Wyniki wyszukiwania - BazTech

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Komplementarne wykorzystanie metody elektrycznej i akustycznej do analizy modelowych źródeł wyładowań niezupełnych

Duda D., Maźniewski K., Szadkowski M.

Przegląd Elektrotechniczny

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2014

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R. 90, nr 10

129-132

PL

W artykule zaprezentowano wstępne wyniki badań wykonanych na modelowych źródłach wnz w celu ustalenia czy możliwe jest zwiększenie funkcjonalności metody emisji akustycznej (EA) tak aby uzyskiwać za jej pomocą informację o poziomie ładunku pozornego lub innego parametru mierzonego metodą elektryczną.

EN

The article presents the preliminary results of tests carried out on the modeled PD sources in order to determine whether it is possible to increase the functionality of the acoustic emission methods (AE) to obtain for its help information about the value of apparent charge or other parameter measured by electric method.

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Investigations on the Acoustoelectric Effect in Surface Acoustic Wave Gas Sensors (Saw) with Bi-Layer Sensor Structures

Jakubik W.

Molecular and Quantum Acoustics

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2005

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Vol. 26

105-113

EN

Bi-layer structures with two thicknesses of metal-free phthalocyanine ( ~120 and ~160 nm) but the same thickness of palladium (~20 nm), have been studied for hydrogen and carbon monoxide gas-sensing applications at ~30 °C and ~50 °C temperatures. The structures were fabricated in two different vacuum deposition processes (first the H2Pc film and followed by the Pd) onto a LiNbO3 Y-cut Zpropagating substrate for a SAW method. Additionally, using the same deposition techniques, the bi-layer structure was deposited onto a glass substrate with a planar microelectrode array for simultaneously monitoring of the planar resistance of the structure. A good correlation has been observed between these two methods; frequency changes for SAW method correlate with decreases of the bilayer structure resistance. These measurements can give information about the acousto-electric interactions between SAW and charge carriers in the bi-layer structure.

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Sensor Properties of Bilayer Structures with Palladium, Lead and Cobalt Phthalocyanines in Surface Acoustic Wave and Electric Systems

Jakubik W.

Molecular and Quantum Acoustics

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2004

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Vol. 25

141-152

EN

Presented here are the results concerning a hydrogen sensor based on a novel bilayer structure with lead and cobalt phthalocyanines in a Surface Acoustic Wave dual-delay line and electric systems. The sensor material consists of two layers produced in two different vapour deposition processes. The first one is a lead or cobalt phthalocyanine (~310nm PbPc or 200nm CoPc) layer, whereas the second is a ~20 nm thin palladium (Pd) film. This structure was simultaneously formed in a one of the SAW dual delay lines and on the interdigital electrodes of the glass substrate for electric measurements. These sensor structures have been investigated from the point of view their sensitivity towards: hydrogen, nitrogen dioxide and sulphur dioxide gases with different concentrations in dry air. Preliminary measurements of this two bilayer structures have been performed simultaneously in the same chamber for this same measurement conditions.

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Investigations of Polyaniline Thin Films as a Toxic Gas Sensors in Saw and Electric System - Preliminary Results

Urbańczyk M., Jakubik W., Maciak W., Stolarczyk A.

Molecular and Quantum Acoustics

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2004

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Vol. 25

235-242

EN

Presented here are the preliminary results concerning a polyaniline thin films investigations in a Surface Acoustic Wave dual-delay line and electric systems. The polyaniline films has been prepared by an open-boat, physical vapor deposition (PVD) process using chemically prepared polyaniline powder as starting material. These films were simultaneously formed in a one of the SAW dual delay lines and on the interdigital electrodes of the glass substrate for electric resistance measurements. The thickness of the polyaniline films was about 100 nm. These polyaniline films have been investigated from the point of view their sensitivity towards: nitrogen dioxide, sulphur dioxide, ammonia, H2S, carbon monoxide and hydrogen gases with different concentrations in dry air. Preliminary measurements of this two polyaniline films have been performed simultaneously in the same chamber for this same measurement conditions using an acoustic and electric methods.

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Hydrogen Sensor with Palladium and Metal-Free Phthalocyanine Bilayer Structures in Surface Phthalocyanine Bilayer Structures in Surface Acoustic Wave Attenaution on Ferrofluid

Jakubik W.

Molecular and Quantum Acoustics

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2003

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Vol. 24

81-87

EN

Presented here are the results concerning a hydrogen sensor based on a novel bilayer structure in a Surface Acoustic Wave dual-delay line and electric systems. The sensor material consists of two layers produced in two different vapour deposition processes. The first one is a metal-free pthalocyanine (H2Pc) layer, whereas the second is a ~20 nm thin palladium (Pd) film. This structure was simultaneously formed in a one of the SAW dual delay lines and on the interdigital electrodes of the glass substrate for electric measurements. In such a bilayer structure detection of hydrogen in a medium concentration range (from 1% to 4 % in nitrogen) is possible, even at room temperature. Preliminary measurements of this two bilayer structures has been performed simultaneously in the same chamber for this same measurements conditions. A good correlation of results between these structures has been observed.