The discovery of the laser has stimulated the development of different techniques that have produced a revolution in the fields of optical metrology and experimental mechanics. At present times, coherent optics techniques have become one of the most accurate methodologies for solving different problems in the fields of experimental mechanics, non-destructive testing and materials science. Some of these advances are also focused on the development of methods to automate data processing and also to make easier their application outside of the laboratory.
Most of the techniques used at the Optical Metrology Laboratory are based on the application of the speckle phenomenon, which is the granularity appearing on a rough surface when it is illuminated by a laser. When this phenomenon is used to measure mechanical deformations, the resulting techniques have the advantage of enabling the visualization of interference fringes on a video monitor without need to use any photographic process, which makes it possible to make real time measurements. In addition, the testing material can be of any kind and it does not need to have special optical properties. Finally, measurements can be made without being in contact with the object and results are obtained on the whole surface of the object, and not only on certain points as when strain gages are used. A list of some of the research projects undertaken during the last three years appears below. For more details, please see the articles listed under Publications.

Group Members

• Dr. Guillermo H. Kaufmann
  Researcher of CONICET – Head of the group
  kaufmann@ifir.edu.ar - Página personal
• Dr. Gustavo E. Galizzi
  Researcher of CONICET
  galizzi@ifir.edu.ar
• Lic. María B. Bernini
  Doctoral student supported by a CONICET fellowship
  mbernini@ifir.edu.ar
• Lic. Andrés E. Dolinko
  Doctoral student supported by a ANPCyT fellowship
  dolinko@ifir.edu.ar
• Ing. Fernando A. Marengo Rodriguez
  Doctoral student supported by a ANPCyT fellowship
  fmarengo@ifir.edu.ar

Projects

Dynamic speckle interferometry system for analysing non-repetitive transient phenomena based on a continuous laser and a high-speed video camera.
	System for evaluating residual stresses in mechanical components by measuring the local deformation field generated by the introduction of a small hole and by the application of digital speckle pattern interferometry.
Internal flaw detection by using dynamic speckle interferometry and thermal waves.
	Speckle noise removal on digital speckle pattern interferometry fringes by using a wavelet transform method.

Publications

2006

• M. R. Viotti, G. H. Kaufmann and G. E. Galizzi, Measurement of elastic moduli using spherical indentation and digital speckle pattern interferometry with automated data processing, Optics and Lasers in Engineering 44, 495-508 (2006).
• A. Federico, G. H. Kaufmann, G. E. Galizzi, H. Rabal, M. Trivi and R. Arizaga, Simulation of dynamic speckle sequences and its application to the analysis of transient processes, Optics Communications 260, 493-499 (2006).
• A. Federico and G. H. Kaufmann, Phase retrieval in digital speckle pattern interferometry by application of two-dimensional active contours called snakes, Applied Optics 45, 1909-1916 (2006).
• M. R. Viotti, A. Dolinko, G. E. Galizzi and G. H. Kaufmann, A portable digital speckle pattern interferometry device to measure residual stresses using the hole drilling technique, Optics and Lasers in Engineering 44, 1052-1066 (2006).
• A. E. Dolinko and G. H. Kaufmann, A least squares method to cancel rigid body displacements in a hole drilling and DSPI system for measuring residual stresses, Optics and Lasers in Enginering 44, 1336-1347 (2006).
• H. Rabal, M. Trivi, R. Arizaga, A. Federico, G. E. Galizzi and G. H. Kaufmann, A numerical model for dynamic speckle and its application to the analysis of temporally evolving processes, Proceedings of the International Society for Optical Engineering 6341, 63411G-1 63411G-6 (2006).
• A. Federico and G. H. Kaufmann, Multifractals and dynamic speckle, Proceedings of the International Society for Optical Engineering 6341, 63412J-1 63412J-6 (2006).
• A. Federico and G. H. Kaufmann, Evaluation of dynamic speckle activity using the empirical mode decomposition method, Optics Communications 267, 287-294 (2006).
• H. Rabal, N. Cap, M. Trivi, R. Arizaga, A. Federico, G. E. Galizzi and G. H. Kaufmann, Speckle activity images based in the spatial variance of the phase, Applied Optics 45, 8733-8738 (2006).
• M. B. Bernini, G. E. Galizzi, A. Federico and G. H. Kaufmann, Evaluation of the 1D Empirical Mode Decomposition method to smooth Digital Speckle Pattern Interferometry fringes, Optics and Lasers in Engineering (in press).
• A. E. Dolinko and G. H. Kaufmann, Enhancement in flaw detectability by means of lockin temporal speckle pattern interferometry and thermal waves, Optics and Lasers in Engineering (in press).
• A. Federico and G. H. Kaufmann, Multiscale analysis in dynamic speckle, Applied Optics (in press).

