1. Articles from Piotr Targowski

    1-24 of 36 1 2 »
    1. Laser cleaning of paintings: in situ optimization of operative parameters through non-invasive assessment by optical coherence tomography (OCT), reflection FT-IR spectroscopy and laser induced fluorescence spectroscopy (LIF)

      Laser cleaning of paintings: in situ optimization of operative parameters through non-invasive assessment by optical coherence tomography (OCT), reflection FT-IR spectroscopy and laser induced fluorescence spectroscopy (LIF)

      Nowadays the use of laser technology as a highly precise tool for the cleaning of paintings is gaining ground. The development of a non-invasive analytical protocol aimed at thorough assessment of the treated surfaces and real time monitoring of the laser cleaning action is thus becoming imperative. This ensures that no side effects (e.g. discoloration, darkening, blackening) will occur on the painting surfaces due to laser ablation. In the present study the potential of the combined use of optical coherence tomography (OCT) and reflection FT-IR spectroscopy for in situ non-invasive assessment of laser cleaning procedures has been investigated on ...

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    2. A Micro-Tomographic Insight into the Coating Systems of Historical Bowed String Instruments

      A Micro-Tomographic Insight into the Coating Systems of Historical Bowed String Instruments

      Musical instruments are tools for playing music, but for some of them—made by the most important historical violin makers—the myths hide the physical artwork. Ancient violin-making Masters developed peculiar construction methods and defined aesthetic canons that are still recognizable in their musical instruments. Recently, the focus of scientific investigations has been set on the characterization of materials and methods used by the ancient violin makers by means of several scientific approaches. In this work, the merits of synchrotron radiation micro-computed tomography and optical coherence tomography (OCT) for the investigation of complex coatings systems on historical bowed string musical ...

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    3. Optical Coherence Tomography (OCT) for Examination of Artworks (Book Chapter)

      Optical Coherence Tomography (OCT) for Examination of Artworks (Book Chapter)

      his book details the application of advanced characterisation techniques and diagnostic tools to heritage science, including the evaluation of heritage assets’ condition, their preservation and restoration. It examines the use of electrochemical techniques in conservation science, with a particular focus on how to solve problems in taking on-site measurements. Specifically, it introduces readers to a new gel polymer (GPE) electrochemical cell developed by the authors for the characterisation of metallic heritage objects. Other techniques used to characterise and monitor reinforced concrete objects in more modern buildings are also covered, including non-destructive electrochemical techniques that allow steel corrosion to be assessed ...

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    4. Optical Coherence Tomography (OCT) for Examination of Artworks (Book Chapter)

      Optical Coherence Tomography (OCT) for Examination of Artworks (Book Chapter)

      Optical coherence tomography is a fast, non-invasive technique of structural analysis utilising near-infrared radiation. Examples of using OCT, for obtaining cross-sectional images of objects of craftsmanship and an easel painting have been shown. Issues regarding the technique of execution and destruction phenomena were resolved non-invasively. In some cases, the secondary alterations can be identified and localised within the object’s structure which helps in authentication of the artwork.

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    5. Professor Andrzej Kowalczyk Celebration Gala

      Professor Andrzej Kowalczyk Celebration Gala

      On September 15 th 2018, the Institute of Physics at Nicolaus Copernicus University in Toruń, Poland, held a special event to celebrate the academic achievements of Professor Andrzej Kowalczyk, on the occasion of his retirement. Professor Kowalczyk has been a great mentor, teacher, scholar and ambassador of science over his lengthy career. At the conclusion of his PhD thesis viva voce on spectroscopy, the great Jabłoński, the grandfather of fluorescence, said “Too much Chemistry, Dr Kowalczyk!” A great part of his scientific work has, indeed, been devoted to the development of spectral domain optical coherence tomography – pure optics, and his ...

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    6. Using Optical Coherence Tomography to Reveal the Hidden History of The Landsdowne Virgin of the Yarnwinder by Leonardo da Vinci and Studio

      Using Optical Coherence Tomography to Reveal the Hidden History of The Landsdowne Virgin of the Yarnwinder by Leonardo da Vinci and Studio

      Optical coherence tomography (OCT) was used for non‐invasive examination of a well‐known, yet complex, painting from the studio of Leonardo da Vinci in combination with routine imaging in various bands of electromagnetic radiation. In contrast with these techniques, OCT provides depth‐resolved information. Three post‐processing modalities were explored: cross‐sectional views, maps of scattering from given depths, and their 3D models. Some hidden alterations of the painting owing to past restorations were traced: retouching and overpainting with their positioning within varnish layers as well as indications of a former transfer to canvas.

