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    Wyświetlanie 1-9 z 9
    Tytuł:
    Demonstration of a high extinction ratio TiN-based TM-pass waveguide polarizer
    Autorzy:
    Zhao, Zhuan
    Santi, Giovanni
    Corso, Alain Jody
    Pelizzo, Maria Guglielmina
    Powiązania:
    https://bibliotekanauki.pl/articles/2172856.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    plasmonic waveguide polarizer
    extinction ratio
    insertion loss
    broadband
    Opis:
    A high extinction ratio transverse magnetic (TM)-pass plasmonic waveguide polarizer has been designed and optimized. This device exploits two parallel TiN strips embedded in a silicon dioxide cladding to cut off the transverse electric (TE) polarization state, which is either reflected or absorbed, while the TM mode can pass through the main silicon waveguide with significant low losses. Given a device of 5 μm length, an extinction ratio as high as 60.7 dB and an insertion loss of 2.23 dB were achieved at the target wavelength of 1.55 μm. To our knowledge, this extinction ratio is one of the highest values ever reported. In the wavelength of 1.45–1.59 μm, the proposed device provides an optical bandwidth of 140 nm for an extinction ratio more than 30 dB and an insertion loss less than 3 dB. This device is relatively simple and is easier to be fabricated than other architectures that are found in the literature.
    Źródło:
    Optica Applicata; 2022, 52, 4; 585--598
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between the shape of substitution ducts and insertion loss of silencers
    Autorzy:
    Wójciak, Kamil
    Kopania, Joanna Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/2202426.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    silencer
    insertion loss
    aeroacoustics
    tłumik
    strata wtrąceniowa
    aeroakustyka
    Opis:
    Silencers are typical devices used for the reduction of noise in ventilation systems, which can be found in almost all industrial, service or residential installations. Determination of acoustic parameters for specific HVAC devices, like silencers, is within the scope of specialised laboratories. With the silencers, two main parameters should be taken care of: the first one is sound attenuation and the second one is pressure losses. In the presented paper, the focus is on measurement methods described by standard ISO 7235:2009. This standard specifies the methods for determining the sound power level of the flow noise generated by silencers, the total pressure of silencers and the insertion loss of silencers with and without airflow by using the substitute object. In this work, we focused on the correlation between the shape of the substitution duct and its acoustic parameters and its relation to this with the final result of insertion loss of a silencer.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022212
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Sound Insulation Through Double-Panel Structure by Using Hybrid Local Resonator Array
    Autorzy:
    Ri, Kyong-Su
    Kim, Myong-Jin
    Son-U, Se-Hyon
    Powiązania:
    https://bibliotekanauki.pl/articles/31339917.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sound insulation
    local resonance
    insertion loss
    sonic crystal
    Opis:
    In this paper, we present one approach to improve the soundproofing performance of the double-panel structure (DPS) in the entire audible frequencies, in which two kinds of local resonances, the breathing-type resonance and the Helmholtz resonance, are combined. The thin ring resonator row and slit-type resonator (Helmholtz resonator) row are inserted between two panels of DPS together. Overlapping of the band gaps due to the individual resonances gives a wide and high band gap of sound transmission in the low frequency range. At the same time, the Bragg-type band gap is created by the structural periodicity of the scatterers in the high audible frequency range. In addition, the number of scatterer rows and the filling factor are investigated with regard to the sound insulation of DPS with sonic crystals (SCs). Consequently, the hybrid SC has the potential of increasing the soundproofing performance of DPS in the audible frequency range above 1 kHz by about 15 dB on average compared to DPS filled only with glass wool between two panels, while decreasing the total thickness and mass compared to the counterparts with the other type of local resonant sonic crystal.
    Źródło:
    Archives of Acoustics; 2023, 48, 1; 63-70
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of the test facility for the measurement of noise silencers
    Autorzy:
    Bolejko, Romuald
    Plaskota, Przemysław
    Dobrucki, Andrzej B.
    Pruc, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/24201964.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    baffle silencers
    insertion loss
    flow noise
    tłumik przegrodowy
    strata wtrąceniowa
    hałas przepływu
    Opis:
    In the paper, a description of the test facility designed and implemented for noise silencers according to the methodology specified in the PN-EN ISO 7235 standard is presented. It is possible to measure the insertion loss, flow noise, and pressure loss on the test stand. In particular, the following issues were presented: noise protection in the low frequency range, the design of the anechoic termination, and measurements of the sound pressure level in the flow. To obtain a sufficiently high level of noise protection, three noise transmission paths were considered: direct, indirect, and flanking. The design of the anechoic termination was based on the profile of the catenoid tube, which made it possible to obtain strong sound absorption in the low-frequency range while maintaining a limited length of a terminator. A specially designed microphone cap was used to measure the sound pressure level in the flow field. The paper also presents results of selected measurements that illustrate the possibilities of the designed test stand.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022309
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study and prediction of insertion loss of acoustical enclosures
    Autorzy:
    Kosała, Krzysztof
    Majkut, Leszek
    Olszewski, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2146558.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    acoustical enclosures
    prediction of insertion loss
    sound transmission loss
    obudowy akustyczne
    predykcja tłumienności wtrąceniowej
    tłumienność przesyłania dźwięku
    Opis:
    The article presents the results of an experimental study and calculations, using theoretical models, of the insertion loss of acoustical enclosures. The research used a developed prototype stand for testing acoustical enclosures. The sound power levels of the source without and with the enclosure, needed to determine the insertion loss, were determined by the approximate method in accordance with standard requirements. To calculate of the insertion loss for enclosures with sound absorbing and insulating walls, a known calculation model using the transmission loss of baffles was used. A new calculation model for enclosures with sound insulating walls is proposed in the article.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020209
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The choice of suitable fitness function for optimization spurious elements of EMI filters
    Autorzy:
    Kejik, Z.
