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    Wyświetlanie 1-9 z 9
    Tytuł:
    Numerical Analysis of Sensitivity of SAW Structure to the Effect of Toxic Gases
    Autorzy:
    Hejczyk, T.
    Pustelny, T.
    Wszołek, B.
    Jakubik, W.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/177695.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface acoustics wave SAW
    SAW
    Ingebrigtsen’s formula
    gas diffusion equations
    gaseous acoustic sensors
    numerical analyses of SAW structures
    Opis:
    The paper presents the results of numerical analysis of the SAW gas sensor in the steady and non-steady states. The effect of SAW velocity changes vs surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. The Knudsen’s model of gas diffusion was used. Numerical results for the effect of gas CH4 on layers: WO3, TiO2, NiO, SnO2 in the steady state and CH4 in the non-steady state in recovery step in the WO3 sensing layer have been shown. The main aim of the investigation was to study thin film interaction with target gases in the SAW sensor configuration based on simple reaction-diffusion equation. The results of the numerical analysis allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature, and layer type. The numerical results basing on the code elaborated numerical system (written in Python language), were analysed. The theoretical results were verified and confirmed experimentally.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 747-755
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Wituła, R.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201623.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SAW
    gas sensor
    piezoelectric substrate
    Ingebrigtsen's formula
    impedance transformation law
    numerical modeling
    Opis:
    The paper presents the results of numerical analyses of the SAW gas sensor in the steady and non-steady state. The effect of SAW velocity changes vs. the surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Knudsen's model of gas diffusion was used. Numerical results for the gases CH4, C2H4, C3H8, C6H6 in the steady state and CH4 in the non-steady state in the WO3 sensing layer have been shown. The results of numerical analyzes allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness and operating temperature. Some numerical results were verified in experimental studies concerning methane.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 589-595
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Optimization of Structures SAW Gas Sensors
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399352.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.25.Fe
    77.65.Dq
    68.35.Iv
    07.07.Df
    Opis:
    This paper presents the results of the analysis of surface acoustic waves sensor equivalent model. They were the sensor response of the surface acoustic waves sensor in the steady state gas: $H_2$, $CO_2$, $NO_2$, $NH_3$, $C_nH_m$, $CO$. Thin layer of $WO_3$ has been used as a sensor layer. Impedance replacement of sensor layer, taking into account the profile of the concentration of gas molecules in the layer, has been implemented into the equation of Ingebrigtsen, which enabled us to obtain analytical expressions for the relative changes in surface wave velocity in the steady state. The results of the analysis show that there is an optimum thickness of layer sensor for which an acoustoelectric effect (change in the acoustic wave velocity) is the highest.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 432-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semiconductor Sensor Layer in SAW Gas Sensors Configuration
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Jakubik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506792.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.Dq
    68.35.Iv
    07.07.Df
    Opis:
    A Rayleigh acoustic wave travelling on the surface of a semi-infinite piezoelectric medium may be changed by interaction with carriers and diffused gas in an adjacent semiconductor. The configuration, which uses a thin semiconductor film supported by a catalytic layer (Pd), is described in detail and the theoretical results of gas-sensor layer interaction are presented.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1153-1157
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Model of Semiconductor Sensor Layers in SAW Gas Sensors
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Jakubik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506790.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.Dq
    68.35.Iv
    07.07.Df
    Opis:
    In the paper a new theoretical model for analyzing a surface acoustic wave gas sensor is presented. Basing on the electric load of the piezoelectric acoustic line the effect of surface acoustic wave velocity changes vs. surface conductivity is predicted which depends on the profile concentration of gas molecules diffused into the porous film. Inside the sensor layer Knudsen's model of gas diffusion was used.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1148-1152
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $WO_3-Pd$ Structure in SAW Sensor for Hydrogen Detection
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493196.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.25.Fe
    77.65.Dq
    68.35.Iv
    07.07.Df
    Opis:
    In the paper a new sensor structure for surface acoustic wave gas system is presented. A bilayer structure $WO_3-Pd$ thin films may be useful for hydrogen detection in low concentration in air. A bilayer sensor structure of tungsten oxide $WO_3$ with a very thin catalytic film of palladium on the top has been studied for gas-sensing application at room temperature (about 25°C) in surface acoustic wave system. The bilayer structure of $WO_3$ layers with a thickness of about 50 nm, 100 nm and 150 nm was made onto a $LiNbO_3$ Y-cut Z-propagating substrate by means of the vacuum sublimation method using a special aluminum mask. The vapor source consisted of commercially available $WO_3$ powder (Fluka 99.9%) and molybdenum heater. The thin palladium (Pd) layer (about 10 nm) was made separately on each $WO_3$ layer by means of vapor deposition in high vacuum. There have been investigated three structures: 50 nm $WO_3$ + 10 nm Pd, 100 nm $WO_3$ + 10 nm Pd and 150 nm $WO_3$ + 10 nm Pd in three canal surface acoustic wave system with reference oscillator. Numerical results obtained by analysis of the surface acoustic wave gas sensor model have been compared with experimental results.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 616-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Results of Modeling Semiconductor Sensor Layers in SAW Gas Sensors
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Jakubik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506793.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.Dq
    68.35.Iv
    07.07.Df
    Opis:
    The paper presents the numerical results of investigations of the layered gas surface acoustic waves sensor. The base electric load of the piezoelectric acoustic line is predicted by the effect of surface acoustic waves velocity changes vs. surface conductivity, which depends on the profile concentration by gas diffused molecules into the porous film. Inside the sensor layer Knudsen's model of gas diffusion was used.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1158-1160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Non-Steady Stage in SAW Gas Sensors with Semiconducting Sensor Layers
    Autorzy:
    Urbańczyk, M.
    Hejczyk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493326.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.07.Df
    43.25.Fe
    68.35.Iv
    77.65.Dq
    Opis:
    The profile of the gas concentration in the sensor layer can be expressed as a polynomial function involving the diffusion coefficient $(D_{K})$, semiconductor film thickness (h), rate constant (k), gas concentration outside the semiconductor film $(C_{S})$. Before reaching a steady state of the concentration profile, its behavior depends on a few factors as the distance from the piezoelectric surface, the rate constant, the thickness of the layer and the diffusion constant and time. We are going to simulate temporary processes in the semiconductor sensor film in the surface acoustic wave gas sensor system and to describe the influence on relative changes of the surface acoustic wave velocity. The numerical results basing on the code written in Pyton, are described and analyzed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 789-793
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide
    Autorzy:
    Hejczyk, T.
    Urbańczyk, M.
    Pustelny, T.
    Jakubik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/176885.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas sensor
    carbon monoxide (CO)
    piezoelectric substrate
    numerical modeling
    surface acoustic waves
    acoustoelectric effects
    Ingebrigtsen's formula
    Opis:
    The paper presents the results of an analysis of gaseous sensors based on a surface acoustic wave (SAW) by means of the equivalent model theory. The applied theory analyzes the response of the SAW sensor in the steady state affected by carbon monoxide (CO) in air. A thin layer of WO3 has been used as a sensor layer. The acoustical replacing impedance of the sensor layer was used, which takes into account the profile of the concentration of gas molecules in the layer. Thanks to implementing the Ingebrigtsen equation, the authors determined analytical expressions for the relative changes of the velocity of the surface acoustic wave in the steady state. The results of the analysis have shown that there is an optimum thickness of the layer of CO sensor at which the acoustoelectric effect (manifested here as a change in the acoustic wave velocity) is at its highest. The theoretical results were verified and confirmed experimentally.
    Źródło:
    Archives of Acoustics; 2015, 40, 1; 19-24
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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