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    7. Complementary use of Optical Coherence Tomography (OCT) and Reflection FTIR spectroscopy for in-situ non-invasive monitoring of varnish removal from easel paintings

      Complementary use of Optical Coherence Tomography (OCT) and Reflection FTIR spectroscopy for in-situ non-invasive monitoring of varnish removal from easel paintings

      Although the solvent removal of unwanted layers (e.g. aged varnishes, overpaints, oxalate patinas, dirt from easel paintings is one of the most frequently performed restoration treatments) it is questioned regarding its controllability and safety to the artwork. There is thus a need for developing suited diagnostic methodologies able to inform restorers on the chemical, optical and morphological effects of cleaning. To this aim, we have explored the possibility of complementary use of Optical Coherent Tomography (OCT) and reflection FTIR. On the one hand, the OCT technique provides cross-sectional images with varnish layers visible and thus permits for measurement of ...

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    8. On the application of Optical Coherence Tomography as a complimentary tool in a analysis of the 13th century Byzantine Bessarion Reliquary

      On the application of Optical Coherence Tomography as a complimentary tool in a analysis of the 13th century Byzantine Bessarion Reliquary

      This work presents the results of an application of Optical Coherence Tomography (OCT) to examination a 13th century Byzantine reliquary of unparalleled artistic and historical value. The aim of this work, performed at the initial stage, before the restoration, was focused on the resolution of cleaning procedures regarding both the thick, old varnish and the gold leaf details finely applied on the painted parts of the artwork by means of an integrated approach of non-invasive and invasive analyses and diagnostics. The results allow definition of the thickness of the varnishes, their inner morphology and establishes the presence (or absence) of ...

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    9. The application of macro-X-ray fluorescence and optical coherence tomography for examination of parchment manuscripts

      The application of macro-X-ray fluorescence and optical coherence tomography for examination of parchment manuscripts

      Macro-X-ray fluorescence (XRF) is a newly commercially available research tool very useful in the examination of artwork. Its novelty lies in its ability to create maps of the distribution of chemical elements on scales of a few milimetres. In this contribution, its use together with optical coherence tomography (OCT) in the inspection of an illuminated manuscript is reported for the first time. The former technique is used both for mapping the elemental distribution over large parts of the folios – including illuminated initials – and for quantitative analysis of the composition of the smalt pigment, as well as of changes in the ...

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    10. Apparatus for optical frequency domain tomography with adjusting system

      Apparatus for optical frequency domain tomography with adjusting system

      In an apparatus for imaging of objects by applying optical frequency domain tomography and provided with an adjusting system for setting a relative position of photosensitive elements (174) and a spectrum image (273), the adjusting system is an automatically controlled device causing a relative displacement of at least one photosensitive element (174) of the detection device (173) of the spectrum and the spectrum image (273) between each other. The adjusting system comprises at least one actuator (14, 16) acting on the dispersion device (171) and/or the set of optical elements (172) and/or the detection device (173) and movement ...

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    11. Depth-Resolved Multilayer Pigment Identification in Paintings: Combined Use of Laser-Induced Breakdown Spectroscopy (LIBS) and Optical Coherence Tomography (OCT)

      Depth-Resolved Multilayer Pigment Identification in Paintings: Combined Use of Laser-Induced Breakdown Spectroscopy (LIBS) and Optical Coherence Tomography (OCT)

      A detailed feasibility study on the combined use of laser-induced breakdown spectroscopy with optical coherence tomography (LIBS/OCT), aiming at a realistic depth-resolved elemental analysis of multilayer stratigraphies in paintings, is presented. Merging a high spectral resolution LIBS system with a high spatial resolution spectral OCT instrument significantly enhances the quality and accuracy of stratigraphic analysis. First, OCT mapping is employed prior to LIBS analysis in order to assist the selection of specific areas of interest on the painting surface to be examined in detail. Then, intertwined with LIBS, the OCT instrument is used as a precise profilometer for the ...

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    12. OCT structural examination of Madonna dei Fusi by Leonardo da Vinc

      OCT structural examination of Madonna dei Fusi by Leonardo da Vinc

      Madonna dei Fusi (‘Madonna of the Yarnwider’) is a spectacular example of Italian Renaissance painting, attributed to Leonardo da Vinci. The aim of this study is to give an account of past restoration procedures. The evidence of a former retouching campaign will be presented with cross-sectional images obtained non-invasively with Optical Coherence Tomography (OCT). Specifically, the locations of overpaintings/retouchings with respect to the original paint layer and secondary varnishes will be given. Additionally, the evidence of a former transfer of the pictorial layer to the new canvas support by detecting the presence of its structure incised into paint layer ...

