- In the Field of Mechatronics and Controll Engineering, Social Robotics, Ergonomics & Human Factors, New social movements, Estimation and Filtering Theory, Biosensors, and 34 moreBioMEMS, Nanofabrication, Laser Materials Processings - Photonic devices - Nonlinear optics, Mechatronics and Robotics, Multi Sensor Data Fusion, Mechatronic, Nanophotonics, Materials Science & Engineering, MEMS design: Sensors and Actuators, Biomaterials Engineering, Artificial Life, Lab On A Chip, MEMS sensor, Microfabrication, Plasmonics, BioMedical Devices, Biopolymers, Electromagnetic metamaterials, Materials Characterisation, Biomimetics, Biocomposites, Biodegradable polymer composites, Metamaterials, 3D Reconstruction, Microfluidics, Nanoindentation, Optoelectronics, Fingerprint Recognition, Digital Archaeology, Mechatronics Engineering, Microstructure, Conferences, Digital Photogrammetry applied to Archaeology, and Nanofluidicsedit
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In this work we present application of opto-numerical methodology for improvement of functional parameters of polymer optical bridges working as splices between two optical fibers. Optical bridges are formed by means of... more
In this work we present application of opto-numerical methodology for improvement of functional parameters of polymer optical bridges working as splices between two optical fibers. Optical bridges are formed by means of photopolymerization with light emerging from one fiber and coupled into the second axially-aligned fiber, therefore creating a stable mechanical connection. To fully determine and improve properties of this kind of microstructures, experimental methods are combined with numerical modeling. The parameters describing functionality of the polymer optical bridges are optical losses (insertion and return), which determine the usability of those elements as optical fiber splices. These parameters are the function of such features as: refractive index distribution, geometry of the microstructure and the wavelength of propagating light. To analyze the relation of those features on the functional parameters of the studied microstructures, the experimental results are compared to the ones obtained with simulations. Numerical modeling of aforementioned optical bridges is performed by means of the finite-difference time-domain method, which allows analysis of the electromagnetic field propagating through the microstructure. Experimental methods consist of optical diffraction tomography, which is used in order to obtain full three-dimensional refractive index distribution of optical bridge, and measurements of optical losses. Implementation of the proposed methodology in iterative procedure allows to optimize the fabrication procedure in order to produce efficient and reliable optical splices with desired functional parameters – insertion loss at the level 0.2 dB and return loss below -60 dB.
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Abstract Although Digital Image Correlation (DIC) provides capabilities of scaling a field-of-view (FOV), dimensions of some industrial installations in many cases are too big to be measured with DIC based on a single camera pair. In this... more
Abstract Although Digital Image Correlation (DIC) provides capabilities of scaling a field-of-view (FOV), dimensions of some industrial installations in many cases are too big to be measured with DIC based on a single camera pair. In this paper we present two strategies of spatial stitching of data obtained with multi-camera DIC systems that can be used for engineering failure analysis, namely strategy for the case when there are overlapping FOVs of 3D DIC setups and strategy for the case when 3D DIC setups are distributed and not necessarily have overlapping FOVs. Data obtained with the presented methodologies can be used to verify or update FEM models of the investigated objects. Two practical applications of the multi-camera DIC system are described in order to show its feasibility in engineering failure analysis.
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The results of quantitative, label-free measurements of SHSY-5Y cells under Low-Level Laser Therapy treatment are presented. The time-lapse investigations performed by means of digital holographic microscopy are focused on dry mass... more
The results of quantitative, label-free measurements of SHSY-5Y cells under Low-Level Laser Therapy treatment are presented. The time-lapse investigations performed by means of digital holographic microscopy are focused on dry mass density changes after light exposure.
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ABSTRACT Detailed investigations of the projection moire and grid projection methods used for the computer aided studies of the shape of the muscle-osseous system and postural deformities are presented. The shape determination process is... more
ABSTRACT Detailed investigations of the projection moire and grid projection methods used for the computer aided studies of the shape of the muscle-osseous system and postural deformities are presented. The shape determination process is readily automated using the phase methods for analyzing the fringe patterns. The issue of subtracting the reference surface inherent to the measurement-by-comparison methods is discussed. Specialized medical software for studying the deformity of the back and front of the human body illustrated by clinical examples is presented.
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ABSTRACT The principles of operation and optomechanical design of novel optical extensometer OPEX for tensile testing machines is presented. The system provider on-line strain measurements performed at an arbitrary measurement base. OPEX... more
ABSTRACT The principles of operation and optomechanical design of novel optical extensometer OPEX for tensile testing machines is presented. The system provider on-line strain measurements performed at an arbitrary measurement base. OPEX is integrated with a tensile loading machine so it can be used for active controlling of the machine setup. The applicability of the system is demonstrated by determination of elongation of various mechanical samples subjected to uniaxial tensile tests.
