Haida Liang
Nottingham Trent University, School of Science & Technology, Faculty Member
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We correct a mistake in the OCT system sensitivity given in our recent paper [Opt. Express23(3), 1992 (2015) 10.1364/OE.23.00199225836070].
Research Interests: Optics, Optical coherence tomography, Medicine, Science for Conservation and Restoration of Cultural Heritage, Broadband, and 8 moreSupercontinuum Generation, Heritage Science, Optical physics, Oil painting, Fourier transform, Wavelength, Analysis of Pigments on Ancient Artifacts, and Electrical And Electronic Engineering
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This paper will introduce a new application of Optical Coherence Tomography (OCT) to the monitoring of vulnerability of rock art monuments in-situ. The porosity of the host rock is an important factor affecting the susceptibility of rock... more
This paper will introduce a new application of Optical Coherence Tomography (OCT) to the monitoring of vulnerability of rock art monuments in-situ. The porosity of the host rock is an important factor affecting the susceptibility of rock art monuments to decay. Pore characteristics of rocks are one of the main factors that control the intensity of physical deterioration. OCT has
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Research Interests: Mechanical Engineering, Materials Science, Optics, Optical coherence tomography, Medicine, and 9 moreThree Dimensional Imaging, Applied Optics, Optical physics, Image Enhancement, Reproducibility of Results, Sensitivity and Specificity, Equipment Design, Equipment Failure Analysis, and Electrical And Electronic Engineering
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Research Interests: Geology, Remote Sensing, Cultural Heritage, Painting, Silk Road, and 13 moreScience for Conservation and Restoration of Cultural Heritage, Wall Paintings, History of Pigments, Geomatic Engineering, Heritage Science, UNESCO world heritage, Science for Conservation and Restoration of Cultural Heritage and History of Architecture, Spectral Imaging System, Analysis of Pigments on Ancient Artifacts, Architectural Heritage Conservation, Spectral Imaging, Multi-spectral Imaging, and Multispectral image
Research Interests: Materials Science, Optics, Optical coherence tomography, Science for Conservation and Restoration of Cultural Heritage, Opacity, and 10 moreSupercontinuum Generation, Heritage Science, Optical physics, Oil painting, Wavelength, Tk, QC, Penetration Depth, Analysis of Pigments on Ancient Artifacts, and Electrical And Electronic Engineering
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Research Interests: Archaeology, Computer Science, Artificial Intelligence, Materials Science, Art, and 15 moreSensor, Painting, Drawing, Studies, Commerce, New, Mosaic, High Resolution, EST, Infrared, Plan, Image Sensor, Routledge, Origin, and Pixel
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We present an overview of the current status and the future of observations of the Sunyaev-Zel’dovich effect. In particular we examine the capabilities of an upgraded Australia Telescope for detecting the SZ effect.
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Research Interests: Engineering, Computer Science, Optics, Cultural Heritage, Archaeological Science, and 9 moreOptical coherence tomography, Optical Imaging, Science for Conservation and Restoration of Cultural Heritage, Microfading and anoxic framing, Spectral Imaging System, Analysis of Pigments on Ancient Artifacts, Spectral Imaging, Multi-spectral Imaging, and Microfading spectrometry
The murals of the Tang Tomb are important materials for studying the social life of the Tang Dynasty, which have important protection and research value. In order to protect the tomb murals as longer as possible, it is necessary to... more
The murals of the Tang Tomb are important materials for studying the social life of the Tang Dynasty, which have important protection and research value. In order to protect the tomb murals as longer as possible, it is necessary to restore the murals and accurately record the restore location. Nevertheless,the restored murals are difficult to observe directly the restore area through the human eye. This paper proposes a method to reveal the restored areas, by extracting the main components of the Multi-Hyper-spectral image of the mural with the Minimum Noise Fraction (MNF) Rotation, and the location of the restored area is clearly observed from the main component. In addition, the mural sketch reflects the main content of the mural of the Tang Tomb murals, which are of great significance to the restoration and protection of the Tang Tomb murals. In this paper, we also proposed a new method to extract the sketch of Tang Tomb mural. For the bands sensitive to the composition of the sketches, the sparsely constrained sparse non-negative matrix under- approximation method is used to decompose the optimal sketches composition, and then the sketches are automatically extracted based on the idea of layer superposition. Through the experiments on the mural paintings in the three tombs, the results demonstrated that the proposed method could effectively perceive the area of mural restoration and automatically extract the sketch accurately and clearly, while saving manpower.
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ABSTRACT Wavelength-swept operation of cladding-pumped and core-pumped thulium-doped fiber lasers using a novel intracavity rotating disk wavelength-scanning arrangement is reported. Scanning ranges from 1905-2049nm (for cladding pumping)... more
ABSTRACT Wavelength-swept operation of cladding-pumped and core-pumped thulium-doped fiber lasers using a novel intracavity rotating disk wavelength-scanning arrangement is reported. Scanning ranges from 1905-2049nm (for cladding pumping) and 1768-1956nm (for core pumping) were obtained.