2005

• M. R. Viotti , A Albertazzi Jr. and G. H. Kaufmann, Measurement of residual stresses using a radial in-plane digital speckle pattern interferometer and local heating. Recent advances, Proceedings of the International Society for Optical Engineering 5776, 709-716 (2005).
• A. Federico and G. H. Kaufmann, Local denoising of digital speckle pattern interferometry fringes using multiplicative correlation and weighted smoothing splines, Applied Optics 44, 2728-2735 (2005).
• A. Davila, J. M. Huntley, G. H. Kaufmann and D. Kerr, High speed dynamic speckle interferometry: phase errors due to intensity, velocity and speckle decorrelation, Applied Optics 44, 3954-3962 (2005).
• M. R. Viotti, A. Albertazzi Jr. and G. H. Kaufmann, Measurement of residual stresses using local heating and a radial in-plane speckle interferometer, Optical Engineering 44, 093606 (2005).
• A. Federico and G. H. Kaufmann, Application of weighted smoothing splines to the local denoising of digital speckle pattern interferometry fringes, Fringe 2005, W. Osten, editor, Springer, Berlin, 208-211 (2005).

2004

• M. R. Viotti and G. H. Kaufmann, Accuracy and sensitivity of a hole drilling and digital speckle pattern interferometry combined technique to measure residual stresses, Optics and Lasers in Engineering 41, 297-305 (2004).
• F. V. Díaz, A. F. Armas, G. H. Kaufmann and G. E. Galizzi, Nondestructive evaluation of the fatigue damage accumulation process around a notch using a digital image measurement system, Optics and Lasers in Engineering 41, 477-487 (2004).
• M. R. Viotti, R. Sutério, A. Albertazzi Jr. and G. H. Kaufmann, Residual stress measurement using a radial in-plane speckle interferometer and laser annealing: preliminary results, Optics and Lasers in Engineering 42, 71-84 (2004).
• F. V. Díaz, A. F. Armas, G. H. Kaufmann and G. E. Galizzi, Fatigue damage accumulation around a notch using a digital image measurement system, Experimental Mechanics 44, 241-246 (2004).
• A. Federico and G. H. Kaufmann, Retrieval of phase derivative discontinuities in digital speckle pattern interferometry fringes using the Wigner-Ville distribution, Proceedings of the International Society for Optical Engineering 5531, 127-133 (2004).
• G. H. Kaufmann, M. R. Viotti and G. E. Galizzi, Application of thermal waves to flaw detection using temporal speckle pattern interferometry, Proceedings of the International Society for Optical Engineering 5532, 300-307 (2004).
• A. Federico and G. H. Kaufmann, Phase measurement in digital speckle pattern interferometry using wavelet transforms: recent developments, Proceedings of the International Society for Optical Engineering 5622, 568-573 (2004).
• M. R. Viotti, G. H. Kaufmann, E. A. Fancello, A. Gastón and O. Möller, Determination of residual stresses by means of a digital speckle pattern interferometry and a local heating combined technique, Proceedings of the International Society for Optical Engineering 5622, 574-579 (2004).
• G. H. Kaufmann, M. R. Viotti and G. E. Galizzi, Flaw detection improvement in temporal speckle pattern interferometry using thermal waves, Journal of Holography and Speckle 1, 80-84 (2004).

