1. University of Kent

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    1. Mentioned In 239 Articles

    2. Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns

      Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns
      Dental prostheses are sintered in ovens that sometimes suffer from a loss of calibration. This can lead to variations of the sintering temperature outside the range recommended by the manufacturer. Stress and even fractures in dental ceramics may occur, and this leads to the necessity to rebuild the dental construct. The aim of this work is to monitor the quality of sintering processes using an established biomedical imaging techniqueoptical coherence ...
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    3. Akinetic swept laser apparatus and method for fast sweeping of the same

      Akinetic swept laser apparatus and method for fast sweeping of the same
      A detuned resonant mechanism is employed in a laser cavity to modulate in frequency the mode-locking mechanism to achieve high frequency tuning rates, exceeding MHz. The configuration of the laser is compatible with working at sweeping rates close to multiples of the cavity resonance frequency as well as with buffering for increased tuning speeds.
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    4. Down-conversion en-face optical coherence tomography

      Down-conversion en-face optical coherence tomography
      We present an optical coherence tomography (OCT) method that can deliver an en-face OCT image from a sample in real-time, irrespective of the tuning speed of the swept source. The method, based on the master slave interferometry technique, implements a coherence gate principle by requiring that the optical path difference (OPD) between the arms of an imaging interferometer is the same with the OPD in an interrogating interferometer. In this ...
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    5. Noise of supercontinuum sources in spectral domain optical coherence tomography

      Noise of supercontinuum sources in spectral domain optical coherence tomography
      In this paper, we investigate the effect of pulse-to-pulse fluctuations of supercontinuum sources on the noise in spectral domain optical coherence tomography (OCT) images. The commonly quoted theoretical expression for the OCT noise is derived for a thermal light source, which is not suitable if a supercontinuum light source is used. We therefore propose a new, measurement-based OCT noise model that predicts the noise without any assumptions on the type ...
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    6. Real-time high-resolution mid-infrared optical coherence tomography

      Real-time high-resolution mid-infrared optical coherence tomography
      The potential for improving the penetration depth of optical coherence tomography systems by using light sources with longer wavelengths has been known since the inception of the technique in the early 1990s. Nevertheless, the development of mid-infrared optical coherence tomography has long been challenged by the maturity and fidelity of optical components in this spectral region, resulting in slow acquisition, low sensitivity, and poor axial resolution. In this work, a ...
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    7. Supercontinuum in the practice of Optical Coherence Tomography with emphasis on noise effects (Thesis)

      Supercontinuum in the practice of Optical Coherence Tomography with emphasis on noise effects (Thesis)
      Optical Coherence Tomography (OCT) is an imaging modality which has proven, since the early 1990s, its incredible potential. Nowadays, numerous fields of medical investigation, such as Ophthalmology, Dermatology or Cardiovascular imaging, would not be the same without the diagnostic tools bring by OCT. This tremendous development has been supported by industry support through improvement of dedicated components such as lasers, cameras and optics. A great example of this development is ...
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    8. Complex master-slave for long axial range swept-source optical coherence tomography

      Complex master-slave for long axial range swept-source optical coherence tomography
      Using complex master-slave interferometry, we demonstrate extended axial range optical coherence tomography for two commercially available swept sources, well beyond the limit imposed by their k -clocks. This is achieved without k -domain re-sampling and without engaging any additional Mach-Zehnder interferometer providing a k -clock signal to the digitizer. An axial imaging range exceeding 17 mm with an attenuation of less than 30 dB is reported using two commercially available ...
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    9. Recovering distance information in spectral domain interferometry

      Recovering distance information in spectral domain interferometry
      This work evaluates the performance of the Complex Master Slave (CMS) method, that processes the spectra at the interferometer output of a spectral domain interferometry device without involving Fourier transforms (FT) after data acquisition. Reliability and performance of CMS are compared side by side with the conventional method based on FT, phase calibration with dispersion compensation (PCDC). We demonstrate that both methods provide similar results in terms of resolution and ...
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    10. Real‐time High‐Resolution Mid‐infrared Optical Coherence Tomography

      Real‐time High‐Resolution Mid‐infrared Optical Coherence Tomography
      The potential for improving the penetration depth of optical coherence tomography systems by using increasingly longer wavelength light sources has been known since the inception of the technique in the early 1990s. Nevertheless, the development of mid‐infrared optical coherence tomography has long been challenged by the maturity and fidelity of optical components in this spectral region, resulting in slow acquisition, low sensitivity, and poor axial resolution. In this work ...
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    11. Mitigation of Speckle Noise in Optical Coherence Tomograms

      Mitigation of Speckle Noise in Optical Coherence Tomograms
      Optical Coherence Tomography (OCT) is a promising high-resolution imaging technique that works based on low coherent interferometry. However, like other low coherent imaging modalities, OCT suffers from an artifact called, speckle. Speckle reduces the detectability of diagnostically relevant features in the tissue. Retinal optical coherence tomograms are of a great importance in detecting and diagnosing eye diseases. Different hardware or software based techniques are devised in literatures to mitigate speckle ...
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    12. 1-15 of 239 1 2 3 4 ... 14 15 16 »
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  2. About University of Kent

    University of Kent

    University of Kent is a UK higher education institution founded in 1965 and funded by the Higher Education Funding Council for England. There are campus at Cantebury (main campus), Medway, Brussels, Tonbridge, and Transmache.  The Applied Optics Group at the University of Kent school of physical sciences. Research areas include: Optical sensors, Optical fibre sensors, Medical sensors and imaging, Optical coherence tomography, Adaptive optics, Components for optical communications and sensors, Theory, Electro-optical, acousto-optical micro-structures, and Forensics.