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Wyszukujesz frazę "Jaroszewicz, Leszek R." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Vibration sensing with the optical fibre Mach-Zehnder interferometer
    Autorzy:
    Kurzych, Anna T.
    Jaroszewicz, Leszek R.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315693.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    Mach-Zehnder interferometer
    vibration sensor
    optical fibre technology
    Opis:
    Vibration is a ubiquitous phenomenon that occurs in everyday life and people are exposed to it almost all the time. Most often, vibration is measured using electromechanical devices such as piezoelectric, piezoresistive, or capacitive accelerometers. However, attention should be paid to the limitations of such vibration sensors. They cannot operate in the presence of strong electromagnetic fields. Measurements with electromechanical devices require physical contact between the sensor and the vibrating object, which is not always possible due to the design of the sensor and device. The possibility of a non-contact vibration measurement in harsh environments is provided by the technology of interferometric fibre optic sensors. This paper reports the principle of operation, design aspects, experimentation, and performance of a Mach-Zehnder interferometric setup for the measurement of vibration frequency. There are different sensing arms implemented in the interferometer: single-mode, polarization-maintaining, and tapered optical fibre. The paper emphasises the simplicity of the set-up structure and the detection capabilities based on the interferometric sensing giving the possibility of constructing a commercial vibration sensor for all industry demands.
    Źródło:
    Opto-Electronics Review; 2023, 31, 4; art. no. e148992
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of transmission properties of a tapered optical fibre with gold nanoparticles liquid crystal composite cladding
    Autorzy:
    Moś, Joanna E.
    Stasiewicz, Karol A.
    Jaroszewicz, Leszek R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174851.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    tapered optical fibre
    liquid crystals
    liquid crystal composites
    nanoparticles
    optical sensor
    Opis:
    The article presents a study of a hybrid structure based on the combination of a tapered optical fibre and gold nanoparticles dispersed in a liquid crystal material. Sensitivity to changes of the refractive index of the environment in which the structure is located, as well as the possibility of changing the refractive index of liquid crystals by external factors, such as temperature and electric field, were investigated. Electro- and thermally-induced changes of the refractive index of a liquid crystal through the rotation of a molecule director, which cause changes in the light propagated in a tapered optical fibre, were described. The most important issue in the article is to determine the influence of doping a liquid crystal with gold nanoparticles the concentration of which varies between 0.1 and 0.3 wt.%. The paper presents transmission measurements in a wide optical range depending on voltage, temperature, and frequency changes. Additionally, time courses of the obtained signal were measured. The study shows that the appropriate selection of nanoparticle concentration has a huge impact on the optical wave propagation. The experimental results show that the optical changes obtained for the investigated hybrid structure prefer it for use as an electrooptical switcher, filter, or sensor.
    Źródło:
    Opto-Electronics Review; 2022, 30, 4; art. no. e143936
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards uniformity of rotational events recording : initial data from common test engaging more than 40 sensors including a wide number of fiber-optic rotational seismometers
    Autorzy:
    Kurzych, Anna
    Jaroszewicz, Leszek R.
    Dudek, Michał
    Sakowicz, Bartosz
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1818206.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    seismometer
    optical fiber interferometer
    recording
    rotational seismology
    Opis:
    Rotational seismology is one of the fastest developing fields of science nowadays with strongly recognized significance. Capability of monitoring rotational ground motions represents a crucial aspect of improving civil safety and efficiency of seismological data gathering. The correct sensing network selection is very important for reliable data acquisition. This paper presents initial data obtained during the international research study which has involved more than 40 various rotational sensors collected in one place. The key novelty of this experiment was the possibility to compare data gathered by completely different rotational sensors during artificially generated ground vibrations. Authors collected data by four interferometric optical fiber sensors, Fiber-Optic System for Rotational Events & Phenomena Monitoring (FOSREM), which are mobile rotational seismographs with a wide measuring range from 10⁻⁷ rad/s up to even few rad/s, sensitive only to the rotational component of the ground movement. Presented experimental results show that FOSREMs are competitive in rotational events recording compared with the state-of-the-art rotational sensors but their operation still should be improved.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 39--44
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixtures of selected n-alkanes and Au nanoparticels for optical fiber threshold temperature transducers
    Autorzy:
    Przybysz, N.
    Marć, Paweł
    Tomaszewska, E.