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    13. Training on Application of Optical Coherence Tomography (OCT) to Structural Analysis of Cultural Heritage Objects: June 27–28, 2013 Nicolaus Copernicus University, Torun, Poland

      Training on Application of Optical Coherence Tomography (OCT) to Structural Analysis of Cultural Heritage Objects: June 27–28, 2013 Nicolaus Copernicus University, Torun, Poland

      This two-day training event will be dedicated to traditional and innovative applications of optical coherence tomography (OCT) to the examination of cultural heritage objects. The first day will focus on the scientific background and a review of the state-of-the-art of OCT, as well as applications to cultural heritage. The second day will be devoted to hands-on training. Various objects will be provided by the organizers, but participants are encouraged to bring their own samples – contact Piotr Targowski, Nicolaus Copernicus University, ptarg@fizyka.umk.pl for details. There will be no admission fee. Invitation for submission of oral presentations or posters ...

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    14. Feature Of The Week 11/25/12: Nicolaus Copernicus University Presents Work on Four-Dimensional OCT Imaging Using Graphics Processing Units

      Feature Of The Week 11/25/12: Nicolaus Copernicus University Presents Work on Four-Dimensional OCT Imaging Using Graphics Processing Units

      Nicolaus Copernicus University present the application of graphics processing unit (GPU) programming for real-time three-dimensional (3-D) Fourier domain optical coherence tomography (FdOCT) imaging with implementation of flow visualization algorithms. One of the limitations of FdOCT is data processing time, which is generally longer than data acquisition time. Utilizing additional algorithms, such as Doppler analysis, further increases computation time. The general purpose computing on GPU (GPGPU) has been used successfully for structural OCT imaging, but real-time 3-D imaging of flows has so far not been presented. NCU has developed software for structural and Doppler OCT processing capable of visualization of two-dimensional ...

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    15. Four-dimensional structural and Doppler optical coherence tomography imaging on graphics processing units

      Four-dimensional structural and Doppler optical coherence tomography imaging on graphics processing units

      The authors present the application of graphics processing unit (GPU) programming for real-time three-dimensional (3-D) Fourier domain optical coherence tomography (FdOCT) imaging with implementation of flow visualization algorithms. One of the limitations of FdOCT is data processing time, which is generally longer than data acquisition time. Utilizing additional algorithms, such as Doppler analysis, further increases computation time. The general purpose computing on GPU (GPGPU) has been used successfully for structural OCT imaging, but real-time 3-D imaging of flows has so far not been presented. We have developed software for structural and Doppler OCT processing capable of visualization of two-dimensional (2-D ...

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

      Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review
      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 ...
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    17. Application of optical coherence tomography (OCT) for real time monitoring of consolidation of the paint layer in Hinterglasmalerei objects

      Application of optical coherence tomography (OCT) for real time monitoring of consolidation of the paint layer in Hinterglasmalerei objects
      Optical coherence tomography (OCT) is a fast non-contact and non-invasive technique for examination of objects consisting of transparent or semitransparent layers. Since it is a useful tool for inspection of Hinterglasmalerei paintings, the aim of the experiment was to explore its feasibility for monitoring of the consolidation process, which plays the most important role in the conservation treatment of such artefacts.
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    18. Real-time massively parallel processing of spectral optical coherence tomography data on graphics processing units

      Real-time massively parallel processing of spectral optical coherence tomography data on graphics processing units
      In this contribution we describe a specialised data processing system for Spectral Optical Coherence Tomography (SOCT) biomedical imaging which utilises massively parallel data processing on a low-cost, Graphics Processing Unit (GPU). One of the most significant limitations of SOCT is the data processing time on the main processor of the computer (CPU), which is generally longer than the data acquisition. Therefore, real-time imaging with acceptable quality is limited to a small number of tomogram lines (A-scans). Recent progress in graphics cards technology gives a promising solution of this problem. The newest graphics processing units allow not only for a very ...
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    19. Method And Apparatus For Optical Coherence Tomography

      Method And Apparatus For Optical Coherence Tomography
      The invention relates to optical coherence tomography (OCT), more specifically to spectral optical coherence tomography (SOCT). The invention deals with problem of artefacts occurring in certain scan positions due to sharp increases of reflection by the object under investigation. It solves this problem by using an extra intensity sensor located at an output for non-dispersed light of the dispersive element used for spectral analysis, e. g. in the zero order of a diffraction grating, and using the signal of this sensor for the modification of the interferometric data.
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    20. Feature Of The Week 10/31/10: Nicolaus Copernicus University Researchers Describe Work on Massively Parallel Data Processing for OCT

