Person:
Quiroga Mellado, Juan Antonio

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First Name
Juan Antonio
Last Name
Quiroga Mellado
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Óptica
Area
Optica
Identifiers
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Search Results

Now showing 1 - 4 of 4
  • Publication
    Fourier transform method for automatic processing of moiré deflectograms
    (Spie-Soc Photo-Optical Instrumentation Engineers, 1999-06) Quiroga Mellado, Juan Antonio; Crespo Vázquez, Daniel; Bernabeu Martínez, Eusebio
    In 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 necessity of rotating the gratings to obtain the complete deflection information. With this method only two fringe patterns. reference and distorted, are needed to determine the complete deflection information. To deal with irregularly shaped processing areas, a Gerchberg extrapolation method is used. The automatic determination of the carrier as well as the size and position of the reconstruction windows permit the complete and automatic measurement of the deflection produced by an ophthalmic lens in two orthogonal directions. Afterwards, the refractive power maps can be obtained, Experimental results obtained with a progressive addition lens are presented and comparison with measurements obtained with a commercial focimeter are shown showing a good agreement.
  • Publication
    On the dependence on isoclinics of the modulation of isochromatic phase maps
    (Gustav Fischer Verlag, 1999) Quiroga Mellado, Juan Antonio; González Cano, Agustín
    In this work we evaluate the dependence on isoclinics of the modulation of the isochromatic phase maps when phase-shifting algorithms are applied to experiments of photoelasticity. This dependence makes conventional phase-shifting algorithms unsuitable for that application.
  • Publication
    Automatic techniques for evaluation of moire deflectograms
    (SPIE--The International Society for Optical Engineering, 1999) Quiroga Mellado, Juan Antonio; Villa Hernández, José de Jesús; Crespo Vázquez, Daniel
    In 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 performances are discussed.
  • Publication
    Application of regularization methods to the analysis of photoelastic fringe patterns
    (SPIE--The International Society for Optical Engineering, 1999) Quiroga Mellado, Juan Antonio; González Cano, Agustín
    In this work we present the application of a regularization algorithm to the processing of photoelastic hinge patterns. The method used is a modified phase tracking algorithm applied to phase-shifted images. In particular, we present an algorithm for isoclinics-isochromatics separation that uses only five images. The performance of the method is discussed and experimental results are presented.