High precision dynamic multi-interface profilometry with optical coherence tomography

Lawman, Samuel; Liang, Haida

doi:10.1364/ao.50.006039

Cited by 32 publications

(22 citation statements)

References 30 publications

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“…Therefore the depth profiles need to be corrected by the group refractive index of the material. We determined the time dependent refractive index of the polymer dispersion drop following the method of Lawman & Liang [24] to show the increasing density of the mixture during desiccation. Using this method we also proved that the evolved cavity in the paint drop on hydrophobic surface is consistent with water vapor having the refractive index of 1.…”

Section: Desiccation On Hydrophobic Surface (90mentioning

confidence: 99%

“…In a Fourier-domain instrument, the reference mirror is fixed but the interference fringes as a function of wavelength are obtained through a spectrometer and the axial structure is obtained through a Fourier transform [22]. OCT was invented for in vivo imaging of the eye and most applications are found in the biomedical field, but recently it has also found applications in non-biomedical fields [23] including the monitoring of the drying of thin films of various varnishes [24]. 2…”

Section: Introductionmentioning

confidence: 99%

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Imaging internal flows in a drying sessile polymer dispersion drop using Spectral Radar Optical Coherence Tomography (SR-OCT)

Manukyan

Sauer

Roisman

et al. 2013

Journal of Colloid and Interface Science

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In this work, we present the visualization of the internal flows in a drying sessile polymer dispersion drop on hydrophilic and hydrophobic surfaces with Spectral Radar Optical Coherence Tomography (SR-OCT). We have found that surface features such as the initial contact angle and pinning of the contact line, play a crucial role on the flow direction and final shape of the dried drop. Moreover, imaging through selection of vertical slices using optical coherence tomography offers a feasible alternative compared to imaging through selection of narrow horizontal slices using confocal microscopy for turbid, barely transparent fluids.

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Section: Desiccation On Hydrophobic Surface (90mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Imaging internal flows in a drying sessile polymer dispersion drop using Spectral Radar Optical Coherence Tomography (SR-OCT)

Manukyan

Sauer

Roisman

et al. 2013

Journal of Colloid and Interface Science

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“…It has been used to examine the stratigraphy of paint and varnish layers of historical paintings and shown to be the most sensitive technique for revealing preparatory drawings beneath paint layers owing to its high dynamic range and depth selection capabilities [6]. It has also been used for dynamic monitoring of the wetting and drying of different varnishes [7], varnish removal using solvents [5], real time laser ablation of varnish layers [8] and tracking of canvas deformation due to environmental changes [9]. While OCT has been successfully applied to the examination of the stratigraphy of paintings, the depth resolution of OCTs used in these applications still cannot match the micro-destructive method of optical microscopic examination of paint samples prepared as cross-sections (typical resolution ~1 µm).…”

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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“…In particular, it offers the possibility of noninvasive and non-contact examination of the subsurface microstructure of historic paintings (Fig. 1c), including paint and varnish layers [4][5] [6] [7][8] [9], as well as other historic objects [10] [11]. Currently, the routine method of investigating the stratigraphy is through taking a small sample from a painting, 300-500 µm in size, and preparing it as a cross-section that can be examined under a microscope (Fig.…”

Section: Introductionmentioning

confidence: 99%

Optimum spectral window for imaging of art with optical coherence tomography

et al. 2013

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Optical Coherence Tomography (OCT) has been shown to have potential for important applications in the field of art conservation and archaeology due to its ability to image subsurface microstructures noninvasively. However, its depth of penetration in painted objects is limited due to the strong scattering properties of artists' paints. VIS-NIR (400 nm -2400 nm) reflectance spectra of a wide variety of paints made with historic artists' pigments have been measured. The best spectral window with which to use optical coherence tomography (OCT) for the imaging of subsurface structure of paintings was found to be around 2.2 µm. The same spectral window would also be most suitable for direct infrared imaging of preparatory sketches under the paint layers. The reflectance spectra from a large sample of chemically verified pigments provide information on the spectral transparency of historic artists' pigments/paints as well as a reference set of spectra for pigment identification. The results of the paper suggest that broadband sources at ~2 microns are highly desirable for OCT applications in art and potentially material science in general.

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High precision dynamic multi-interface profilometry with optical coherence tomography

Abstract: This paper was published in Applied Optics

Cited by 32 publications

References 30 publications

Imaging internal flows in a drying sessile polymer dispersion drop using Spectral Radar Optical Coherence Tomography (SR-OCT)

Imaging internal flows in a drying sessile polymer dispersion drop using Spectral Radar Optical Coherence Tomography (SR-OCT)

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

Optimum spectral window for imaging of art with optical coherence tomography

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