      Feature Of The Week 10/31/10: Nicolaus Copernicus University Researchers Describe Work on Massively Parallel Data Processing for OCT

      Feature Of The Week 10/31/10: One of the significant limitations of the Fourier domain OCT is the time of data processing on main processor of the computer (CPU), which is longer than the acquisition time. As a result, the real-time 3D volume rendering is possible only for volumes imaged with a little amount of OCT data. Recent progress in massively parallel processing gives a promising solution to this problem. Recently developed graphic processing units (GPUs) allow not only for a very high speed of 3D rendering, but also, for general purpose parallel numerical calculations with efficiency higher than ...

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    21. Real-time imaging for Spectral Optical Coherence Tomography with massively parallel data processing

      Real-time imaging for Spectral Optical Coherence Tomography with massively parallel data processing
      In this paper the application of massively parallel processing of Spectral Optical Coherence Tomography (SOCT) data with the aid of a low-cost Graphic Processing Unit (GPU) is presented. The reported system may be used for real-time imaging of high resolution 2D tomograms or for presenting volume data. The overall imaging speed is over 100 frames/second for 2D tomograms built of 1024 A-scans and 9 frames/second for 3D volume images containing 100 slices of 100 A-scans. This includes t he acquisition of 2048 pixels from a CCD camera per A-scan, data transfer to the processor, all necessary processing and ...
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    22. Structural Examination of Easel Paintings with Optical Coherence Tomography

      Structural Examination of Easel Paintings with Optical Coherence Tomography
      Identification of the order, thickness, composition, and possibly the origin of the paint layers forming the structure of a painting, that is, its stratigraphy, is important in confirming its attribution and history as well as planning conservation treatments. The most common method of examination is analysis of a sample collected from the art object, both visually with a microscope and instrumentally through a variety of sophisticated, modern analytical tools. Because of its invasiveness, however, sampling is less than ideally compatible with conservation ethics; it is severely restricted with respect to the amount of material extirpated from the artwork. Sampling is ...
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    23. Method And Apparatus For Spectral Optical Coherence Tomography (Wo 2009/106358)

      Method And Apparatus For Spectral Optical Coherence Tomography (Wo 2009/106358)
      The invention relates to optical coherence tomography (OCT), more specifically to spectral optical coherence tomography (SOCT). The invention deals with the problem of artefacts due to sharp increases of reflection by the object under investigation. It solves this problem by splitting of a part off the returning light for modification of the interferometric data.
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    24. Picosecond laser ablation system with process control by optical coherence tomography

      In this contribution we describe an apparatus for precise laser ablation of delicate layers, like varnish on pictures. This specific case is very demanding. First of all any changes in colour of remaining varnish layer as well as underneath paint layers are unacceptable. This effect may be induced photochemically or thermically. In the first case strong absorption of the radiation used will eliminate its influence on underlying strata. The thermal effect is limited to so called heat affected zone (HAZ). In addition to colour change, a mechanical damage caused by overheating of the structure adjacent to ablated region should be ...
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    1-24 of 36 1 2 »
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    Optical Coherence Tomography for Non-Destructive Investigations of Structure of Objects of Art Optical Coherence Tomography for Tracking Canvas Deformation Structural Examination of Easel Paintings with Optical Coherence Tomography Real-time imaging for Spectral Optical Coherence Tomography with massively parallel data processing Feature Of The Week 10/31/10: Nicolaus Copernicus University Researchers Describe Work on Massively Parallel Data Processing for OCT Application of optical coherence tomography (OCT) for real time monitoring of consolidation of the paint layer in Hinterglasmalerei objects Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review Training on Application of Optical Coherence Tomography (OCT) to Structural Analysis of Cultural Heritage Objects: June 27–28, 2013 Nicolaus Copernicus University, Torun, Poland Depth-Resolved Multilayer Pigment Identification in Paintings: Combined Use of Laser-Induced Breakdown Spectroscopy (LIBS) and Optical Coherence Tomography (OCT) Structure–Function Correlation Using OCT Angiography And Microperimetry In Diabetic Retinopathy Response to Re: Evaluation of choroidal changes in adolescent idiopathic scoliosis using enhanced depth imaging optical coherence tomography OCT Image-Guided Treatment of Scars (Book Chapter)