Spectroscopic optical coherence tomography : application to the analysis of pigments from pictural layers
type: Dataset
description: The knowledge of materials used in art works helps for their conservation. Optical coherence tomography (OCT) is a technique that was first developed for imaging in biological tissues. In this workit has been applied to the study of pigments in painting layers by the mean of the recent developmentof spatially resolved spectroscopic OCT. Our device is a time domain en face OCT, using a Mirau objective and a visible light source. We found that the optical system introduces aperture effects leading to spectral translation of the measured spectra towards higher wavelengths. We defined a general protocol in order to correct this effect that we used successfully for the measurement of the reflectivity of several gold samples. Pigments are made of scattering particles with randomly shape and micrometric size. Based on theorical and experimental considerations of spherical particles, we show that OCT spectroscopic measurements are morphology-dependent. The strong spread of the results recorded on a sample makes impossible the distinction between two particles of different materials. However, we showed that calculating the average over a large number of particles leads to distinguish two layers juxtaposed or overlaid, which has been verified experimentally with yellow and red pigments. Thus, coupling spectroscopic analysis with 3D imaging improves sample characterization
landing page: https://theses.hal.science/tel-00833277
identifier: NNT: 2012PAO66257
keyword: infoeu-reposemanticsdoctoralthesis
keyword: microscopie
keyword: microscopy
keyword: numerical-aperture
keyword: optical-coherence-tomography
keyword: ouverture-numerique
keyword: pigment
keyword: plein-champ
keyword: spectroscopie
keyword: spectroscopy
keyword: spioptiengineering-sciences-physicsoptics--photonic
keyword: theses
keyword: tomographie-par-coherence-optique
keyword: wide-field
issued: 2026-05-10T18:15:52.323637
modified: 2026-05-10T18:15:52.323641
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Spectroscopic optical coherence tomography : application to the analysis of pigments from pictural layers
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00833277
issued: 2026-05-10T18:15:52.337211
modified: 2026-05-10T18:15:52.306364