Wyniki wyszukiwania - BazTech

1

Using microwave refraction to determine local inhomogeneities of a rotating plasma

Martseniuk Yurii P., Siusko Yevhen V., Kovtun Yurii V.

Nukleonika

|

2023

|

Vol. 68, No. 1

19--24

EN

To determine the local inhomogeneities of a rotating plasma, the method based on microwave refraction was used. The method is based on spectral and correlation analysis of the refl ected signals from the rotating plasma layer at normal and inclined microwave incidence. This method allowed us to determine local inhomogeneities of plasma electron density, angles of azimuthal displacement of grooves, and its angular frequency of rotation. Using an additional 4th horn antenna, in contrast to previous works, it was possible to fi nd and analyze two regions with azimuthal inhomogeneities in the rotating plasma. Analysis of the refl ected signals shows the presence of four grooves, and the angular frequency of rotation  = 1.16 × 104 rad/s was also determined.

2

Intraoperative imaging based on common-path time-domain reflectometry for brain tumor surgery

Han Jae-Ho, Cha Jaepyeong

Optica Applicata

|

2020

|

Vol. 50, nr 2

223--227

EN

Minimally invasive intraoperative imaging plays a crucial role in delicate microsurgeries for precise operation monitoring in which fiber optic imaging can be considered as an endoscopy and surgical proximity guidance tool due to its compactness. This paper presents a near-infrared time-domain reflectometric common-path optical coherence tomography imaging technique using a bare-fiber probe mounted directly on a scanning galvanometer. The common-path setup allows the use of a freely adjustable optical path length and a disposable fiber probe, as well as eliminating the need for an additional dedicated reference optical path. Experimental results demonstrate clear discrimination between the brain tumor tissue and the normal tissue for mouse brains with the images acquired in real-time over a wide area. The proposed method enables real-time and in situ visualization of tumor resection for intraoperative imaging, and this study demonstrates the feasibility of its application to microsurgical interventions.

3

Coefficient of light reflection foreseen for chosen oils

Otremba Z.

Journal of KONES

|

2014

|

Vol. 21, No. 4

375--379

EN

Properties of oil substances manifest themselves by numerous physical, chemical and physicochemical parameters. Among various physical parameters (like temperature dependencies of the density or the friction coefficient), optical parameters can be underlined, namely: coefficient of light refraction and coefficient of light absorption, both as dependencies on the light wavelength. Those parameters are only primary optical characteristics of define substance, because in fact they constitute input data for example in the calculation other optical waveforms like light reflection coefficient (reflectivity), which can be useful in techniques in which oil plays any role. Reflectivity is a value in electrodynamics theory when the light is treated as an electromagnetic wave and can be derived from Maxwell equations for the plane wave which incidence the air-oil interface. The main assumption of this study is expectation that reflection of the light from the surface of define oil contain spectral information about features of oil. In this paper, there are presented spectral dependencies of reflectivity for the light which incidents the surfaces of various examples of oil, namely: crude oil Romashkino, lubricate oil Marinol, fuel oil L-1. Such information can help in the future in preparation the remote (touchless) method of detection the quality of define exploitive oil substance or changes of its properties.

4

The study of thermal connecting of telecommunication optical fibers (SiO2: GeO2) and EDF (SiO2: Al2O3, Er) fibers

Ratuszek M., Ratuszek M. J., Hejna J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2013

|

Vol. 61, nr 1

279-286

EN

This paper presents the research on optimization of the splicing process in the electric arc of telecommunication optical fibers and erbium doped EDF fibers. The results of the calculations of diffusion coefficients GeO2 in telecommunication optical fibers and diffusion coefficients Er and Al2O3 (together) in the fiber EDF are presented. Diffusion coefficients were determined for the fusion temperature in the electric arc ?2000°C, on the basis of changes, along the splice, of spliced thermoluminescence intensity profiles of the fibers. On the basis of knowledge of diffusion coefficients simulation calculation of loss joints of MC SMF fiber (Matched Cladding Single Mode Fiber - SiO2: GeO2) and NZDS SMF (Non Zero Dispersion Shifted - Single Mode Fiber - SiO2: GeO2) with EDF (Erbium Doped Fiber - SiO2: Al2O3, Er) was performed and presented as a function of diffusion time. Experimental studies of optimization of thermal connected MC SMF and NZDS SMF with EDF were presented and compared with theoretical results. This paper presents the results of microscopic observations of defects and diffusion, and X-ray microanalysis in the spliced areas of single-mode telecommunication optical fibers: MC SMF, NZDS-SMF and erbium doped active single mode optical fibers. Studies were performed with the use of the scanning electron microscope JSM5800LV and JSM6610A microscope equipped with EDS X-ray spectrometer. Results showing the influence of heating time on the diffusion of core dopants and the formation of deformations in the splice areas were presented.

5

Improvement of the TDR/TDT measurement using deconvolution technique in LabView

Leśnikowski J.