2003

• P. D. Ruiz, J. M. Huntley and G. H. Kaufmann, New adaptive phase-shifting algorithm for temporal phase evaluation, Journal of the Optical Society of America A 20, 325-332 (2003).
• G. H. Kaufmann, Phase measurement in temporal speckle pattern interferometry using the Fourier transform method with and without a temporal carrier, Optics Communications 217, 141-149 (2003).
• A. Davila, P. D. Ruiz, G. H. Kaufmann and J. M. Huntley, Measurement of sub-surface delaminations in carbon fibre composites using high-speed phase-shifted speckle interferometry and temporal phase unwrapping, Optics and Lasers in Engineering 40, 447-458 (2003).
• A. Federico and G. H. Kaufmann, Phase retrieval in digital speckle pattern interferometry using a chirped gaussian wavelet transform and a smoothed time-frequency distribution, Proceedings of the International Society for Optical Engineering 4933, 200-205 (2003).
• P. D. Ruiz, J. M. Huntley and G. H. Kaufmann, Recent advances on temporal phase-shifting speckle interferometry, Proceedings of the International Society for Optical Engineering 4933, 297-304 (2003).
• M. R. Viotti, R. Suterio, A. Albertazzi Jr. and G. H. Kaufmann, Residual stress measurement using a radial in-plane speckle interferometer and laser annealing, Proceedings of the International Society for Optical Engineering 5144, 571-577 (2003).
• G. H. Kaufmann, Nondestructive testing with thermal waves using phase shifted temporal speckle pattern interferometry, Optical Engineering 42, 2010-2014 (2003).
• A. Federico and G. H. Kaufmann, Phase retrieval in digital speckle pattern interferometry using a smoothed time-frequency distribution, Applied Optics 35, 7060-7065 (2003).

2002

• F. V. Díaz, G. H. Kaufmann, A. F. Armas and O. Möller, Near-tip displacement field measurement in a fatigue damaged steel plate by digital speckle pattern interferometry, Optics and Lasers in Engineering 37, 621-629 (2002).
• P. D. Ruiz, G. H. Kaufmann and J. M. Huntley, New adaptive phase-shifting algorithms for temporal phase evaluation, Proceedings of SPIE 4777, 251-258 (2002).
• A. Federico and G. H. Kaufmann, Evaluation of the continuous wavelet transform method for phase measurement in Digital Speckle Pattern Interferometry, Proceedings of SPIE 4777, 279-287 (2002).
• P. D. Ruiz, J. M. Huntley, Y. Shen, C. R. Coggrave and G. H. Kaufmann, Effects of random vibration in high-speed phase-shifting speckle pattern interferometry, Applied Optics 41, 3941-3949 (2002).
• P. D. Ruiz, G. H. Kaufmann and J. M. Huntley, Temporal phase evaluation using novel adaptive phase-shifting algorithms, Proceedings of the XIX Congress of the International Commission for Optics, 877-878 (2002).
• A. Davila, J. M. Huntley and G. H. Kaufmann, Temporal phase unwrapping: analysis of intensity, velocity and speckle decorrelation errors, Proceedings of the XIX Congress of the International Commission for Optics, 887-888 (2002).
• G. H. Kaufmann and G. E. Galizzi, Phase measurement in temporal speckle pattern interferometry: comparison between the phase-shifting and the Fourier transform methods, Applied Optics 41, 7254-7263 (2002).
• A. Federico and G. H. Kaufmann, Evaluation of the continuous wavelet transform method for phase extraction in Electronic Speckle Pattern Interferometry, Optical Engineering 41, 3209-3216 (2002).

