1. Articles from H. Liang

    1-6 of 6
    1. Density-Driven Flows in Evaporating Binary Liquid Droplets

      Density-Driven Flows in Evaporating Binary Liquid Droplets

      In the evaporation of microlitre liquid droplets, the accepted view is that surface tension dominates and the effect of gravity is negligible. We report, through the first use of rotating optical coherence tomography, that a change in the flow pattern and speed occurs when evaporating binary liquid droplets are tilted, conclusively showing that gravitational effects dominate the flow. We use gas chromatography to show that these flows are solutal in nature, and we establish a flow phase diagram demonstrating the conditions under which different flow mechanisms occur.

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    2. High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects

      High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects

      Optical Coherence Tomography has been successfully applied to the non-invasive imaging of subsurface microstructure of a variety of materials from biological tissues to painted objects of art. One of the limitations of the technique is the low depth of penetration due to the strong scattering and absorption in the material. Previous studies found that for paint materials, the optimum window for large depth of penetration is around 2.2 microns. This is also true for many other materials with low water content. We have previously demonstrated OCT systems in this wavelength regime for imaging with improved depth of penetration. In ...

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

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

      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 ultra-high resolution fiber-based Fourier domain optical coherence tomography system with a constant axial resolution of 1 ...

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    4. High resolution Fourier domain optical coherence tomography in the 2 um wavelength range using a broadband supercontinuum source

      High resolution Fourier domain optical coherence tomography in the 2 um wavelength range using a broadband supercontinuum source

      A 220 nm bandwidth supercontinuum source in the two-micron wavelength range has been developed for use in a Fourier domain optical coherence tomography (FDOCT) system. This long wavelength source serves to enhance probing depth in highly scattering material with low water content. We present results confirming improved penetration depth in high opacity paint samples while achieving the high axial resolution needed to resolve individual paint layers. This is the first FDOCT developed in the 2 μm wavelength regime that allows fast, efficient capturing of 3D image cubes at a high axial resolution of 13 μm in air (or 9 μm ...

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    5. Optical coherence tomography in the 2um wavelength regime for paint and other high opacity materials

      Optical coherence tomography in the 2um wavelength regime for paint and other high opacity materials

      An optical coherence tomography system using a compact fiber source emitting amplified spontaneous emission at central wavelength of 1960 nm with bandwidth of 40 nm is developed to enhance the probing depth in a highly scattering material with low water content. Examples of application to paint are used to demonstrate significantly improved penetration depth in high opacity materials in the 2-μm wavelength regime.

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    6. Long wavelength optical coherence tomography for imaging of painted objects

      Long wavelength optical coherence tomography for imaging of painted objects

      Optical Coherence Tomography has been successfully applied to the imaging of painted objects in recent years. However, a significant limitation is the low penetration depth of OCT in paint because of the high opacity of paint due to either scattering or absorption. It has been shown that the optimum spectral window for OCT imaging of paint layers is around 2.2μm in wavelength. In this paper, we demonstrate a 1950nm OCT for imaging painted objects using a superfluorescent fiber source at low power.

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    1-6 of 6
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  2. Topics in the News

    1. (5 articles) Nottingham Trent University
    2. (4 articles) University of Southampton
    3. (4 articles) Haida Liang
    4. (1 articles) University of Kent
    5. (1 articles) Wakayama Medical University
    6. (1 articles) Takashi Tanimoto
    7. (1 articles) Yoshiki Matsuo
    8. (1 articles) Akio Kuroi
    9. (1 articles) Hironori Kitabata
    10. (1 articles) Atsushi Tanaka
    11. (1 articles) Takashi Akasaka
    12. (1 articles) Takashi Kubo
    13. (1 articles) Optovue
    14. (1 articles) Topcon Medical Systems
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    Long wavelength optical coherence tomography for imaging of painted objects Optical coherence tomography in the 2um wavelength regime for paint and other high opacity materials High resolution Fourier domain optical coherence tomography in the 2 um wavelength range using a broadband supercontinuum source Ultra-high resolution Fourier domain optical coherence tomography for old master paintings High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects Density-Driven Flows in Evaporating Binary Liquid Droplets Cost inhibits adoption of SS-OCT Association of Hemodynamic Severity With Plaque Vulnerability and Complexity of Coronary Artery Stenosis: A Combined Optical Coherence Tomography and Fractional Flow Reserve Study A lotus root-like appearance in a spontaneously recanalized lesion confirmed by serial coronary angiography from optical coherence tomography study Hyperreflective Vitreous Opacities on Optical Coherence Tomography in a Patient With Bilateral Retinoblastoma Vessel density and En-face segmentation of optical coherence tomography angiography to analyse corneal vascularisation in an animal model Single-shot wavelength-independent phase-shifting method for full-field optical coherence tomography