Structural and optical properties of wood and wood finishes studied using optical coherence tomography: application to an 18th century Italian violin

Latour, Gaël; Échard, Jean-Philippe; Soulier, Balthazar; Émond, Isabelle; Vaiedelich, Stéphane; Elias, Mady

doi:10.1364/ao.48.006485

Cited by 42 publications

(27 citation statements)

References 21 publications

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“…Initially full field time domain OCTs using white light sources in the visible part of the spectrum were constructed to reach high depth resolutions of ~1 µm [10,11], however, they have low sensitivity compared with systems using laser sources and have very limited depth penetration as most paints are opaque in the visible range [12].…”

Section: Introductionmentioning

confidence: 99%

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Cheung¹,

Spring²,

Liang³

2015

Opt. Express

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Abstract:In the last 10 years, Optical Coherence Tomography (OCT) has been successfully applied to art conservation, history and archaeology. OCT has the potential to become a routine non-invasive tool in museums allowing cross-section imaging anywhere on an intact object where there are no other methods of obtaining subsurface information. While current commercial OCTs have shown potential in this field, they are still limited in depth resolution (> 4 μm in paint and varnish) compared to conventional microscopic examination of sampled paint cross-sections (~1 μm). An ultrahigh resolution fiber-based Fourier domain optical coherence tomography system with a constant axial resolution of 1.2 μm in varnish or paint throughout a depth range of 1.5 mm has been developed. While Fourier domain OCT of similar resolution has been demonstrated recently, the sensitivity roll-off of some of these systems are still significant. In contrast, this current system achieved a sensitivity roll-off that is less than 2 dB over a 1.2 mm depth range with an incident power of ~1 mW on the sample. The high resolution and sensitivity of the system makes it convenient to image thin varnish and glaze layers with unprecedented contrast. The non-invasive 'virtual' cross-section images obtained with the system show the thin varnish layers with similar resolution in the depth direction but superior clarity in the layer interfaces when compared with conventional optical microscope images of actual paint sample cross-sections obtained microdestructively.

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Section: Introductionmentioning

confidence: 99%

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Cheung¹,

Spring²,

Liang³

2015

Opt. Express

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“…In a similar way, also for CPM as full-field imaging technique a comparable tendency focusing on material research can be noted [4]. Exploiting CPM imaging for micro-material inspection represents the aim in our experimental optical configuration.…”

Section: Introductionmentioning

confidence: 74%

Coherence Probe Microscopy Imaging and Analysis for Fiber-Reinforced Polymers

et al. 2011

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Abstract. The potential of full-field low coherence interferometric techniques for imaging internal structures, such as fibers, interfaces, or inclusions in technical materials is demonstrated by our coherence probe microscopy (CPM) setup. However, the huge amount of recorded data demand for an automatized enhancement and evaluation of the image data. We propose an automatic image analysis procedure adapted for full-field coherence probe microscopy, which we tested on fiber composite materials. The performed image enhancement and orientation analysis finally allow to cluster the internal fiber structures, to detect outliers and enable an improved characterization of investigated specimens supporting a sophisticated material design for the future.

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“…Superb axial (1.5 µm) and lateral (1.0 µm) resolutions were reported by Latour et al with the use of red (visible) light and a Full-Field TdOCT system with Mireau objective for examination of pigmented lacquers on slabs [22] and of the coatings on an historic violin [24]. However, a disadvantage of microscope system used lies in the limited lateral field of view.…”

Section: Examination Of the Structure And State Of Preservation Of Pamentioning

confidence: 95%

“…Among those devoted to examination of cultural heritage objects, the most comprehensive description of TdOCT instruments may be found in [13][14][15][16][17], of SdOCT systems in [7,18], and of SSOCT in [17,[19][20][21]. Solutions for FullField OCT with the Mireau interferometer are discussed in [22][23][24], and with the Linnik configuration of a Michelson interferometer in [25]. In addition, a polarisation-sensitive TdOCT tomography, in an application to the examination of parchment, is described in [26].…”

Section: Oct Systems Used For Examination Of Cultural Heritage Objectsmentioning

confidence: 99%

Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review

2011

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A brief introduction to Optical Coherence Tomography (OCT) is presented, stressing the origin of the tomographic signal and the detection methods defining various modalities of the technique. The parameters of the tomographs, such as axial and lateral resolution, wavelength and intensity of the probing light, imaging range, time of examination, and sensitivity are then defined, and a paradigm for interpreting the OCT tomograms provided. The second part of the article comprises a review of the utilisation of OCT for structural examination of artworks, illustrated with some representative results. Applications to the structural imaging of semi-transparent subsurface layers such as varnishes and glazes, of underdrawings and of reverse painting on glass, are described first, and then applications in the examination of the structure and state of preservation of historic glass, jade, glazed porcelain and faience are discussed. Finally, the use of OCT combined with LIBS analysis and laser ablation of surface layers is presented.

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Structural and optical properties of wood and wood finishes studied using optical coherence tomography: application to an 18th century Italian violin

Cited by 42 publications

References 21 publications

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Ultra-high resolution Fourier domain optical coherence tomography for old master paintings

Coherence Probe Microscopy Imaging and Analysis for Fiber-Reinforced Polymers

Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review

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