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    Wyświetlanie 1-5 z 5
    Tytuł:
    Finite Element Analysis of SAW Sensor with ZnO Substrate for Dichloromethane (DCM) Gas Detection
    Autorzy:
    Moustafa, Mohamed
    Laouini, Ghaylen
    Alzoubi, Tariq
    Powiązania:
    https://bibliotekanauki.pl/articles/1945651.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    surface acoustic wave
    SAW
    gas sensors
    VOCs
    FEM modelling
    Opis:
    A SAW gas sensor based on Zinc Oxide (ZnO) piezoelectric substrate is simulated and evaluated for the detection of the dichloromethane (DCM) volatile organic compound (VOC). The study is performed based on the finite element method (FEM) using COMSOL Multiphysics software. The obtained device response using the ZnO substrate is compared to the one using the typical lithium niobate (LiNbO3) piezoelectric substrate. A thin film of polyisobutylene (PIB) membrane is selected to act as the sensing layer. The obtained results reveal a linear behaviour of the resonance frequency downshift (i.e., the sensor sensitivity) versus the investigated gas concentrations varying from 10 ppm to 100 ppm of DCM gas. Additionally, the sensor response is investigated by applying several thicknesses of PIB ranging from 0.3 µm to 1.0 µm. The observed sensor response shows less dependence on the PIB thickness using the ZnO substrate than the LiNbO3 one.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 419-426
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SAW Sensor with Langmuir-Blodgett Layer for Detection of Benzene and its Derivatives
    Autorzy:
    Balcerzak, Andrzej
    Kiełczyński, Piotr
    Szalewski, Marek
    Wieja, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1953516.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    SAW sensor
    Langmuir-Blodgett layer
    vapors
    benzene
    benzene derivatives
    Opis:
    Vapors of benzene and its derivatives are harmful and toxic for human beings and natural environment. Their detection has fundamental importance. For this purpose authors propose surface acoustic wave (SAW) sensor with skeletonized layer deposited by Langmuir-Blodgett (L-B) method. This layer was obtained by depositing a binary equimolar mixture of 5-[[1,3-dioxo-3-[4-(1-oxooctadecyl) phenyl]propyl]amino]-1,3-benzenedicarboxylic acid with cetylamine. The skeletonized sensor layer has been obtained by removing cetylamine. Response of this sensor depends mainly of the electrical dipole momentum of molecule. Among the tested compounds, benzene has a zero dipole moment and gives the smallest sensor response, and nitrobenzene has the largest dipole moment and the sensor reacts most strongly to its vapor.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 25-30
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Acoustoelectric Investigation of the New SAW Structure with (RR)-P3HT Polymer in DMMP Detection
    Autorzy:
    Hejczyk, Tomasz
    Wrotniak, Jarosław
    Magnuski, Mirosław
    Jakubik, Wiesław
    Powiązania:
    https://bibliotekanauki.pl/articles/1953456.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    gas sensor
    numerical modelling
    SAW gas sensor
    Ingebrigtsen’s formula
    DMMP
    (RR)-P3HT
    numerical acoustoelectric analysis
    NAA
    Opis:
    This document presents the results of numerical analyses of the SAW gas sensor in the steady state. The effect of SAW velocity changes depending on how the surface electrical conductivity of the sensing layer is predicted. The conductivity of roughness sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Numerical results for the gas DMMP (CAS Number 756-79-6) for layer (RR)-P3HT in the steady state are shown. The main aim of the investigations was to study the thin film interaction with target gases in the SAW sensor configuration based on diffusion equation for polymers. Numerical results for profile concentration in steady state are shown. The results of numerical acoustoelectric analysis (NAA) allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature and layer type. The numerical results based on the code written in Python, are described and analyzed. The theoretical results were verified and confirmed experimentally.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 313-322
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Physico-Chemical Properties of Submerged Arc Welding Fluxes on Pipeline Steel - A Brief Review
    Autorzy:
    Sharma, Lochan
    Chhibber, Rahul
    Powiązania:
    https://bibliotekanauki.pl/articles/27313869.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    pipeline steel
    submerged arc welding fluxes
    SAW
    physico-chemical properties
    structural integrity issue
    mechanical properties
    Opis:
    Pipeline welding is an integral part of oil and gas exploration industries. Often the welded joint failures were due to lack of weld quality, improper heat treatment and even poor workmanship. Further, the use of new material in pipeline industry puts focus on a better understanding of qualifying requirements of welding for reducing the failures in future. This necessitates the need for development and design of suitable welding fluxes for joining these materials. In this paper an attempt is made to study the effects of submerged arc welding fluxes on weldability as well as structural integrity issues in pipeline steels. Physicochemical and thermophysical properties of submerged arc fluxes widely affects the mechanical behaviour of pipeline steels. This paper presents an overview of the role of welding parameters, flux composition, cooling rate, slag behaviour and physicochemical properties of slag on final welded joint properties such as tensile strength, impact toughness etc. during submerged arc welding.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 409-421
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Saw System with the PANI + Nafion Sensing Structure for Detection of Low Concentration Carbon Monoxide
    Autorzy:
    Hejczyk, Tomasz
    Pustelny, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1953529.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Surface Acoustic Wave sensors
    carbon monoxide detection
    poisonous CO
    Opis:
    The paper presents a measuring system based on two resonators with a SAW acoustic surface wave. One of the resonators contains a sensor structure consisting of a Nafion layer with a PANI polyaniline nanolayer deposited on it. The sensor structure was tested for carbon monoxide, with a very low concentration (5, 10, 15, 20 ppm) in the atmosphere of synthetic air. The structure sensitivity was tested for two different PANI thicknesses: (100 and 180 nm). The tests were carried out for two different temperatures: 308 K and 315 K. The investigations shows that the measuring system used with the acoustic surface wave together with the proposed sensing layers is sensitive to the presence of low concentration carbon monoxide molecules in the atmosphere of synthetic air.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 681-686
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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