Przegląd Elektrotechniczny

|

2011

|

R. 87, nr 3

274-276

EN

TDR/TDT (time domain reflektometry/time domain transmission) technique is one of the most common method for evaluating a transmission lines, connectors etc. The paper is intended for users who want to create or improve a TDR/TDT system based, on the user-owned digital oscilloscope, pulse generator and popular LabView program. The paper presents a practical application of deconvolution technique used in TDR/TDT measurements. This technique is used to improve the overall resolution and accuracy of TDR/TDT measurement results. The first part of the paper presents a theoretical introduction to a deconvolution technique. The second part describes practical implementation of the deconvolution procedure using the popular measurement program Lab View. Finally, the application of the described deconvolution procedure, in the real system for the measurement of a new type of textile transmission lines applicable in Textronics, is presented.

PL

Metoda TDR/TDT (time domain reflektometry/time domain transmission) jest jedną z najczęściej używanych metod do pomiarów parametrów linii transmisyjnych, złączy w.cz. itd. Artykuł jest przewidziany dla osób które chcą stworzyć lub udoskonalić własny system do pomiarów reflektometrycznych oparty o generator impulsowy i oscyloskop cyfrowy. W artykule opisano praktyczne zastosowanie metody dekonwolucji używanej w pomiarach TDR/TDT. Metoda ta jest używana do poprawy rozdzielczości i dokładności wyników pomiaru. Pierwsza część artykułu zawiera wprowadzenie do teorii dekonwolucji. W drugiej części artykułu przedstawiono praktyczną implementację procedury dekonwolucji z wykorzystaniem populamego programu LabView. W końcu artykułu przedstawiono praktyczne zastosowanie opisanej procedury w rzeczywistym stanowisku do pomiarów nowego rodzaju tekstylnych linii transmisyjnych mających zastosowanie w Tekstronice.

6

Reflectometric measurements of thermally expanded core area

Ratuszek M., Zakrzewski Z., Majewski J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2010

|

Vol. 58, nr 4

513-517

EN

In this work an analysis method of one-way optical time domain reflectometer (OTDR) measurements has been presented. This method uniquely confirms mode field radii matching in diffusion transit area of the thermally expanded core (TEC) of thermally connected single mode telecommunication fibers. A comparison of reflectometric measurements with theoretical calculations of losses in TEC areas has been demonstrated.

7

Feasibility and challenges of DSL loop make-up identification via single-ended line tests

Neus C., Foubert W., Rolian Y., Maes J., Van Biesen L.

Metrology and Measurement Systems

|

2008

|

Vol. 15, nr 4

473-484

EN

Digital subscriber lines (DSL) offer the possibility to deliver broadband services over the existing telephone network. Yet, before deploying DSL, the subscriber loops must be tested to see if they can support high-speed data services, and at what rate. Single-ended automatic qualification is essential to achieve low-cost deployment of DSL, since it allows loops to be qualified in bulk without human intervention at the customer's location. An even more ambitious challenge is to fully characterize the loop, i.e. to identify its composition completely (number of loop sections, length and cable type of each section). This paper discusses the feasibility and the challenges of loop make-up identification via single-ended measurements.

8

Analysis of reflectometric measurements losses of spliced single mode telecommunication fibers with significantly different parameters

Ratuszek M.

Optica Applicata

|

2005

|

Vol. 35, nr 2

347-363

EN

In this paper there have been presented theoretical and basing on experiments analysis of one-way and two-way reflectometric measurements of spliced single mode telecommunication fibers with different refractive index profiles, received in various combinations of joints. In the analysis the dependence of one-way and two-way reflectometric measurements of splice loss on the mode field radii quotient and on the shift of axes of the spliced fibers as a function of measurement wavelength has been taken into account. On the basis of one-way reflectometric measurements a method explicitly proving the existence of a transient area in the spliced fibers has been presented.

9

Problemy wykorzystania fotometrycznej metody odbiciowej w badaniach struktury geometrycznej powierzchni obrobionej

Tyka A.

Zagadnienia Eksploatacji Maszyn

|

2002

|

Vol. 37, nr 3

125-133

PL

W referacie omówiono problemy przydatności fotometrycznej metody odbiciowej zastosowanej do nieniszczących badań struktury geometrycznej powierzchni obrobionej. Poruszono problem identyfikacji charakterystyk struktury geometrycznej powierzchni na podstawie analizy promieniowania odbitego od badanej powierzchni. Zamieszczono wyniki własnych badań z zastosowaniem zbudowanej aparatury badawczej. Dokonano krytycznej oceny uzyskanych wyników.

EN

The paper discuss the problem of usefulness of reflection photometric method for non-destructive testing of geometric structure of machined surface. The problem of identification of geometric structure on the base of analysis of radiation reflected from machined surface has been touched. Results of the original research works were enclosed. The critical discussion of the results of the tests was made.