    Grobelny, Jarosław
    Jaroszewicz, Leszek R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818228.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    optical fiber sensors
    temperature treshold sensors
    gold nanoparticles
    n-alkanes
    photonic crystal transducers
    Opis:
    Thermo-optic properties enhancement of the bi-stable temperature threshold sensors based on a partially filled photonic crystal fiber was reported. Previously tested transducers filled with a selected group of pure n-alkanes had in most cases differences between switching ON and OFF states. Therefore, the modification of filling material by using additional crystallization centers in the form of gold nanoparticles was applied to minimize this undesirable effect. The evaluation of the thermodynamic properties of pentadecane and its mixtures with 14 nm spherical Au nanoparticles based on the differential scanning calorimetry measurements was presented. Optical properties analysis of sensors prepared with these mixtures has shown that they are bounded with refractive index changes of the filling material. Particular sensor switches ON before melting process begins and switches OFF before crystallization starts. Admixing next group of n-alkanes with these nanoparticles allows to design six sensors transducers which change ON and OFF states at the same temperature. Thus, the transducers with a wider temperature range for fiber-optic multi-threshold temperature sensor tests will be used.
    Źródło:
    Opto-Electronics Review; 2020, 28, 4; 220--228
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of rotational motion in a reinforced concrete frame construction by a fiber optic gyroscope
    Autorzy:
    Kurzych, Anna T.
    Jaroszewicz, Leszek R.
    Kowalski, J. K.
    Sakowicz, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/1818251.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    rotational seismology
    fiber-optic rotational seismometer
    civil engineering
    sensors
    Opis:
    This paper deals with an issue of a rotational motion impact on a construction and presents civil engineering applications of a fiber optic rotational seismograph named Fiber-Optic System for Rotational Events & Phenomena Monitoring. It has been designed for a long- term building monitoring and structural rotations’ recording. It is based on the Sagnac effect which enables to detect one-axis rotational motion in a direct way and without any reference system. It enables to detect a rotation component in the wide range of a signal amplitude from 10-8 rad/s to 10 rad/s, as well as a frequency from DC to 1000 Hz. Data presented in this paper show the behavior of a reinforced concrete frame construction on different floors. Several measurements were carried out by placing the applied sensor on different floor levels of a building. The laboratory and in-situ measurements confirmed that Fiber-Optic System for Rotational Events & Phenomena Monitoring is an accurate and suitable device for applications in civil engineering.
    Źródło:
    Opto-Electronics Review; 2020, 28, 2; 69--73
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A test performance of optical fibre sensors for real-time investigations of rotational seismic events: a case study in laboratory and field conditions
    Autorzy:
    Jaroszewicz, Leszek R.
    Dudek, Michał
    Kurzych, Anna T.
    Teisseyre, Krzysztof P
    Powiązania:
    https://bibliotekanauki.pl/articles/2063893.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    sagnac effect
    field tests
    rotational seismology
    fibre optic seismograph
    rotation rate
    signal analysis
    Opis:
    Preliminary results of laboratory and field tests of fibre optic rotational seismographs designed for rotational seismology are presented. In order to meet new directions of the research in this field, there is clearly a great need for suitable and extremely sensitive wideband sensors. The presented rotational seismographs based on the fibre optic gyroscopes show significant advantages over other sensor technologies when used in the seismological applications. Although the presented results are prepared for systems designed to record strong events expected by the so-called “engineering seismology”, the described system modification shows that it is possible to construct a device suitable for weak events monitoring expected by basic seismological research. The presented sensors are characterized, first and foremost, by a wide measuring range. They detect signals with amplitudes ranging from several dozen nrad/s up to even few rad/s and frequencies from 0.01 Hz to 100 Hz. The performed Allan variance analysis indicates the sensors main parameters: angle random walk in the range of 3 ∙ 10−8–2 ∙ 10−7 rad/s and bias instability in the range of 2 ∙ 10−9–2 ∙ 10−8 rad/s depending on the device. The results concerning the registration of rotational seismic events by the systems located in Książ Castle, Poland, as well as in the coalmine “Ignacy” in Rybnik, Poland were also presented and analysed.
    Źródło:
    Opto-Electronics Review; 2021, 29, 4; 213--219
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Liquid crystal optical devices for light beam modulation and processing
    Autorzy:
    Kłosowicz, Stanisław J.
    Jaroszewicz, Leszek R.
    Dąbrowski, Roman.
    Nowinowski-Kruszelnicki, Edward.
    Walczak, Andrzej.
    Powiązania:
    Biuletyn Wojskowej Akademii Technicznej 1999, nr 4, s. 75-86
    Data publikacji:
    1999
    Tematy:
    Optyka urządzenia
    Światłowody
    Modulatory światła ciekłokrystaliczne
    Opis:
    Ciekłokrystaliczne urządzenia optyczne do modulacji i obróbki wiązki świetlnej.
    Rys., tab.; Bibliogr.; Abstr., Rez., streszcz.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
      Wyświetlanie 1-9 z 9

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