Temat: 43.35.Pt - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A New System for Acoustoelectronic Gas Sensors Analysis
Autorzy:: Jasek, K.
Miluski, W.
Pasternak, M.
Tematy:: 43.35.Pt
46.35.+z
68.35.Ja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399357.pdf Link otwiera się w nowym oknie
Opis:: Typical approach to the surface acoustic waves sensors response analysis is based on the use of self-oscillating circuits with surface acoustic wave device working inside positive feedback loop of an amplifier. Such kind of parametric measurement allows to track the center frequency of the sensor changes in particular. The method is widely used mainly due to their relative simplicity. Unfortunately, it has many disadvantages like frequency (phase) instability, sensitivity to unwanted factors, surface acoustic wave substrate mass-load limit etc. A new system to the analysis of surface acoustic wave gas sensors response as well as an exemplary measurement results are described in the paper. The presented system make the first step to the more complex conception realization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: New Approach to SAW Gas Sensors Array Response Measurement
Autorzy:: Jasek, K.
Miluski, W.
Pasternak, M.
Tematy:: 43.35.Pt
46.35.+z
68.35.Ja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493213.pdf Link otwiera się w nowym oknie
Opis:: Majority papers concerning surface acoustic wave sensors technology is devoted to the analysis of self-oscillating circuits with surface acoustic wave device and its basic frequency changes in particular. Such circuits are widely used mainly due to their relative simplicity. Unfortunately the price of the simplicity is such drawbacks like frequency instability, sensitivity to unwanted factors, surface acoustic wave surface load limit etc. A new approach to the analysis of surface acoustic wave gas sensors response is proposed in the paper. The approach significantly eliminates the disadvantages of commonly used so far methods of analysis.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: An Analytical Solution of Rayleigh Wave Propagation Problem on Elastic Substrate with Nonconductive Viscoelastic Layer
Autorzy:: Pasternak, M.
Tematy:: 43.35.Pt
46.35.+z
68.35.Ja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1807747.pdf Link otwiera się w nowym oknie
Opis:: The Rayleigh wave propagation problem in the elastic substrate-viscoelastic layer interface was analysed in the paper. The fundamental solution of the problem has been found in the Fourier-Laplace space using Biot viscoelastic solid model with Maxwell relaxation time. The space-time form of the solution was obtained using Cagniard-deHoop method. The solution presented in the paper seems to be applicable to surface acoustic waves gas sensors with polymeric (viscoelastic) layer.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: SAW Sensor for Mercury Vapour Detection
Autorzy:: Jasek, K.
Neffe, S.
Pasternak, M.
Tematy:: 43.35.Pt
46.35.+z
68.35.Ja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1417965.pdf Link otwiera się w nowym oknie
Opis:: Mercury is the element commonly applied in industry. Because of poisoning properties the monitoring of the mercury vapour concentration in the environment is very important. Mercury forms amalgams in connection with gold that causes a change in the electrical resistance and mass of the gold specimens. This effect was applied to measure mercury vapour concentration in the environment using surface acoustic wave technology. Two kinds of surface acoustic wave mercury sensors have been described in the paper. First one utilizes a thin film of gold deposited between aluminium interdigital transducers and reflectors of two-port surface acoustic wave resonator, and the second one golden interdigital transducers and reflectors without any sensitive film between them.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Influence of Humidity on SAW Sensor Response
Autorzy:: Jasek, K.
Pasternak, M.
Tematy:: 43.35.Pt
46.35.+z
68.35.Ja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399358.pdf Link otwiera się w nowym oknie
Opis:: In the surface acoustic wave sensors response analysis the influence of different factors on acoustic wave propagation velocity and resonant frequency of the surface acoustic wave device plays an important role. Because the resonant frequency is commonly assumed to be a sensor response, knowing the magnitude of this influence and its mechanisms is very important. The factors which interfere the most with the surface acoustic wave sensor response include: temperature, pressure, and humidity. The influence of humidity is almost impossible to eliminate because of phenomena connected with water adsorption at the surface of the substrate as well as the electrodes of the device.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Bilayer Structures of $NiO_{x}$ and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems
Autorzy:: Jakubik, W.
Urbańczyk, M.
Maciak, E.
Pustelny, T.