2001

• P. D. Ruiz, G. H. Kaufmann, A. Davila, J. M. Huntley, Application of high-speed phase-shifted speckle interferometry to the detection of sub-surface delaminations in carbon fibre composites, Proceedings of SPIE 4419, 158-161 (2001).
• A. Federico and G. H. Kaufmann, Phase retrieval in electronic speckle pattern interferometry using the continuous wavelet transform, Proceedings SPIE 4419, 162-165 (2001).
• G. H. Kaufmann, P. D. Ruiz and G. E. Galizzi, Recent developments in double-pulsed video speckle interferometry and its application to the measurement of high-speed transient deformations, Proceedings of SPIE 4420, 139-148 (2001).
• P. D. Ruiz, J. M. Huntley, Y. Shen, C. R. Coggrave and G. H. Kaufmann, Low-frequency vibration measurement with high-speed phase-shifting speckle pattern interferometry and temporal phase unwrapping, Fringe 2001, W. Jüptner and W. Osten, editors, Elsevier, Paris, 247-252 (2001).
• P. D. Ruiz, J. M. Huntley, Y. Shen, C. R. Coggrave and G. H. Kaufmann, Rms phase error in low frequency vibration measurements with high-speed phase-shifting speckle pattern interferometry, Optical Engineering 40, 1984-1992 (2001).
• A. Federico and G. H. Kaufmann, Comparative study of wavelet thresholding methods for denoising Electronic Speckle Pattern Interferometry fringes, Optical Engineering 40, 2598-2604 (2001).
• F. V. Díaz, G. H. Kaufmann and O. Möller, Residual-stress determination using blind-hole drilling and digital speckle pattern interferometry with automated data processing, Experimental Mechanics 41, 319-323 (2001).
• P. D. Ruiz, A. Davila, G. Mendiola and G. H. Kaufmann, Measurement of the temporal evolution of periodic induced displacement derivatives using stroboscopic speckle-shearing interferometry, Optical Engineering 40, 318-324 (2001).
• P. D. Ruiz, J. M. Huntley, Y. Shen, C. R. Coggrave and G. H. Kaufmann, Vibration-induced phase errors in high-speed phase-shifting speckle pattern interferometry, Applied Optics 40, 2117-2125 (2001).
• F. V. Díaz, G. H. Kaufmann, A. F. Armas and G. E. Galizzi, Optical measurement of the plastic zone size in notched metal specimens subjected to low-cycle fatigue, Optics and Lasers in Engineering 35, 325-333 (2001).
• M. F. Salfity, G. H. Kaufmann, P. Granitto and H. A. Ceccatto, Automated detection and classification of clustered microcalcifications using morphological filtering and statistical techniques, Digital Mammography-Toronto-2000, Medical Physics Publishing, Madison, 253-258 (2001).

2000

• R. A. Martínez-Celorio, A. Davila, G. H. Kaufmann and G. Mendiola, Extension of the displacement measurement range for electronic speckle-shearing pattern interferometry using carrier fringes and a temporal phase unwrapping method, Optical Engineering 39, 751-757 (2000).
• P. D. Ruiz, G. H. Kaufmann, O. Möller and G. E. Galizzi, Evaluation of impact-induced transient deformations using double-pulsed electronic speckle pattern interferometry and finite elements, Optics and Lasers in Engineering 32, 473-484 (2000).
• A. Davila, G. H. Kaufmann and G. Mendiola Anda, Phase retrieval from electronic speckle-shearing pattern interferometry using an iterative method, Proceedings of the International Conference on Trends in Optical Nondestructive Testing, Lugano, Switzerland, 159-165 (2000).
• G. H. Kaufmann, P. D. Ruiz, O. Möller and G. E. Galizzi, Evaluation of transient deformations using ESPI and finite elements, Proceedings of the IX International Congress on Experimental Mechanics, Orlando, USA, 144-146 (2000).
• A. Fernández, A. F. Doval, G. H. Kaufmann, A. Davila, J. Blanco-García, C. Pérez-López and J. L. Fernández, Measurement of transient out-of-plane displacement gradients in plates using double-pulsed subtraction TV shearography, Optical Engineering 39, 2106-2113 (2000).
• F. V. Díaz, G. H. Kaufmann and G. E. Galizzi, Determination of residual stresses using hole drilling and digital speckle pattern interferometry with automated data analysis, Optics and Lasers in Engineering 33, 39-48 (2000).
• M. F. Salfity, G. H. Kaufmann, P. M. Granitto and H. A. Ceccatto, A computer-aided diagnosis method for automated detection and classification of clustered microcalcifications in mammograms, Proceedings of the Argentine Symposium on Healthcare Informatics, Tandil, 41-47 (2000).
• A. Federico, G. H. Kaufmann and E. P. Serrano, Speckle noise reduction in ESPI fringes using wavelet shrinkage, Proceedings of the Conference on Interferometry in Speckle Light: Theory and Applications, Springer, Berlin, 397-404 (2000).
• P. D. Ruiz, J. M. Huntley G. H. Kaufmann and D. Kerr, High speed phase-shifted speckle pattern interferometry for studying dynamic events, Interferometry in Speckle Light. Theory and Applications, Springer, Berlin, 473-480 (2000).