Numerical Modelling of Laser Cleaning and Conservation of Artworks

Marczak, J.; Jach, K.; Sarzyński, A.

doi:10.1007/3-540-27176-7_39

Cited by 5 publications

(2 citation statements)

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“…Numerical analysis that were carried out earlier [60-65], concerned quality results of determination of pulse laser beam influence on the behaviour of evaporated material. Developed physical model and computer software reveal high universality and correctly show the quality trends observed in all experiments.…”

Section: Exploitation Of the Results Conclusionmentioning

confidence: 99%

Characterization of Laser Cleaning of Artworks

Marczak

Koss

Targowski

et al. 2008

Sensors

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The main tasks of conservators of artworks and monuments are the estimation and analysis of damages (present condition), object conservation (cleaning process), and the protection of an object against further degradation. One of the physical methods that is becoming more and more popular for dirt removal is the laser cleaning method. This method is non-contact, selective, local, controlled, self-limiting, gives immediate feedback and preserves even the gentlest of relief - the trace of a paintbrush. Paper presents application of different, selected physical sensing methods to characterize condition of works of art as well as laser cleaning process itself. It includes, tested in our laboratories, optical surface measurements (e.g. colorimetry, scatterometry, interferometry), infrared thermography, optical coherent tomography and acoustic measurements for “on-line” evaluation of cleaning progress. Results of laser spectrometry analyses (LIBS, Raman) will illustrate identification and dating of objects superficial layers.

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Section: Exploitation Of the Results Conclusionmentioning

confidence: 99%

Characterization of Laser Cleaning of Artworks

Marczak

Koss

Targowski

et al. 2008

Sensors

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“…In order to understand and further improve the process parameters, different modelling approaches have been developed either analytically [5][6][7][8][9][10][11][12][13][14][15], or numerically [13,[16][17][18][19][20][21]. Conventional numerical modelling methods such as finite elements (FE), finite difference (FD) and finite volume (FV) may not be able to predict complex processes when multiple materials and phases are interacting due to the connected mesh that describes the computational domain.…”

Section: Introductionmentioning

confidence: 99%

Smoothed Particle Hydrodynamics (SPH) modelling of transient heat transfer in pulsed laser ablation of Al and associated free-surface problems

Alshaer

Rogers

2017

Computational Materials Science

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A smoothed particle hydrodynamics (SPH) numerical model is developed to simulate pulsed-laser ablation processes for micro-machining. Heat diffusion behaviour of a specimen under the action of nanosecond pulsed lasers can be described analytically by using complementary error function solutions of second-order differential equations. However, their application is limited to cases without loss of material at the surface. Compared to conventional mesh-based techniques, as a novel meshless simulation method, SPH is ideally suited to applications with highly nonlinear and explosive behaviour in laser ablation. However, little is known about the suitability of using SPH for the modelling of laser-material interactions with multiple phases at the micro scale. The present work investigates SPH modelling of pulsed-laser ablation of aluminium where the laser is applied directly to the free-surface boundary of the specimen. Having first assessed the performance of standard SPH surface treatments for functions commonly used to describe laser heating, the heat conduction behaviour of a new SPH methodology is then evaluated through a number of test cases for single-and multiple-pulse laser heating of aluminium showing excellent agreement when compared with an analytical solution. Simulation of real ablation processes, however, requires the model to capture the removal of material from the surface and its subsequent effects on the laser heating process. Hence, the SPH model for describing the transient behaviour of nanosecond laser ablation is validated with a number of experimental and reference results reported in the literature. The SPH model successfully predicts the material ablation depth profiles over a wide range of laser fluences 4-23 J/cm 2 and pulse durations 6-10 ns, and also predicts the transient behaviour of the ejected material during the laser ablation process. Unlike conventional mesh-based methods, the SPH model was not only able to provide the thermo-physical properties of the ejected particles, but also the effect of the interaction between them as well as the direction and the pattern of the ejection.2

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