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This half-day symposium celebrates Carlomagno's long career as a scientist, featuring a small but very distinguished selection of friends who shared interest with Giovanni along his way.

The symposium is scheduled in the morning of 11 June 2012.

Recent developments in time-resolved stimulated thermography - A review
Daniel L. Balageas
TREFLE Dept. of the Mechanics and Engineering Institute Univ. Bordeaux, France.

NDE with modulated thermography methods
Gerhard Busse
Institute of Polymer Technology, Non-Destructive Testing, University Stuttgart, Germany

Hyperspectral imagery for detection of water bodies state of health in the infrared region
Antonio Cenedese
Department of Civil Engineering, Building and Environment, Sapienza University of Rome, Italy

Dynamics of Free-Falling Liquid Sheet
Luigi de Luca
Dept. of Aerospace Engineering DIAS, University of Naples Federico II, Italy

Flow visualisation: Why does it support the understanding of fluid flow processes?
Wolfgang Merzkirch
Universitaet Duisburg-Essen, Germany

Recent developments in time-resolved stimulated thermography - A review Daniel L. Balageas, Professor TREFLE Dept. of the Mechanics and Engineering Institute Univ. Bordeaux, France. The last fifteen years have seen parallel important developments in both frequency-resolved and time-resolved stimulated thermographic techniques: the birth and development of respectively the pulse-phase thermography and of the Thermographic Signal Reconstruction method. The more recent period if characterized by new developments in the field of time resolved techniques (mainly pulse- and step-heating): Re-discovery of the interest of early detection for both better quantitative identification of defect and sharpness improvement of thermographic images; Attenuation of 3-D effects in defect identification; Renewed interest in the use of the effusivity concept for establishing a thermal tomography; Use of the concept of possibly negative thermal resistances for defect thermal resistance identification and solving the problem of sound zone definition. The present paper aims at presenting these recent advances in time-resolved thermography including new and unpublished results while putting them into perspective in the frame of three decades of works in the domain. Curriculum Vitae: Daniel Balageas received his diploma of Engineer in heat transfer and fluid mechanics from the Engineering School of Poitiers ENSMA (France) in 1964 and its habilitation or accreditation to supervise research from the University of Nantes (France) in 1991. He has more than 45 years of experience in aerospace research, essentially achieved at ONERA, the French Aerospace Lab, from 1965 to 2011 where he was appointed as adviser emeritus in 2005. He is presently associate researcher at the CNRS TREFLE Lab of the Institute of Mechanics of Bordeaux. He has been active in various fields such as : atmospheric re-entry thermal problems, ablation phenomena, rain and ice erosion of materials for radomes, irdomes and thermal heat shields, thermophysical properties measurements including in-vivo measurements, wind tunnel and in-flight instrumentation, non destructive testing and structural health monitoring. He is particularly active in infrared thermography since the mid 80's. In 1992 he created with Giovanni Carlomagno and Gerd Busse the Quantitative InfraRed Thermography Conference. In 2002, he created the European Workshop on Structural Health Monitoring, and finaly in 2004 the QIRT Journal. back to lecture list
NDE with modulated thermography methods Gerhard Busse, Professor Institute of Polymer Technology, Non-Destructive Testing, University Stuttgart, Germany The technique suggested by G. Carlomagno in 1976 is based on periodical heat deposition driving a thermal wave into the inspected solid. Reflections at thermal boundaries back to the surface are superposed there to the initial temperature modulation and cause a phase shift revealing the hidden boundary. Local phase of surface temperature modulation is retrieved by pixelwise Fourier transformation of the stack of thermographic images taken continuously of the object. This "Lockin Thermography" is useful in NDE since it allows to image subsurface features. Typical applications are remote inspection of fibre reinforced aerospace components where areas of cracks, delamination, or impact are imaged within typically less than a minute per square metre. Thermal waves can be generated by absorption of intensity modulated radiation (e.g. optical, eddy current or elastic waves. The latter technique allows for defect-selective imaging of areas with an enhanced mechanical loss angle, e.g. cracks or disbonds. Curriculum Vitae: Date and place of birth: June 13 th, 1943 in Olpe/Germany Education: Diploma and Ph.D. in Physics, University Freiburg/Germany (1969 and 1972). Positions: 1981 Visiting research professor, Emory University, Atlanta/GA, USA 1989 Associate Professor for NDE, University of Stuttgart, Germany (member of 2 faculties: Aerospace and Mechanical Engineering) Courses delivered: Applied Optics, methods of NDE, advanced measurement techniques, ceramic and fibre reinforced materials. Fields of scientific interest: Solid state physics and applied optics, material science, development and application of NDE methods. He has published about 400 publications on solid state physics, spectroscopy, lasers, infrared, acoustics, interferometry, vibrometry, NDE. back to lecture list
Hyperspectral imagery for detection of water bodies state of health in the infrared region Antonio Cenedese, Professor Department of Civil Engineering, Building and Environment, Sapienza University of Rome, Italy Monitoring techniques in remote and proximal sensing are assuming an increasingly important role in the field of environmental characterization. They can be used to study the state of the environment and track changes that occur over time. This technology has been particularly successful in monitoring bodies of water of all sizes from ponds to oceans and brooks to rivers. The main advantage of using hyperspectral sensing instead of traditional monitoring methods based on water sample collection is its good spatial and temporal coverage. Detection of water quality variables with remote sensing instruments is based on analysing the spectral features of solar radiation reflected from the water body. The substances found in natural waters (phytoplankton, suspended inorganic material, and dissolved organic matter) scatter and adsorb the incoming solar radiation. These processes are wavelength dependent, influencing the shape and the