Optical Fibers and Their Applications最新文献

{"title":"Analysis of atherosclerotic lesions in the human body","authors":"N. Malinowska, Z. Domagała, S. Phang, Trevor M. Benson, E. Beres-Pawlik","doi":"10.1117/12.2566533","DOIUrl":"https://doi.org/10.1117/12.2566533","url":null,"abstract":"A very important problem in modern medicine is the identification of atherosclerotic lesions within human tubular vessels. Current methods such as OCT and intravascular ultrasonography are very expensive and do not provide conclusive information about the formation of atherosclerotic plaques, especially within the human thoracic aorta. This paper presents a new solution to the identification of atherosclerotic lesions based on a specially constructed endoscope that uses CCD cameras. The endoscope analyses the condition of the walls of the blood vessels (side analysis) and represents a step towards an in vivo investigation of part of the human body. The remaining problem is the exact identification of the places where changes occur in the human tubular vessels. Research using the fluorescence phenomenon gives a summary result from an area whose location can be determined with an accuracy of millimetres. For pipes with sufficiently large internal diameter CCD cameras can be used to produce images of the examined tissues. It is possible for doctors to use the images so obtained to identify diseased areas with high accuracy. An alternative approach for identifying atherosclerosis is to use a neural network method to analyse the received pictures. Popular methods such as Machine Learning and Deep Learning can also be used to identify features in medical images. Creating a ‘learning’ database of endoscopic images in which a doctor identifies regions of healthy and atherosclerotic tissue is time consuming. However, after creating the database, the image identification algorithm works much faster than known numerical methods. It can significantly contribute to improving the effectiveness of atherosclerosis diagnostics. This paper presents initial results that confirm the effectiveness of a Machine Learning approach in identifying atherosclerotic lesions from the analysis of endoscope images obtained with a black and white camera following fluorescence stimulation and with a colour CCD camera using white light illumination. These findings are important since histological tests are not possible in in vivo investigations.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123426410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New multicomponent titanate-germanate glasses and their luminescence properties","authors":"W. Pisarski, K. Kowalska, M. Kuwik, J. Pisarska, J. Dorosz, M. Kochanowicz, J. Zmojda, D. Dorosz","doi":"10.1117/12.2566324","DOIUrl":"https://doi.org/10.1117/12.2566324","url":null,"abstract":"New multicomponent titanate-germanate glasses were synthesized and their luminescence properties have been studied. The intense near-infrared luminescence bands are observed in titanate-germanate glass, which correspond to main laser transitions 4F3/2 → 4I11/2 (Nd3+), 4I13/2 → 4I15/2 (Er3+) and 5I7 → 5I8 (Ho3+) of rare earth ions. In particular, luminescence linewidths have been examined in relation to potential broadband near-infrared laser applications.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129728905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Jones-matrix mapping of polycrystalline networks of layers of main types of amino acids","authors":"V. Mishalov, A. Syvokorovskaya, V. Bachinskiy, Y. Sarkisova, A. Ushenko, O. Dubolazov, V. Ushenko, A. Motrich, M. Kalimoldayev, W. Wójcik, A. Smolarz, Zh. E. Amirgaliyeva","doi":"10.1117/12.2569783","DOIUrl":"https://doi.org/10.1117/12.2569783","url":null,"abstract":"The given data on the optical arrangement, in which the coordinate distributions of the real and imaginary component of the elements of the Jones matrix of optically thin polycrystalline layers are determined. Algorithms are presented and an experimental method for measuring the real and imaginary component of Jones-matrix images is analyzed. The experimental results of the study of statistical, correlation, and fractal parameters, which characterize the real component of the Jones-matrix image of polycrystalline networks of flat layers of the main types of human amino acids, are presented.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the minimum necessary order of a passive analog low-pass filter in VHF band using untunable SMD components","authors":"Egor Gurov, S. Uvaysova, S. Uvaysov, W. Wójcik","doi":"10.1117/12.2522416","DOIUrl":"https://doi.org/10.1117/12.2522416","url":null,"abstract":"This article contains a more accurate method for estimating the minimum necessary order of a passive low pass filter using untunnable SMD components. To design analog filters of the VHF band, parasitic effects can lead to appreciable differences in the experimental characteristics from the modeling results obtained by the AFC approximation method. An compensation attempt for the components selection may take a long time and require topology changes, for example, to increase order.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130680030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Offsetting and blending with perturbation functions","authors":"S. Vyatkin, O. Romanyuk, S. Pavlov, P. Popiel, Arman Abenov, Kalamkas Begaliyeva","doi":"10.1117/12.2522353","DOIUrl":"https://doi.org/10.1117/12.2522353","url":null,"abstract":"Free forms synthesized by means of the perturbation functions are proposed. the problem of mapping a two-dimensional texture array to curved surfaces defined by perturbation functions is considered. surface patterns are created by interactions between texture and surface. the synthesis a 2d and 3d texture array onto curvilinear surfaces is solved. For shape creating, we propose a set of algorithms and software based on function-defined surfaces that perform an interactive rate and enable intuitive operations.