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The 50th anniversary of Dennis Gabor’s Nobel prize (1971) and the upcoming 60th anniversary of the work of both Yuri N. Denisyuk (1962) and Emmett N. Leith, Juris Upatnieks (1962) are excellent reasons to look back at the inventions and... more
The 50th anniversary of Dennis Gabor’s Nobel prize (1971) and the upcoming 60th anniversary of the work of both Yuri N. Denisyuk (1962) and Emmett N. Leith, Juris Upatnieks (1962) are excellent reasons to look back at the inventions and the great pioneers of holography. In the talk at first I present my personal look at the timeline of optical and digital holography with focus on 2D and 3D holographic microscopy. Next I will address several metrological problems connected with 2D and 3D quantitative phase imaging based on data gathered by means of digital holography microscopy, holographic tomography and combined holographic tomography and optical coherence tomography .
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In this paper we discuss the influence of the camera noise in holographic projections measurements on the accuracy of reconstruction in the limited projection angle optical diffraction tomography (LAODT). To counteract the shortcomings of... more
In this paper we discuss the influence of the camera noise in holographic projections measurements on the accuracy of reconstruction in the limited projection angle optical diffraction tomography (LAODT). To counteract the shortcomings of LAODT due to “missing cone” problem we apply generalized total variation iterative constraint (GTVIC) algorithm which replenishes the spectral contents of the reconstruction. To investigate the influence of the noise on result of the GTVIC reconstruction we perform systematic numerical experiments based on simulated phantom mimicking a cell and tailored to the measurement parameters of LAODT system. Next, to mitigate the disruptive influence of noise we test the efficiency of two denoising procedures based on blockmatching technique, namely BM3D and BM4D. Thanks to the properties of those algorithms, the denoising may be applied directly on holograms or hologram stacks, without destroying the fringes. The tomographic GTVIC reconstruction results from data after filtration will be compared with noise-free reconstruction, in reference to the simple median filtering of the noisy reconstruction.
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The paper presents modifications of full-field optical methods commonly used to test the surface quality of optical components used for forming a high power laser beam and tests of a final wavefront. The modifications in reference to... more
The paper presents modifications of full-field optical methods commonly used to test the surface quality of optical components used for forming a high power laser beam and tests of a final wavefront. The modifications in reference to surface measurements rely on implementation of the novel fringe pattern processing methods including the quality improvement of initial interferogram and analysis of a reconstructed phase based on Hilbert-Huang transform aided by the principal component analysis. Also the Point Diffraction Interferometer as the efficient tool for high quality measurements of elements with high NA is introduced. In reference to a wavefront quality measurements two solutions are discussed: the use of a lateral shear interferometer and the system employing Transport of Intensity Equation method. The pros and cons for both methods are discussed.
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ABSTRACT The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognized. The optical method of shape and movement determination is proposed for... more
ABSTRACT The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognized. The optical method of shape and movement determination is proposed for fast virtual object generation. A fringe pattern observed on the object surface is analyzed by spatial carrier phase shifting method. The analysis of fiducial points position during the measurements provides an information about object shifts within the measurement volume. Combined information about actual object shape and its displacement during the measurement enables to generate a virtual model of the object together with the description of its movement. The concept described above is experimentally tested and the exemplary result together with a short error analysis are presented. The further works to implement this technique are discussed.
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In the paper a new approach to quasi real-time phase reconstruction of digitally recorded holograms is presented. A new, low cost and fast measurement system based on digital holographic interferometry is described. Examples of... more
In the paper a new approach to quasi real-time phase reconstruction of digitally recorded holograms is presented. A new, low cost and fast measurement system based on digital holographic interferometry is described. Examples of experimental results representing deformations of an object under thermal load are shown.
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ABSTRACT The methodology and tools used recently in movement measurement for animation purposes are discussed here. It includes creating realistic 3D objects and describing the models of animation in 3D space. As a solution optical... more
ABSTRACT The methodology and tools used recently in movement measurement for animation purposes are discussed here. It includes creating realistic 3D objects and describing the models of animation in 3D space. As a solution optical methods using structured light are proposed for gathering the information about shape and out-of-plane deformation of 3D objects. The principle of movement monitoring and measurement by adaptive sinusoidal fit based method applied to variations of intensity in each pixel is described and discussed on the base of computer generated intensities. The concept described above is experimentally tested. The further works to implement this technique are discussed.
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In this paper we give an overview of the results obtained after benchmarking instrumentation tools for the characterization of micro-optics within the EC Network of Excellence on Micro-Optics NEMO. After a call within the NEMO network six... more
In this paper we give an overview of the results obtained after benchmarking instrumentation tools for the characterization of micro-optics within the EC Network of Excellence on Micro-Optics NEMO. After a call within the NEMO network six different partners decided to organize a round robin. In this paper we will give an overview of all the experimental values obtained in the 6 different round robins, then we will comment on these results by explaining the measurement differences and the uncertainties for all measurands.
