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Wyszukujesz frazę "Tyszkiewicz, C." wg kryterium: Autor


Wyświetlanie 1-10 z 10
Tytuł:
Inverted Rib Waveguides - Theoretical Analysis of Sensing Properties
Autorzy:
Tyszkiewicz, C.
Powiązania:
https://bibliotekanauki.pl/articles/1399407.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
07.07.Df
Opis:
Optical waveguides are fundamental components of chemical and biochemical evanescent wave sensors. Presented work is devoted to theoretical investigations of homogeneous and surface sensitivity characteristics of the inverted rib waveguide structure. The inverted rib waveguide discussed in this paper is composed of an ion-exchange based channel waveguide formed in a glassy substrate and a uniform, high refractive index, sol-gel derived $SiO_2-TiO_2$ film. Characteristics of a homogeneous sensitivity, a surface sensitivity and fundamental modes sensitivity differences in function of a uniform film thickness and a maximal refractive index contrast of the gradient index channel waveguide are given. The influence of the $SiO_2-TiO_2$ film thickness on sensitivity characteristics is discussed. The analysis is carried out on a bases off the effective index method used with the transfer matrix method.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 582-585
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensing Properties of Four-Layered Planar Waveguides - Theoretical Analysis
Autorzy:
Tyszkiewicz, C.
Powiązania:
https://bibliotekanauki.pl/articles/1418062.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
07.07.Df
Opis:
Optical waveguides are the fundamental components of chemical and biochemical evanescent wave sensors. Presented work focuses on the theoretical investigations of homogeneous sensitivity of four-layered composite planar waveguide composed of a silica-titania film and a titania film deposited on a glassy substrate in order of citing. Characteristics of a homogeneous sensitivity and a fundamental modes homogeneous sensitivity difference of such a structure are compared with the ones for a three-layered waveguide composed of silica-titania waveguiding film. Therefore the influence of a high refractive index titania film on homogeneous sensitivity characteristics of three-layered structure is given. It was shown that homogeneous sensitivity difference of fundamental modes of four-layered waveguide can be optimized with respect to thicknesses of each layer. For each value of a cover refractive index there exists the minimal thickness of the titania layer which maximizes the homogeneous sensitivity difference of fundamental modes.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 908-914
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitive Films for Optical Detection of Ammonia and Nitrogen Dioxide
Autorzy:
Tyszkiewicz, C.
Karasiński, P.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418064.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
The sol-gel technology allows preparation of the thin silica films ranging in porosity from dense to highly porous. These films can function as matrix binding molecules of pH-sensitive indicators and can be utilized as sensitive coatings for intensity based planar evanescent wave chemical sensors. This paper is devoted to manufacturing technology and characterization of highly porous silica films deposited on soda-lime glass substrates, impregnated with bromocresole purple and cresole red. Two different methods of impregnation were used: dip coating, which entails sensitization of both silica films deposited on each side of a substrate and selective deposition of a dye solution on single side of the substrate. Manufactured sensitive films were tested toward influence of gaseous ammonia and nitrogen dioxide on their spectral characteristics of the absorption coefficient and the imaginary part of the refractive index. It was shown that bromocresole purple allows detection of both gases: $NH_3$ and $NO_2$.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 915-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties
Autorzy:
Karasiński, P.
Tyszkiewicz, C.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493230.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
The paper presents the results of the investigations involving the influence of the change of launching conditions on the characteristics of the planar amplitude evanescent wave ammonia sensors. Investigated sensors are based on the channel gradient waveguides, which are produced with the application of the ion exchange in glasses. In our investigations we have tested two sensor structures of different refractive index profiles. The absorption sensitive films were produced using sol-gel technology.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 651-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Sensing Supported by Pattern Recognition
Autorzy:
Tyszkiewicz, C.
Szpakowski, A.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1807758.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Sk
07.07.Df
84.35.+i
Opis:
The system composed of the array of eight semiconductor, chemoresistive gas sensors was used for the classification of hydrogen, methane and carbon oxide gaseous samples. The classification task was performed by pattern recognition methods applied to the multivariate response of the array. The pattern recognition scheme used for classification uses a feature subset selection algorithm coupled with an objective function designed for clustering and a multilayer perceptron classifier.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 419-421
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-Mode Rib Waveguides Fabricated by Means of Sol-Gel Method
Autorzy:
Karasiński, P.
Tyszkiewicz, C.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506795.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Et
81.20.Fw
07.07.Df
Opis:
Rib waveguides were fabricated with the use of selective, wet chemical etching of two-component waveguide films $SiO_2:TiO_2$ which were obtained using sol-gel method. Photoresist was applied as a mask in the process. The etching of the films $SiO_2:TiO_2$ was carried out in water solution of ammonia fluoride. The paper presents the results of theoretical analysis as well as the power distributions in the fabricated strip waveguides.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1168-1170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sol-Gel Derived Sensitive Films for Ammonia Sensors
Autorzy:
Tyszkiewicz, C.
