Evaluation of LIBS LIF Raman spectroscopies to analyze materials from cultural heritage

par Delphine Syvilay

Thèse de doctorat en Génie électrique et électronique - Cergy

Sous la direction de Stéphane Serfaty et de Nicolas Wilkie-Chancellier.

Soutenue le 17-06-2016

à Cergy-Pontoise , dans le cadre de École doctorale Sciences et ingénierie (Cergy-Pontoise, Val d'Oise) , en partenariat avec Systèmes et applications des technologies de l'information et de l'énergie (Gif-sur-Yvette, Essonne ; 2002-....) (laboratoire) .

Le président du jury était Isabelle Ledoux-Rak.

Le jury était composé de Loïc Martinez, Vincent Detalle, Annick Texier.

Les rapporteurs étaient Demetrios Anglos, Alexandre Semerok.

mots clés

• Libs
• Lif
• Raman

Titre traduit

Evaluation des techniques LIBS LIF RAMAN pour l'analyse des Matériaux du patrimoine

Résumé

Pas de résumé en français

mots clés

• Libs
• Lif
• Raman

Résumé

One of the new challenges of conservation science is the development of field instrumentation to analyze works of art. In order to get the most information on the material, it is often necessary to perform complementary analyses by juggling different analytical techniques. This time-consuming drawback involves a difficulty to analyze the artwork on the same spot of the surface. However, some of spectroscopies have in common to use the same laser as excitation source and the collection of the emitted signal could be recorded by the same spectrometer. In this spirit, the aim of this research project is the development of a hybrid system in laboratory grouping together three analytical techniques (LIBS, LIF and Raman spectroscopy) in a single instrument. The relevance for combining these three spectroscopies is to identify a material (molecular and elemental analysis) without any preliminary preparation, regardless of its organic or inorganic nature, on the surface and in depth, without any surrouding light interference thanks to time-resolution. Such instrumentation would allow to characterize different materials from cultural heritage such as copper corrosion products and wall paintings organized in stratigraphic layers which are the example of applications in this work. A complete study on LIBS-LIF-Raman hybrid was carried out from conception to instrumental achievement, as well as automatic control to data fusion processings in order to elaborate a strategy of analysis according to the material and to be able to address conservation issues.