Research Interests: Materials Science, Optics, Laser, Fiber Laser, Optoelectronics, and 4 moreWavelength, Tk, QC, and Thulium
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Research Interests: Geography, Optics, Remote Sensing, Multispectral Imaging, Art Conservation, and 12 moreNear Infrared, Wall painting, Science for Conservation and Restoration of Cultural Heritage, Colour, Heritage Science, Hyperspectral Imaging, Tunable Filter, Infrared, Spectral Imaging System, Spectral Imaging, óPtica, and Multispectral image
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Research Interests: Materials Science, Archaeological Science, Optical coherence tomography, Science for Conservation and Restoration of Cultural Heritage, Heritage Science, and 7 moreOil painting, Radiative Transfer, Analysis of Pigments on Ancient Artifacts, Spectral Imaging, Multi-spectral Imaging, Multispectral image, and Kubelka Munk
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Typically, varnish coatings were applied to Old Master paintings to improve their visual appearance, saturating the colours. However, over time, varnishes deteriorate and discolour, obscuring or altering the appearance of the artwork,... more
Typically, varnish coatings were applied to Old Master paintings to improve their visual appearance, saturating the colours. However, over time, varnishes deteriorate and discolour, obscuring or altering the appearance of the artwork, necessitating their removal (usually through the use of a solvent) and replacement. Varnish removal presents a degree of risk to the paint surface and may result in loss of original materials or other damage. Thus, diagnostic methods that can support conservators during varnish removal are very valuable. Optical Coherence Tomography (OCT), a white light interferometry technique based on the Michelson interferometer, has been proposed as an ideal tool for monitoring the cleaning and treatment of artworks and historical objects. This is owing to its ability to provide non-invasive and accurate measurements across the entire surface of an artwork of the stratigraphy of transparent and turbid multi-layered structures. In many cases, however, difficulties may arise when attempting to distinguish degraded glaze layers on paintings (coloured, translucent layers containing pigments with refractive indices very close to the binding medium) from layers of aged varnish due to similarities in their appearance and scattering properties in OCT scans. In order to mitigate the possibility of damage through the accidental removal of glaze layers, we propose a simple and entirely non-invasive technique to identify the spectral features of a semi-transparent layer using a combination of OCT and spectral imaging in the visible range. Building on preliminary studies 1,2, the technique utilises an algorithm to automatically obtain the thickness distribution of the surface layers from the OCT volume of a region with relatively uniform pigmentation and colour. This information is then coupled with the spectral data from the same region to derive the spectral characteristics of each translucent surface layer. Such characteristics may then be used to the discriminate between aged varnishes and glaze layers. The potential of this approach has been demonstrated on mock-up samples and paintings from the National Gallery in London. [1] Lange, R., Liang, H., Howard, H. and Spooner, J., “Optical coherence tomography and spectral imaging of a wall painting,” SPIE Newsroom (2011). [2] Liang, H., Lange, R., Howard, H. and Spooner, J., “Non-invasive investigations of a wall painting using optical coherence tomography and hyperspectral imaging,” Proc. SPIE 8084, 80840F (2011).
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The complementary use of X-ray fluorescence (XRF) mapping, spectral imaging, and Raman mapping, allows for the analysis and identification of important artistic materials used in the production and illustration of illuminated manuscripts.... more
The complementary use of X-ray fluorescence (XRF) mapping, spectral imaging, and Raman mapping, allows for the analysis and identification of important artistic materials used in the production and illustration of illuminated manuscripts. This project uses combined non-invasive imaging techniques to analyse 17th – 19th century manuscripts from the British Library’s Southeast Asia Collections so that more can be understood about the adoption and evolution of artistic materials and techniques used in Maritime Southeast Asia. Using multiple different imaging techniques has shown to provide positive results, however, a consequence of this is the collection of large amounts of data, necessitating the automatic and unsupervised analytical techniques used in machine learning. Data collected in-situ at the British Library using macro-XRF mapping, macro-Raman mapping, and Spectral Imaging, will be analysed using a range of machine learning techniques to cluster pixel information representing...
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Research Interests: Engineering, Materials Science, Medicine, Fourier Analysis, Cryotherapy, and 15 moreHumans, Child, Female, Male, Clinical Sciences, Heritage Science, Aged, High Resolution, Adult, Analysis of Pigments on Ancient Artifacts, Body Fluids, Electrical And Electronic Engineering, Exudates and Transudates, Cysticercosis, and Macula lutea
A mobile remote standoff Raman spectroscopy system operational at typical distances of 10 m was developed specifically for research of historical sites and wall paintings recently. Here we present an upgrade to that system informed by a... more
A mobile remote standoff Raman spectroscopy system operational at typical distances of 10 m was developed specifically for research of historical sites and wall paintings recently. Here we present an upgrade to that system informed by a thorough experimental investigation of the relevant laser-induced degradation issues. Reflectance spectroscopy as a more sensitive technique than Raman spectroscopy was used for monitoring and a new phenomenon of reversible alterations was detected in many paint samples at very low laser intensities of less than 1 W/cm2 when Raman measurements detected no changes. Contrary to conventional wisdom, the intensity threshold for safe operation was found to decrease significantly for larger incident irradiation area in the case of a vermilion oil paint sample. Damage threshold in intensity for each material needs to be determined for different spot sizes, which can be orders of magnitude lower for 1 mm spot size compared with micro-Raman. Results from this...