magnitude of the spectra reflected from water. Measurements have been conducted using two innovative experimental devices for acquiring hyperspectral images in the visible and infrared regions. The two devices are complementary; one is based on the use of interference filters, the other on the use of spectrometers. The systems developed have several unique and qualifying characteristics: low cost compared to other systems available on the market; high spectral resolution; high spatial and temporal resolution; portability i.e., the system has been engineered to be transported on ultra-light airplanes. Curriculum Vitae: Antonio Cenedese received his master's degree in Mechanical Engineering in 1966 and in Aerospace Engineering in 1969 from Sapienza University of Rome. His main research interests are developing optical experimental techniques (Laser Doppler Anemometry and Image Analysis), laboratory and numerical investigation of the atmospheric boundary layer, hyperspectral imaging and bio fluid mechanics. He has published more than 250 articles in well-recognized journals, books and proceedings on the subjects: atmospheric convective boundary layer; sea and land breezes; anabatic and katabatic winds; dispersion in porous media; oceanic currents; anomalous and standard diffusion; flows in proximity of cardiac valves; two-dimensional turbulence in geophysical flows; analysis of hyperspectral images, fluid-dynamic fields in ultracentrifuges; flows in the wake of wing profiles and screws; hydraulic distribution systems; grid-generated turbulence; transition to chaos of oscillating flows; visualization techniques based on Lagrangian description of motions; turbulent boundary layer; axial, transversal and buoyant jets.   back to lecture list
Dynamics of Free-Falling Liquid Sheet Luigi de Luca, Professor Dept. of Aerospace Engineering DIAS, University of Naples Federico II, Italy The physical mechanisms leading to the disintegration of a gravitational (non parallel) two-dimensional plane liquid curtain (sheet), occurring at low fluid flow rates, are not yet fully known. The problem is reconsidered here through the development of an unsteady inviscid mathematical model where the dependent variables are expressed by means of polynomial expansions in terms of powers of the local lateral distance from the centerline position. Surface tension effects are included, and the ambient pressure field may be either applied or induced by the compliant free interface. The linearization around the base flow allows the separation of sinuous and varicose responses. The global linear stability of such a model is analyzed by inspecting both modal and non-modal amplifications of disturbances energy. An equation of energy budget is also derived, which is used to estimate the contribution of the various physical effects evaluated via direct numerical simulations of the governing system of equations. Curriculum Vitae: Born in Naples, Italy, 11 October 1952. Graduated in Aeronautical Engineering 30 June 1977 summa cum laude, at University of Naples Federico II. Full Professor of Fluid-Dynamics at University of Naples (2000-present). Main Scientific and technical interests: Numerical methods in Fluid dynamics: Simulation of the injection system of high speed Diesel engines; Free-surface flows simulation; Boundary layer control by means of synthetic jets; Numerical simulation of two-phase flows (flash evaporation phenomenon). Experimental methods in Gasdynamics: Fluid dynamics applications of the Thermography (measurements of heat transfer to impinging jets; non-intrusive diagnostics of subsonic boundary layer; aerodynamic heating measurements and visualization of hypersonic flows in hypersonic wind tunnels; study of Goertler vortices in hypersonic flow). Theoretical fluid dynamics: Modern analyses of fluid dynamics instabilities (absolute/convective instability, non-modal instability due to the non-normality of the governing operator); Instability of liquid sheets under gravity; Investigation of the flutter instability (fluid-structure interactions) in the framework of the non-modal analysis. He is author/co-author of more than 150 scientific papers in international journals and conferences.  back to lecture list
Flow visualisation: Why does it support the understanding of fluid flow processes? Wolfgang Merzkirch, Professor Emeritus Universitaet Duisburg-Essen, Germany The methods of flow visualisation serve for visualising the motion of fluids that are normally transparent and invisible for the naked eye. Following a postulation of Hermann von Helmholtz, visual perception of the processes under study supports the understanding of the seen or recorded phenomena, here: developing a physical model of the flow processes. This postulation requires a link between eye and brain where sufficient knowledge from the past must be stored in order to interpret the visible information. Among all possible sensations seeing is the most significant source for “constructing a picture of the world” (Ernst Mach). Therefore, quantitative data for physical processes, generated by measurements or calculations, are most frequently displayed in visible form in order to facilitate the understanding of their meaning. A flow picture includes an abundance of quantitative data, and a number of fundamental flow phenomena, that were unknown before, have been discovered by appropriate visualisation, e.g. the existence of supersonic flow, or the formation of coherent structures in turbulent flow. Curriculum Vitae: Wolfgang Merzkirch is Professor Emeritus of Fluid Mechanics at Universitaet Duisburg-Essen, Germany. His main field of interest is experimental fluid mechanics, and here particularly optical measurement techniques, flow visualisation, and also fluid mechanical aspects of flow metering. He held visiting professorships in Roma ("La Sapienza"), Texas (Texas A&M), Madras (Indian Institute of Technology). He is author of the books "Flow Visualization" (Academic Press 1974 and 1983), "Fluid Mechanics of Flow Metering" (Springer Verlag 2005), founding editor of the journal "Experiments in Fluids" (Springer-Verlag), editor of the book series "Experimental Fluid Mechanics" (Springer-Verlag), and he was chairman of the Second International Symposium on Flow Visualization (Bochum, Germany, 1980). Wolfgang Merzkirch was awarded the Leonardo da Vinci Award (8th International Symposium on Flow Visualization, Sorrento, 1998), the Asanuma Award (Japan Society of Visualization, 2000), and he presented the Ludwig Prandtl Memorial Lecture 2002 (Annual Meeting of GAMM, Padova).   back to lecture list

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