1. Adrian Bradu

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    1. Mentioned In 108 Articles

    2. 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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    3. Group refractive index and group velocity dispersion measurement by complex master slave interferometry

      Group refractive index and group velocity dispersion measurement by complex master slave interferometry
      This paper demonstrates that the complex master slave interferometry ( CMSI ) method used in spectral domain interferometry ( SDI ) can efficiently be used for accurate refractive index and group velocity dispersion measurements of optically transparent samples. For the first time, we demonstrate the relevance of the phase information delivered by CMSI for dispersion evaluations with no need to linearize data. The technique proposed here has been used to accurately measure the group ...
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    4. Multispectral photoacoustic microscopy and optical coherence tomography using a single supercontinuum source

      Multispectral photoacoustic microscopy and optical coherence tomography using a single supercontinuum source
      We report on the use of a single supercontinuum (SC) source for multimodal imaging. The 2-octave bandwidth (4752300 nm) makes the SC source suitable for optical coherence tomography (OCT) as well as for multispectral photoacoustic microscopy (MPAM). The IR band centered at 1310 nm is chosen for OCT to penetrate deeper into tissue with 8 mW average power on the sample. The 500840 nm band is used for MPAM. The ...
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    5. PhD Scholarship: Multimodal optical coherence tomography / multi-spectral photo-acoustic imaging at University of Kent

      PhD Scholarship: Multimodal optical coherence tomography / multi-spectral photo-acoustic imaging at University of Kent
      ...-sciences/research/aog/index.html Contact: For further information or informal enquiries, please contact Dr. Adrian Bradu (a.bradu@kent.ac.uk). How to Apply: To apply please go to: http://www.kent.ac.uk/courses/postgr...
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    6. Assessment of Ductile, Brittle, and Fatigue Fractures of Metals Using Optical Coherence Tomography

      Assessment of Ductile, Brittle, and Fatigue Fractures of Metals Using Optical Coherence Tomography
      ome forensic in situ investigations, such as those needed in transportation (for aviation, maritime, road, or rail accidents) or for parts working under harsh conditions (e.g., pipes or turbines) would benefit from a method/technique that distinguishes ductile from brittle fractures of metalsas material defects are one of the potential causes of incidents. Nowadays, the gold standard in material studies is represented by scanning electron microscopy (SEM). However, SEM ...
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    7. Passive optical module for polarization-sensitive optical coherence tomography systems

      Passive optical module for polarization-sensitive optical coherence tomography systems
      The paper presents a proof-of-concept polarization-sensitive swept source optical coherence tomography (OCT) system that performs measurements of the retardance as well as of the axis orientation of a linear birefringent sample. The system performs single input state polarization-sensitive OCT and employs an optical module based on optically passive elements such as two beam displacers and a Faraday rotator. Our implementation of the PS-OCT system does not need any calibration step ...
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    8. Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography

      Effects of Temperature Variations during Sintering of Metal Ceramic Tooth Prostheses Investigated Non-Destructively with Optical Coherence Tomography
      Calibration loss of ovens used in sintering metal ceramic prostheses leads to stress and cracks in the material of the prostheses fabricated, and ultimately to failure of the dental treatment. Periodic calibration may not be sufficient to prevent such consequences. Evaluation methods based on firing supplemental control samples are subjective, time-consuming, and rely entirely on the technicians skills. The aim of this study was to propose an alternative procedure for ...
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    9. Polarization-sensitive plug-in optical module for a Fourier-domain optical coherence tomography system

      Polarization-sensitive plug-in optical module for a Fourier-domain optical coherence tomography system
      In this manuscript we communicate a theoretical study on a plug-in optical module to be used within a Fourier-domain optical coherence tomography system (FD-OCT). The module can be inserted between the object under investigation and any single-mode fiber based FD-OCT imaging instrument, enabling the latter to carry out polarization measurements on the former. Similarly to our previous communication1 this is an active module which requires two sequential steps to perform ...
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    10. Master/slave: the ideal tool for coherence revival based optical coherence tomography imaging instruments

      Master/slave: the ideal tool for coherence revival based optical coherence tomography imaging instruments
      In this communication, we present the utility of the Master/Slave (MS) method in combination with the coherence revival technique to obtain full axial range Optical Coherence Tomography (OCT) cross-section images. The MS method eliminates two major drawbacks of the conventional Fourier Transformed (FT) based OCT technology when applied to the coherence revival technique: the need of data re-sampling as well as the need to compensate for unbalanced dispersion in ...
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    11. Master/slave based optical coherence tomography for in-vivo, real-time, long axial imaging range of the anterior segment

      Master/slave based optical coherence tomography for in-vivo, real-time, long axial imaging range of the anterior segment
      In this report, we demonstrate that in a coherence revival (CR) based swept source optical coherence tomography (SSOCT) set-up, real-time cross-sectional long-range images can be produced via the Master Slave (MS) method. The total tolerance of the MS method to nonlinear tuning, to dispersion in the interferometer and to dispersion due to the laser cavity, makes the MS ideally suited to the practice of coherence revival. In addition, enhanced versatility ...
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    12. Gabor fusion master slave optical coherence tomography

      Gabor fusion master slave optical coherence tomography
      This paper describes the application of the Gabor filtering protocol to a Master/Slave (MS) swept source optical coherence tomography (SS)-OCT system at 1300 nm. The MS-OCT system delivers information from selected depths, a property that allows operation similar to that of a time domain OCT system, where dynamic focusing is possible. The Gabor filtering processing following collection of multiple data from different focus positions is different from that ...
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    13. Acousto-optic tunable filter for dispersion characterization of time-domain optical coherence tomography systems

      Acousto-optic tunable filter for dispersion characterization of time-domain optical coherence tomography systems
      A broadband supercontinuum light source with an acousto-optic tunable filter (AOTF) are used to characterize dispersion in two time-domain OCT systems, at 850 and 1300 nm. The filter is designed to sweep across two spectral ranges, which are restricted here from 800 to 900 nm and from 1200 to 1500 nm, respectively. Dispersion compensation for 850 nm was achieved with a spectral delay line. Dispersion compensation for 1300 nm was ...
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    14. Method and apparatus for processing the signal in spectral domain interferometry and method and apparatus for spectral domain optical coherence tomography

      Method and apparatus for processing the signal in spectral domain interferometry and method and apparatus for spectral domain optical coherence tomography
      Real-time depth measurements in sensing in spectral domain interferometry and for en-face and cross section image production in optical coherence tomography can operate without any need to linearize the data to maximize the output signal and achieve the theoretical depth resolution. Novel interferometry is disclosed, where parameters of a master interferometer dictate the results in a slave interferometer. The master interferometer can be the same measuring interferometer used in two ...
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  2. About Adrian Bradu

    Adrian Bradu

    Adrian Bradu is a Research Associate in the Applied Optics Group (AOG), School of Physical Sciences, University of Kent, Canterbury, UK. He has published widely in the field of optical coherence tomography (more than 30 articles in world’s best optics journals, and more than 80 conference proceedings). Results of his research work were communicated in more than 135 conferences, workshops and meetings. Also he has co-authored a book chapter, has been awarded a patent and has several patent applications pending. His Google Scholar h-index and citations have reached 11 and over 580, respectively. Currently he is developing his research in the AOG, under the support of an European Research Council Grant, Advanced Grant fellowship awarded to Prof. Adrian Podoleanu, ”Combined time domain and spectral domain coherence gating for imaging and biosensing”. He explore how to combine principles of spectral interferometry with principles of time domain interferometry to implement novel configurations up to proof of concept, applicable to bio-sensing and cell, tissue imaging or imaging of different materials.