Karasiński, P.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506869.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
The sol-gel technology allows the preparation of silica thin films ranging in porosity from dense to highly porous films (50%). Porous silica films can function as a matrix that is able to bind the molecules of pH-sensitive indicators and therefore can be utilized as a sensitive film in construction of intensity based fibre or planar optical sensors for ammonia detection. We report the fabrication and characterization of ammonia sensitive, highly porous silica films deposited on soda-lime glass plates and doped with the bromocresole purple, and bromothymol blue molecules. In this paper we present the influence of the substrate withdrawal speed from sol on a thickness and a refractive index of the undoped silica films, as well as spectral absorbance characteristics of the doped films. An influence of ammonia concentration in air and relative humidity on a transmission of produced sensitive films is also presented.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1262-1266
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multivariate Analysis in Gas Sensing Applications
Autorzy:
Szpakowski, A.
Tyszkiewicz, C.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1811555.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Sk
07.07.Df
Opis:
In gas sensing applications we often use sensors which have poor selectivity. Such sensors are mature, cheap devices with simple application circuits. Unfortunately, their cross sensitivity greatly restricts their usefulness when used in systems which employs univariate analysis. One method which allows to overcome this difficulty is utilization of multivariate analysis methods applied to the response from the group of such non-selective sensors. This work presents the multivariate, pattern recognition system utilized to process the response of an array of non-selective semiconductor sensors to obtain the qualitative information.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-239-A-242
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Żebrowe światłowody paskowe do zastosowań sensorowych
Rib channel waveguides for sensor applications
Autorzy:
Karasiński, P.
Rogoziński, R.
Tyszkiewicz, C.
Powiązania:
https://bibliotekanauki.pl/articles/155641.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
światłowód żebrowy
zol-żel
sprzęgacz kierunkowy
spektroskopia pola zanikającego
interferometr planarny
rib waveguide
sol-gel
directional coupler
evanescent wave spectroscopy
planar interferometer
Opis:
Zmiany efektywnych współczynników załamania w czujnikach światłowodowych pracujących w oparciu o spektroskopię pola zanikającego mierzone są z zastosowaniem sprzęgaczy siatkowych lub interferometrów. Podstawowym elementem interferometrów planarnych są światłowody paskowe. Przedstawiana praca dotyczy żebrowych światłowodów paskowych. Otrzymywane metodą zol-żel warstwy falowodowe SiO2:TiO2 są selektywnie maskowane z zastosowaniem tradycyjnej fotolitografii a następnie trawione chemicznie. W ten sposób zostały wytwarzane jednomodowe żebrowe światłowody paskowe i sprzęgacze kierunkowe. W pracy przedstawione są wyniki analizy teoretycznej światłowodów żebrowych i wyniki badań eksperymentalnych wytworzonych struktur.
Basic elements of planar interferometers are the channel waveguides. Presented work refers to the channel rib waveguides. In our previous work [7] we offered the production method of rib channel waveguides with the application of traditional photolithography and wet chemical etching of sol-gel derived silica-titania waveguide films. In this work we present new results of our research on rib waveguides and directional couplers. The theoretical analysis of rib waveguides was presented as well as the results of experimental investigations on the fabricated structures. The investigations on channel waveguides of the rib height of 5 nm was carried out for wavelengths: λ=677 nm. The waveguide films used in rib waveguides manufacturing technology are characterized by high refractive index (˜1.8) and ultra-low attenuation of 0.15 dB/cm. Rib waveguides of width w<4 Μm are monomode. For the rib waveguides we obtained the attenuation of (1.5š0.1) dB/cm. Rib waveguides of such an attenuation can be applied in the technology of integrated optics systems in sensor applications, and in particular for the construction of interferometers of Mach-Zehnder, Young or Michelson. The improvement of technology, and in particular the improvement in the quality of photolithographic masks should contribute to further decrease of attenuation of the produced rib waveguides.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 6, 6; 541-543
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pattern Recognition Applied to Analysis of Gas Sensors Array Data
Autorzy:
Marczyński, P.
Szpakowski, A.
Tyszkiewicz, C.
Pustelny, T.
Powiązania:
https://bibliotekanauki.pl/articles/1418023.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Sk
07.07.Df
Opis:
For an array of eight chemoresistive gas sensors a computer pattern recognition system was built. Multivariate data analysis was performed for measurements of three gases' dilutions: hydrogen $(H_2)$, methane $(CH_4)$, and carbon monoxide $(CO)$. The pattern recognition system included a feature subset selection algorithm involving PCA and objective function. Dimensionality reduction was applied to two kinds of patterns: three aforementioned gases and six different concentrations of hydrogen. For patterns of the three gases, classification tests were performed using k-NN algorithm and N-fold based validation method.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 847-849
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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