Temat: 07.07.Df - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Methanol Vapor Sensing by Porous Silicon
Autorzy:: Yılmaz, O.
Kayahan, E.
Gören, F.
Dumludağ, F.
Tematy:: 07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1195231.pdf Link otwiera się w nowym oknie
Opis:: In this study, methanol vapor sensing of porous silicon was investigated. The porous silicon samples were anodized in HF based solution and rinsed with ethanol or deionized water after the anodisation. Porous silicon surface is very sensitive for methanol vapor sensing and the sensitivity affect from the rinsing procedure of porous silicon. The experimental results show that porous silicon is a promising candidate material for sensing methanol vapor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Porous Silicon Based Sensor for Organic Vapors
Autorzy:: Kayahan, E.
Bahsi, Z.
Oral, A.
Sezer, M.
Tematy:: 07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1193711.pdf Link otwiera się w nowym oknie
Opis:: Porous silicon (PS) has been an attractive material for enhancing optical properties of silicon. Its large surface area for sensor applications and compatibility with silicon-based technologies has been a driving force for further technology development. In this study, ability of PS to sense at room temperature organic vapors such as acetone, trichloroethylene and hexane, which are harmful to human health, has been investigated. Electrical (DC) and photo-luminescence (PL) measurements in a controlled atmosphere (nitrogen gas and an organic vapor mix) were performed to test the sensor response towards the organic vapors. It was found that PS surface is very sensitive against these vapors. The experimental results also suggested that PS can be used as a new electro-optical material to sense harmful vapors.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Porous Silicon Based Humidity Sensor
Autorzy:: Kayahan, E.
Tematy:: 07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1401435.pdf Link otwiera się w nowym oknie
Opis:: Porous silicon (PS) is well known as a photovoltaic material. However, in the last couple of years, research has focused on the use of porous silicon as chemical-biological sensors. This paper discusses the use of PS as an optical humidity sensor. Photo-luminescence (PL) quenching measurements in a controlled humidity atmosphere (mixed Nitrogen gas and water vapor) were performed to test the sensor response towards the water vapor. Surface morphologies of the PS samples were characterized by a scanning electron microscopy (SEM) and structural properties were investigated via Fourier Transform Infrared (FTIR) spectroscopy. It was found that PS surface is very sensitive to the water vapor. The experimental results suggested that PS surface is a promising candidate material to be used as a humidity sensor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Magnetic Fluxgate Sensor Characteristics Modeling Using Extended Preisach Model
Autorzy:: Frydrych, P.
Szewczyk, R.
Salach, J.
Tematy:: 75.60.-d
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1199497.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the implementation of the extended Preisach model for fluxgate sensor characteristics modeling. The developed model enables the optimization of fluxgate sensor parameters for a given core material. Model consists of two parts. The first one describes magnetic characteristics of the core, while the second part calculates output signal according to sensor dimensions and electric circuit parameters. The model is easy to adapt for modeling of other devices with magnetic cores. It can be used instead of costly and time consuming prototype testing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Analysis of the Responses of Metal-Oxide Semiconductor Nanostructures to Nitrogen Dioxide
Autorzy:: Procek, M.
Pustelny, T.
Tematy:: 82.47.Rs
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399393.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns analyses of the nanostructures based on metal-oxide semiconductors, such as titanium dioxide $(TiO_2)$ and zinc oxide $(ZnO)$ exposed to nitrogen dioxide $(NO_2)$ in an atmosphere of dry and humid synthetic air. The investigations were performed at a rather low temperature amounting to 120°C. The responses of sensors differing in the morphology of their structures have been compared. Also the time of their responses were compared with each other. The paper describes theoretically changes in the effective resistance of these structures due to the interaction of the gas. The presented results are being discussed based on the analysis of physical and chemical phenomena.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: MMI Structures Covered by Bromocresol Purple for Ammonia Detection
Autorzy:: Szewczuk, A.
Błahut, M.
Tematy:: 42.79.Gn
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399404.pdf Link otwiera się w nowym oknie
Opis:: In the paper examinations of a lightguide sensor on the base of gradient index multimode interference structures are presented. Investigated structures were fabricated in potassium-sodium ion exchange process. Multimode interference sensor was designed for ammonia detection. Bromocresol purple covering the multimode section was used as a sensing layer. Numerical calculations were performed with the use of modal analysis and beam propagation method to optimise sensor geometry and sensing layer thickness. Experimental results show the possibility of ammonia detection from the concentration of tens ppm.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Pattern Recognition Applied to Analysis of Gas Sensors Array Data
Autorzy:: Marczyński, P.
Szpakowski, A.
Tyszkiewicz, C.
Pustelny, T.
Tematy:: 02.50.Sk
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1418023.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Sensing Properties of Four-Layered Planar Waveguides - Theoretical Analysis
Autorzy:: Tyszkiewicz, C.
Tematy:: 42.79.Gn
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1418062.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Multivariate Analysis in Gas Sensing Applications
Autorzy:: Szpakowski, A.
Tyszkiewicz, C.
Pustelny, T.
Tematy:: 02.50.Sk
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811555.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: New Vision Sensor to Measure and Monitor Gas Pressure
Autorzy:: Murawski, K.
Tematy:: 06.30.Bp
07.05.Pj
07.07.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402303.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the construction and the use of a video sensor developed to measure air pressure. A characteristic feature of the device is pressure measurement based on digital image processing and self-diagnostics performed on the basis of an image. The paper presents the results of sensor calibration and measurements taken during the tests. It has been shown that the developed video-manometer model that is equipped with a flat diaphragm allows measuring the air pressure in the range of 0-100 mbar with an error less than 2%.
Dostawca treści:: Biblioteka Nauki

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