Mirrors

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Showing 5 of 15 publications

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