Tematy:: 43.25.Fe
77.65.Dq
43.35.Pt
68.35.Iv
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1795797.pdf Link otwiera się w nowym oknie
Opis:: A bilayer sensor structure of nickel oxide $NiO_x$ ( ≈ 60 nm) with a very thin film of palladium (Pd ≈ 18 nm) on the top, has been studied for gas-sensing application at relatively low temperatures of about 30°C and 60°C. The bilayer structure was obtained by rf sputtering and by vacuum deposition (first the $NiO_{x}$ and then the Pd film) onto a $LiNbO_{3}$ Y-cut Z-propagating substrate, making use of the surface acoustic wave method, and additionally (in the same technological processes) onto a glass substrate with a planar microelectrode array for simultaneous monitoring of the planar resistance of the layered structure. Such a bilayer structure was investigated in a low concentration range (from 50 ppm to 400 ppm in air) of nitrogen dioxide $(NO_{2})$, carbon monoxide (CO) and ammonia $(NH_{3})$ in a dry and wet air atmosphere and in a medium hydrogen concentration (1-2.5%) in dry air. The $NiO_{x}$ and Pd bilayer structure interact rather weakly with $NO_{2}$ molecules but with CO and $NH_{3}$ this interaction is much greater, especially at higher temperature ( ≈ 60°C). The hydrogen sensitivity is on the medium level, not exceeding 600 Hz (relative change in the differential frequency of ≈ 2.3%) at interaction temperature of 35°C.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: New Approach to Rayleigh Wave Propagation in the Elastic Halfspace - Viscoelastic Layer Interface
Autorzy:: Pasternak, M.
Tematy:: 43.35.Pt
68.35.Iv
43.20.Mv
46.35.+z; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811544.pdf Link otwiera się w nowym oknie
Opis:: The Rayleigh wave propagation problem in the elastic halfspace - viscoelastic layer interface was analysed in the paper. The problem was formulated in the Fourier-Laplace space using the Biot viscoelastic solid model. The characteristic equation has taken the Rayleigh equation form with correction term describing viscoelastic layer properties influence on the wave velocity. The approach presented here seems to be useful for surface acoustic waves gas sensors modelling because many chemisensitive coatings applied to the sensors exhibit viscoelastic properties.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 8.

Tytuł:: The Influence of External Pressure on Resonant Frequency of SAW Resonator
Autorzy:: Jasek, K.
Pasternak, M.
Tematy:: 02.60.-x
43.35.Pt
46.80.+j
61.30.Hn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1189910.pdf Link otwiera się w nowym oknie
Opis:: The results of numerical simulations and experimental measurements of surface acoustic wave resonator centre frequency and amplitude dependence on external pressure changes in the range 0-1 atm are presented in the paper. According to the analytical model as well as numerical calculations the pressure influence on the resonator centre frequency is linear. Unfortunately, in the real measurements the linearity is difficult to observe. Additional effects that modify the linear dependence of the centre frequency on pressure are caused by water particles. It is well visible especially in the low pressure range. The phenomenon can be applied for research of water contents in dry gases as well as construction of acoustoelectronic vacuometers.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Spoof Plasmons Affected by the Corrugated Structures
Autorzy:: Gric, T.
Tematy:: 43.35.Pt
42.70.Nq
61.82.Fk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032587.pdf Link otwiera się w nowym oknie
Opis:: As reported by Ritchie, the fundamental optical excitations that are confined to a metal/dielectric interface are referred as the surface plasmon polaritons. In the present study, we report on a theoretical investigation of the dispersion relation of surface plasmon polaritons on the periodically corrugated surfaces. Tunability of these structures can be enhanced further changing the employed material.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Surface Acoustic Wave Vibration Sensors for Linear Electronic Warning Systems
Autorzy:: Filipiak, J.
Solarz, L.
Steczko, G.
Tematy:: 43.25.Fe
77.65.Dq
43.35.Pt
68.35.Iv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1795794.pdf Link otwiera się w nowym oknie
Opis:: The topic of the paper is analysis of feasibility of surface acoustic wave vibration sensors for linear electronic warning systems. In linear warning systems localisation of the object is realised by pointing out the sensors which detect vibrations caused by the object. The information sent out by the detector enables identification of the sensor and its state. The sensor contains surface acoustic wave delay line in four-terminal network. The delay line is formed at the surface of piezoelectric plate. The vibrations of the plate are caused by vibrations of the medium surrounding the sensor. The frequency of the input signal is equal to the working frequency of delay line. The phase of the output signal is shifted in comparison with the input signal. The frequency of the phase shift would be equal to the resonance frequency of the sensor plate. The change of the output signal amplitude would be proportional to the amplitude of plate vibrations. The measured amplitude and frequency of the output signal would be registered by simple electronic devices. The measurements give us knowledge which sensor vibrates and the intensity of these vibrations. Such sensors enable construction of the electronic warning system.
Dostawca treści:: Biblioteka Nauki

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