Papers by Małgorzata Kujawińska
Opto-Electronic Advances, Dec 31, 2022
A recent article in the Opto-Electronic Advances (OEA) journal from Prof. Qian Chen and Prof. Cha... more A recent article in the Opto-Electronic Advances (OEA) journal from Prof. Qian Chen and Prof. Chao Zuo's group introduced a new and efficient 3D imaging system that captures high-speed images using deep learning-enabled fringe projection profilometry (FPP). In this News & Views article, we explore potential avenues for future advancements, including expanding the measurement range through an extended number-theoretical approach, enhancing quality through the incorporation of horizontal fringes, and integrating data from other modalities to broaden the system's applications. Trusiak M, Kujawinska M. Deep learning enabled single-shot absolute phase recovery in high-speed composite fringe pattern profilometry of separated objects. Opto-Electron Adv 6, 230172 (2023).
Metrology and Measurement Systems, 2012
Spatial light modulators (SLM) are devices used to modulate amplitude, phase or polarization of a... more Spatial light modulators (SLM) are devices used to modulate amplitude, phase or polarization of a light wave in space and time. Current SLMs are based either on MEMS (micro-electro-mechanical system) or LCD (liquid crystal display) technology. Here we report on the parameters, trends in development and applications of phase SLMs based on liquid crystal on silicon (LCoS) technology. LCoS technology was developed for front and rear projection systems competing with AMLCD (active matrix LCD) and DMD (Digital Mirror Device) SLM. The reflective arrangement due to silicon backplane allows to put a high number of pixels in a small panel, keeping the fill-factor ratio high even for micron-sized pixels. For coherent photonics applications the most important type of LCoS SLM is a phase modulator. In the paper at first we describe the typical parameters of this device and the methods for its calibration. Later we present a review of applications of phase LCoS SLMs in imaging, metrology and beam manipulation, developed by the authors as well as known from the literature. These include active and adaptive interferometers, a smart holographic camera and holographic display, microscopy modified in illuminating and imaging paths and active sensors.
The paper presents the optical, mechanical, and electro-optical design of an interferometric insp... more The paper presents the optical, mechanical, and electro-optical design of an interferometric inspection system for massive parallel inspection of Micro-Electro-Mechanical-Systems (MEMS) and Micro-Opto-Electro-Mechanical-Systems (MOEMS). The basic idea is to adapt a micro-optical probing wafer to the M(O)EMS wafer under test. The probing wafer is exchangeable and contains a micro-optical interferometer array. A low coherent and a laser interferometer array are developed. Two interferometer designs are presented; a low coherent interferometer array based on a Mirau configuration and a laser interferometer array based on a Twyman-Green configuration. The smart-pixel approach for massive parallel electro-optical detection and data reduction is discussed. The mechanical design concentrates on the scanning system and the integration in a standard test station for micro-fabrication. First experimental results of a test scanning platform are presented. The overall control concept is described.
Social Science Research Network, 2022
In this work we present application of opto-numerical methodology for improvement of functional p... 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.
Optics and Lasers in Engineering, Dec 1, 2022
Proceedings of SPIE, Feb 5, 1993
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Scientific Reports, Nov 15, 2022
In this paper we present a structurally-complex biomimetic scattering structure, fabricated with ... more In this paper we present a structurally-complex biomimetic scattering structure, fabricated with twophoton polymerization, and utilize this object in order to benchmark a computational imaging system. The phantom allows to tailor the scattering by modifying its degrees of freedom i.e. refractive index contrast and scattering layer dimensions and incorporates a 3D imaging quality test, representing a single cell within tissue. While the sample may be used with multiple 3D microscopy techniques, we demonstrate the impact of scattering on three tomographic phase microscopy (TPM) reconstruction methods. One of these methods assumes the sample to be weak-scattering, while the other two take multiple scattering into account. The study is performed at two wavelengths (visible and nearinfrared), which serve as a scaling factor for the scattering phenomenon. We find that changing the wavelength from visible into near-infrared impacts the applicability of TPM reconstruction methods. As a result of reduced scattering in near-infrared region, the multiple-scattering-oriented techniques perform in fact worse than a method aimed for weak-scattering samples. This implies a necessity of selecting proper approach depending on sample's scattering characteristics even in case of subtle changes in the object-light interaction.
arXiv (Cornell University), Oct 21, 2020
Objective quality assessment of digital holograms has proven to be a challenging task. While pred... more Objective quality assessment of digital holograms has proven to be a challenging task. While prediction of perceptual quality of the recorded 3D content from the holographic wavefield is an open problem; perceptual quality assessment from content after rendering, requires a time-consuming rendering step and a multitude of possible viewports. In this research, we use 96 Fourier holograms of the recently released HoloDB database to evaluate the performance of wellknown and state-of-the-art image quality metrics on digital holograms. We compare the reference holograms with their distorted versions: (i) before rendering on the real and imaginary parts of the quantized complex-wavefield, (ii) after converting Fourier to Fresnel holograms, (iii) after rendering, on the quantized amplitude of the reconstructed data, and (iv) after subsequently removing speckle noise using a Wiener filter. For every experimental track, the quality metric predictions are compared to the Mean Opinion Scores (MOS) gathered on a 2D screen, light field display and a holographic display. Additionally, a statistical analysis of the results and a discussion on the performance of the metrics are presented. The tests demonstrate that while for each test track a few quality metrics present a highly correlated performance compared to the multiple sets of available MOS, none of them demonstrates a consistently high-performance across all four test-tracks.
Laser Interferometry IX: Applications, 1998
ABSTRACT
Engineering Failure Analysis, Nov 1, 2016
Abstract Although Digital Image Correlation (DIC) provides capabilities of scaling a field-of-vie... 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.
The results of quantitative, label-free measurements of SHSY-5Y cells under Low-Level Laser Thera... 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.
Proceedings of SPIE, Jun 3, 2002
ABSTRACT
Proceedings of SPIE, May 1, 2009
In digital holography, holograms are usually optically captured and then two-dimensional slices o... more In digital holography, holograms are usually optically captured and then two-dimensional slices of the reconstruction volume are reconstructed by computer and displayed on a two-dimensional display. When the recording is of a three-dimensional scene then such two-dimensional display becomes restrictive. We outline our progress on capturing larger ranges of perspectives of three-dimensional scenes, and our progress on four approaches to better visualise this three-dimensional information encoded in the digital holograms. The research has been performed within a European Commission funded research project dedicated the capture, processing, transmission, and display of real-world 3D and 4D scenes using digital holography.
Proceedings of SPIE, Dec 1, 1995
ABSTRACT Detailed investigations of the projection moire and grid projection methods used for the... 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.
ABSTRACT The principles of operation and optomechanical design of novel optical extensometer 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.
The 50th anniversary of Dennis Gabor’s Nobel prize (1971) and the upcoming 60th anniversary of th... 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 .
Welding Technology Review, Sep 10, 2015
Determination of residual stresses in metal coatings thermally sprayed on Al 2 O 3 substrate Dr h... more Determination of residual stresses in metal coatings thermally sprayed on Al 2 O 3 substrate Dr hab. inż. Dariusz Golański, prof PW; prof. dr hab. inż. Małgorzata Kujawińska; dr hab. inż. Tomasz Chmielewski, prof. PW; mgr inż. Grzegorz Dymny; dr inż. Jolanta Zimmerman-Politechnika Warszawska.
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Papers by Małgorzata Kujawińska