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Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Vargas, Javier ; Gómez Pedrero, José Antonio | Spie-Soc Photo-Optical Instrumentation Engineers | 2006-10We present a high-speed 3-D spatiotemporal shape measurement technique by means of structured light. Current methods use a constant number of images that do not take into account the available temporal continuity of the measured object. That is,[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Fournier, N. ; Martínez Antón, Juan Carlos | VDI-VDE - Verlag GMBH | 2004Automatic demodulation of single-image fringe patterns is of great importance in research areas were it is difficult to apply standard phase evaluation techniques such as phase sampling or Fourier transform methods. In this work we will present [...]texto impreso
Quiroga Mellado, Juan Antonio ; Villa Hernández, José de Jesús ; Crespo Vázquez, Daniel | SPIE--The International Society for Optical Engineering | 1999In this work we present two methods for the analysis of moire deflectograms. The first method is a Fourier-transform technique. The second method uses a regularization based method. Both methods are applied to realistic deflectograms and their p[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Gómez Pedrero, José Antonio | The Optical Society Of America | 2010-06-10In many fringe pattern processing applications the local phase has to be obtained from a sinusoidal irradiance signal with unknown local frequency. This process is called asynchronous phase demodulation. Existing algorithms for asynchronous phas[...]texto impreso
Quiroga Mellado, Juan Antonio ; Servín Guirado, Manuel ; Marroquín Zaleta, José Luis ; Crespo Vázquez, Daniel | Optical Society of America | 2005-03The spatial orientation of the fringe has been demonstrated to be a key point in the reliable phase demodulation from a single n-dimensional fringe pattern regardless of the frequency spectrum of the signal. The recently introduced general n-dim[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-03-01The term generalized grating imaging is used to describe the process of image formation of a grating using only another grating as imaging system. The moiré and the Lau effects could be regarded as particular cases of such a process. Here we dea[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Gómez Pedrero, José Antonio | The Optical Society Of America | 2004-11-20The spatial orientation of fringes has been demonstrated to be a key point in reliable phase demodulation from a single n-dimensional fringe pattern, regardless of the frequency spectrum of the signal. Recent publications have shown a general me[...]texto impreso
Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Crespo Vázquez, Daniel | SPIE--The International Society for Optical Engineering | 2007Phase detection is an important issue when dealing with optical metrology techniques for which the magnitude to be measured is encoded through the phase of a given fringe pattern. Asynchronous phase detection techniques are employed when the rat[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 1999-06In this work, a Fourier transform technique for automatic analysis of moire deflectograms is presented. A squared grating is used to multiplex the information of the deflection in two orthogonal directions in one image. This procedure avoids the[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2000-07It is a well-known fact that one grating can act as an imaging element for another grating when the first is illuminated with an extended monochromatic light source. The conditions for image formation in such a system are studied when the finite[...]texto impreso
Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Terrón López, M. José ; Crespo Vázquez, Daniel | Elsevier Sci. Ltd. | 2006-12In this paper we present the application of a direct demodulation method for the measurement of surface topography by means of Shadow-Moiré. In our set-up, we use three LEDs (with green, red and blue peak wavelengths) to illuminate the grating. [...]texto impreso
Quiroga Mellado, Juan Antonio ; Vázquez Moliní, Daniel ; Crespo Vázquez, Daniel | Spie-Society of Photo-Optical Instrumentation Engineers | 2006-02A new method for 3-D shape registration of prismatic objects is presented. The term prismatic object denotes any object with sharp boundaries on its surface. These kinds of objects cannot be correctly registered with typical existing methods, wh[...]texto impreso
Alonso Fernández, José ; Crespo Vázquez, Daniel ; Jiménez Castillo, Isidoro ; Bernabeu Martínez, Eusebio | SPIE--The International Society for Optical Engineering | 2005An all optical autofocus has been designed and tested for tight line width control in a high NA laser photoplotter system. The laser system is based in a GaN semiconductor laser with power 30 mW and wavelength 405 nm. The advantage of using this[...]texto impreso
Morlanes Calvo, Tomás ; Peña, José Luis de la ; Sánchez Brea, Luis Miguel ; Alonso Fernández, José ; Crespo Vázquez, Daniel ; Saez Landete, José ; Bernabeu Martínez, Eusebio | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2005In this work, an optoelectronic device that provides the absolute position of a measurement element with respect to a pattern scale upon switch-on is presented. That means that there is not a need to perform any kind of transversal displacement [...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2000-08-01Reflection optical encoders are studied as three-grating moiré systems. An analysis is made of the differences that may appear between it and the standard case in which an optical encoder is regarded as a two-grating system.