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Recently surgery requires extensive support from imaging technologies in order to increase effectiveness and safety of operations. One of important tasks is to enhance visualisation of quasi-phase (transparent) 3D structures. In this... more
Recently surgery requires extensive support from imaging technologies in order to increase effectiveness and safety of operations. One of important tasks is to enhance visualisation of quasi-phase (transparent) 3D structures. In this paper authors present a few of practical hardware solutions using of operational stereoscopic microscope with two image acquisition channels, stereoscopic adapter and Helmet Mounted Display (HMD) for stereoscopic visualization of operational field "in real time". Special attention is paid to the development of opto- mechanical unit. The authors focus on searching cheap, accurate and ergonomic solutions. A few proposals are analyzed: typical stereoscopic adapter with two image acquisition channels equipped with developed software for image low contrast enhancement for stereoscopic observation in stereoscopic HMD of operational field, visual - picture adapter (real operational view through microscope channels or processed operational field images observation in "real time").
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The paper gives a review of interferometric tomography with focus on their necessary modification when applied to 3D refractive index determination in micro-objects. Specifically the influence of diffraction phenomenon and radial run-out... more
The paper gives a review of interferometric tomography with focus on their necessary modification when applied to 3D refractive index determination in micro-objects. Specifically the influence of diffraction phenomenon and radial run-out occurring during measurement are analyzed. The analysis is confirmed by results of measurements of 3D refractive index distribution in a multimode and single mode fibers. Additionally the discussion
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In the paper the experimental and numerical reconstruction of phase (waveguide and multimode fiber) and amplitude (microscopic glass plates with stickers glued on it) microobjects using digital holography setup is presented. The... more
In the paper the experimental and numerical reconstruction of phase (waveguide and multimode fiber) and amplitude (microscopic glass plates with stickers glued on it) microobjects using digital holography setup is presented. The measurement setup simulates the simplified arrangements for digital holographic tomography with two passes through the object. The experiment has proved the possibility of independent reconstruction of phase and
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ABSTRACT The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognized. The optical method of shape and movement determination is proposed for... more
ABSTRACT The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognized. The optical method of shape and movement determination is proposed for fast virtual object generation. Combination of fringe projection technique with photogrammetry is used to calculate the shape and position of the object points. The object surface during the measurement is illuminated by DMD projector and observed by two spatially separated CCD detectors. The time varying fringe pattern observed on the object surface is analyzed by spatial carrier phase shifting algorithm to determine the actual shape. The analysis of fiducial point's positions on two CCD detectors during the measurement provides an information about their points 3D co-ordinates within the measurement volume. Combined information about actual object shape and its position in time (as a rigid body motion) during the measurement enables to generate a virtual model of the object together with the description of its movement. The concept described above is experimentally tested and exemplary results of measurement of human body parts are presented. The brief error analysis is presented. The further works to implement this technique are discussed.
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This paper presents tomographic microinterferometry as a tool for determination of 3D refractive index distribution in optically transparent elements. Principles of method and exemplary results are obtained in laboratory system are given.... more
This paper presents tomographic microinterferometry as a tool for determination of 3D refractive index distribution in optically transparent elements. Principles of method and exemplary results are obtained in laboratory system are given. Concept of insensitive for ambient influence field tomograph dedicated for fast determination of refractive index distribution is given. Decreasing of acquisition and computing time is achieved by reduction
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ABSTRACT The creation of a virtual object for CAD/CAM and computer graphics on the base of data gathered by full-field optical measurement of 3D object is presented. The experimental co- ordinates are alternatively obtained by combined... more
ABSTRACT The creation of a virtual object for CAD/CAM and computer graphics on the base of data gathered by full-field optical measurement of 3D object is presented. The experimental co- ordinates are alternatively obtained by combined fringe projection/photogrammetry based system or fringe projection/virtual markers setup. The new and fully automatic procedure which process the cloud of measured points into triangular mesh accepted by CAD/CAM and computer graphics systems is presented. Its applicability for various classes of objects is tested including the error analysis of virtual objects generated. The usefulness of the method is proved by applying the virtual object in rapid prototyping system and in computer graphics environment.
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The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognised. Measured objects are classified into groups based on their mechanical properties... more
The basic methodologies used in animation are presented and their most significant problems connected with combining real and virtual worlds are recognised. Measured objects are classified into groups based on their mechanical properties and behaviour. The optical methods of shape and movement parameters determination adequate for fast virtual object generation are presented. Combination of various fringe projection techniques with photogrammetry
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