    Drinovsky, J.
    Ruzek, V.
    Zachar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/398116.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    tłumienność wtrąceniowa
    filtr EMI
    insertion loss
    EMI filter
    current compensated inductor
    spurious component
    participial swarm optimization
    Opis:
    In Introduction are introduced main problems of measurement of EMI filter and is suggested that creation of model of EMI filter is useful. In this paper is shown model of EMI filter which is based on basic circuitry of the EMI filter. Reduced equivalent circuitries for EMI filter and his creation are also shown, because these circuitries are more suitable for usage in iteration optimization loop. The spurious elements of filter are searched with optimization. Participial swarm optimization is used. Two possibilities of fitness function calculations are shown, too. Results of both approaches are compared in this paper. Using fitness function with weight coefficients gives better results and this fitness function is used for optimization of the measured characteristics.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 211-217
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of Different Types of Hearing Protectors Undergoing High-Level Impulse Noise
    Autorzy:
    Buck, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/90783.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    hearing protector
    impulse noise exposure
    test procedure
    damage risk criteria
    insertion loss measurement
    artificial head
    acoustic test fixture
    Opis:
    The paper describes the problems that may occur when hearing protectors, usually designed for industrial noise environments, are used for high-level impulse (weapon) noise. The military impulse noise environment is described, as are the different types of passive and active hearing protectors and the measurement procedures. The different mechanisms that may alter the effectiveness of the hearing protectors as well as their global efficiency when submitted to high-level impulse noise are presented. The paper also discusses how the performance values accessible to the user may be used in different damage risk criteria for continuous and impulse noise.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 2; 227-240
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface acoustic wave low insertion loss delay line for applications in sensors
    Linia opóźniająca z akustyczną falą powierzchniową o małej tłumienności wtrącenia do zastosowań w czujnikach
    Autorzy:
    Soluch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/192024.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    delay line
    insertion loss
    LiNbO3
    surface acoustic wave (SAW)
    linia opóźniająca
    tłumienność wtrącenia
    akustyczna fala powierzchniowa (AFP)
    Opis:
    It was shown that low insertion loss of a surface acoustic wave (SAW) delay line could be achieved when strong triple transit signals (TTS) are present. As an example, low insertion loss delay line on YZ LiNbO3, was developed. Double electrodes were used in interdigital transducers (IDTs) and in a screen. At a frequency of 62 MHz, insertion loss of about 8 dB, was obtained. Low insertion loss and narrow bandwidth make this SAW delay line attractive for applications in physical and gas sensors.
    Wykazano, że mała tłumienność wtrącenia linii opóźniającej z akustyczną falą powierzchniową (AFP) jest możliwa do uzyskania, gdy występuje silny sygnał trzeciego echa (STE). Jako przykład, opracowana została linia opóźniająca na podłożu YZ LiNbO3. W przetwornikach międzypalczastych i w ekranie zastosowano podwójne elektrody. Na częstotliwości 62 MHz uzyskano tłumienność wtrącenia około 8 dB. Mała tłumienność wtrącenia i wąskie pasmo czynią tę linię atrakcyjną do zastosowań w czujnikach fizycznych i gazowych.
    Źródło:
    Materiały Elektroniczne; 2016, T. 44, nr 1, 1; 4-6
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental tests of the acoustic properties of sound-absorbing linings and cores of layered baffles
    Autorzy:
    Kosała, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2146647.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    sound transmission loss
    sound absorption coefficient
    insertion loss
    baffles
    mineral wool
    izolacyjność akustyczna od dźwięków powietrznych
    współczynnik pochłaniania dźwięku
    tłumienie przepustowe
    przegrody
    wełna mineralna
    Opis:
    The article presents the results of research on the acoustic properties of materials used as sound-absorbing linings and cores in baffles of anti-noise protection. Using an impedance tube the spectral characteristics of the normal incidence sound absorption and sound transmission loss indices of 12 specimens of mineral wool with different density and thickness were determined. From these characteristics, the single-number weighted sound absorption coefficient αw and the sound reduction index Rw were calculated. To calculate the value of the Rw index on the basis of surface mass of the mineral wool specimen, a new formula was proposed. The insertion loss of an acoustic enclosure with one, two and three-layer walls with dimensions of 0.7×0.7 m, containing mineral wool, was determined. The best efficiency was achieved for the enclosure made of walls of layers: mineral wool, placed on the sound source side, steel plate and aluminium plate.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021107
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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