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132320607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A GPU-based multi-volume rendering for medicine","authors":"S. Vyatkin, O. Romanyuk, S. Pavlov, Larysa E. Nykiforova, T. Ławicki, G. Kashaganova, A. Oralbekova","doi":"10.1117/12.2522408","DOIUrl":"https://doi.org/10.1117/12.2522408","url":null,"abstract":"A GPU-based method of multi-volume rendering is described. the analytic results are supported by simulations of volume rendering on a number of scenes with function-based surfaces. our method supports a large number of volumes, complex translucent functional objects as well as constructive solid geometry intersections of volumes and function-based surfaces.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"64 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134412143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sign ambiguity of accumulated chromatic dispersion estimated from intensity waveforms in a fiber optic communications link","authors":"Z. Lach","doi":"10.1117/12.2522406","DOIUrl":"https://doi.org/10.1117/12.2522406","url":null,"abstract":"The paper discusses uncertainty in estimation of sign of accumulated chromatic dispersion in an optical fiber communication link where the estimation is based on fitting a model of chromatic dispersion affected optical intensity waveforms to intensity measurement data. The uncertainty is characterized by probability of false readout of accumulated chromatic dispersion sign. Through extensive computations it is shown that despite the sign estimation in the method in question is in general ambiguous the chance for erroneous readout can be engineered to a desired level provided certain conditions are met. For the purpose of the characterization a theoretical model of sign false readout was developed and validated through combined measurements and simulations.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126080783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wave formation on a liquid surface in cylindrical vessel under planar oscillation","authors":"V. Yeliseyev, T. Ruzova, A. Tolstopyat, L. Fleer, A. Shevchenko, S. Shevchenko, A. Kotyra, A. Abisheva, A. Tergeusizova","doi":"10.1117/12.2522412","DOIUrl":"https://doi.org/10.1117/12.2522412","url":null,"abstract":"The results of experimental and theoretical studies are presented for the case when the vessel with water performs periodic reciprocating and oscillatory movements. The problem was solved in the linear approximation using the potential equation. From the results of experiments and an analytical analysis of the problem it follows that the first resonance frequency of the oscillation of a liquid in a vessel plays an important role in the character of the motion. At the same time, bifurcation occurs in the region of resonant frequencies, i.e. transitions from the plane motion of the liquid to the rotational motion and vice versa.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116959718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the effect of hydrogenation of photosensitive fibres on the parameters of the periodic structures produced","authors":"J. Klimek, Gayni Karnakova, G. Yusupova","doi":"10.1117/12.2522370","DOIUrl":"https://doi.org/10.1117/12.2522370","url":null,"abstract":"An inscription of a Bragg grating on a typical telecommunications fibre is difficult to obtain. In inscribing a structure, special fibres with an increased germanium content or classic fibres subjected to the hydrogenation process are used. The following article analyses the dependence of the hydrogen pressure on the parameters of the structures produced, such as grating reflectivity, Bragg wavelength or full width at half maximum (FWHM). The article also verifies how the pressure in the hydrogenation process affects the time of inscribing structures. Two types of fibre were subjected to photosensitisation: the classic one and one with a higher content of germanium. The hydrogenation process was performed at three pressures of 50 bar, 100 bar and 190 bar. Hydrogenation took place under the ambient temperature conditions of the room in which the chamber was located.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123888565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UV polymerized microtips on multimode optical fibers","authors":"M. Chruściel, P. Marć, I. Jakubowska, L. Jaroszewicz","doi":"10.1117/12.2522113","DOIUrl":"https://doi.org/10.1117/12.2522113","url":null,"abstract":"The main aim of this paper is to present a geometry shaping of a polymer microtip manufactured on the end of different multi-mode optical fibers by using UV radiation. Used fabrication process is based on a photopolymerization where the microtip grows on one end of the optical fiber when light is launched to its other end. Two different types of the photopolymerizable mixtures and two typical multi-mode optical fibers with different core sizes and refractive index profiles were used for tested microtips. In order to assess their geometries scanning electron microscopy images were used. These images have showed that the influence on the microtip geometry has optical power and spectral characteristics of the UV light. The sensor’s transducer properties were evaluated on the basis of backscatter measurements when a refractive index of a surrounded medium of the microtip changes. Dynamic ranges of tested optical fibers with selected microtips have reached 25-28 dB for the gradient-index multi-mode optical fiber while for the step-index one were around 14 dB. Future research will be focused on increase of dynamic range for the sensor’s application and will be tested as micro-lens.","PeriodicalId":299297,"journal":{"name":"Optical Fibers and Their Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115992802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}