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Tytuł:
Fast optoelectronic sensor of water concentration
Autorzy:
Nowak, J. L.
Magryta, P.
Stacewicz, T.
Kumala, W.
Malinowski, S. P.
Powiązania:
https://bibliotekanauki.pl/articles/174478.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
humidity
hygrometer
laser spectroscopy
absorption
Opis:
A prototype optoelectronic hygrometer, based on absorption of laser light tuned to a specific rovibronic absorption line of H2O at 1364.68961 nm is described. Target application is meteorology, in particular precise and fast measurements of small-scale humidity fluctuations in turbulent atmospheric flows. Tests of the prototype instrument performed in the atmospheric boundary layer have proven the advantage of this optoelectronic sensor over typical, commercially available UV hygrometers designed for similar applications.
Źródło:
Optica Applicata; 2016, 46, 4; 607-618
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extension to the Rayleigh–Gans formula: model of partially absorbing particles
Autorzy:
Komar, L
Kocifaj, M
Kohut, I
Powiązania:
https://bibliotekanauki.pl/articles/173693.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
scattering
absorption
spherical particle
Rayleigh-Gans approximation
Opis:
The Rayleigh–Gans (R–G) approximation is widely employed in various optical models to simulate the optical response of transparent media. However, the R–G concept can only succeed if the refractive index of scatterers approaches that of surrounding medium. In addition, the sizes of scattering domains are assumed to be small enough. Because of these reasons, the validity of R–G solution is fairly limited. In this paper, a semi-analytical extension to the R–G theory is introduced, resulting in an approximate formula for efficiency factor for scattering Qsca. It is proven numerically that this formula works much better than that for traditional R–G model. The computations have been made on absorbing particles with sizes comparable to or smaller than the wavelength of an incident radiation. The conventional R–G theory is either inapplicable or at least inappropriate for such particles.
Źródło:
Optica Applicata; 2013, 43, 2; 313-323
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of cladding geometry on the absorption efficiency of double-clad fiber lasers
Autorzy:
Javadimanesh, M.
Ghavami, S. S.
Khorsandi, A.
Powiązania:
https://bibliotekanauki.pl/articles/173248.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
double-clad fiber
absorption efficiency
cladding geometry
Opis:
In the present work, the inner cladding geometries of a typical double-clad fiber laser are studied and numerically simulated for different cladding shapes to obtain the maximum absorption efficiency for the pump beam. This is performed by using the ray tracing approach and dislocating the fiber core from the center to impose the asymmetry on the investigated geometries. The high absorption efficiency of ~94.5% was obtained for the optimized offset D-shaped double-clad fiber. The hexagonal shape is proposed as a new geometry for the inner cladding to attain higher absorption efficiency. It was found that the absorption efficiency of ~68% for a symmetrical hexagonal can be improved to ~95% for an asymmetrized hexagonal-shaped double-clad fiber laser. Eventually the genetic algorithm was used to enhance the performance of the investigated geometries. This resulted in the further increasing of pump beam absorption efficiency of 99.5% in the genetic algorithm optimized asymmetrized hexagonal shape.
Źródło:
Optica Applicata; 2016, 46, 2; 277-289
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective infrared absorption and refraction of symmetrical two-layered molecular nanofilms
Autorzy:
Rodic, D
Skipina, B
Pelemis, S. S.
Jacimovski, S. K.
Setrajcic, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/174298.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanofilm
excitons
Green's functions
permittivity
absorption
refraction
Opis:
We have supplemented the already formulated microscopic theory of optical properties of very ultrathin molecular films (quantum nanofilms), i.e., quasi 2D systems parallel to XY planes bounded by two surfaces. The exposure of nanofilms to the external electromagnetic fields has resulted in the creation of excitons, but different than bulk ones in one direction perpendicular to surfaces. The analysis of the dielectric response of the system to perturbation of an external electromagnetic field shows that optical properties of these crystalline nanosystems for low exciton concentration of Frenkel’s excitons strongly depend on boundary parameters and the thickness of the film. In addition, the dynamical absorption and the refraction coefficient show a very narrow and discrete dependence of external electromagnetic field frequency, which is the consequence of both resonance and quantum size effects. Influences of boundary conditions on optical characteristics (through the analyses of dynamical absorption and refraction indices) of these nanostructures were specially and in details explored. The emission and the luminescence spectrum of the whole film have been analyzed and the results compared to experimental data show very good behavior and very good coordination.
Źródło:
Optica Applicata; 2013, 43, 4; 641-649
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a visible dual broadband nearly perfect absorber
Autorzy:
Jia, Xiuli
Powiązania:
https://bibliotekanauki.pl/articles/174436.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
metamaterials
visible absorber
polarization-independent
nearly perfect absorption
Opis:
Many optical systems benefit from elements that can absorb a broad range of wavelengths over a wide range of angles, independent of polarization. In this paper, we present a nearly perfect absorber with dual broadband and polarization-independent in the visible regime that exploits strong symmetric and asymmetric resonance modes of electromagnetic dipoles. It makes use of a bilayer hollowed-out cross pattern structure which is simple, having five layers that include two stacks of metal film with hollowed-out ribbon in cross patterns, two dielectric spacers, and a metal reflecting layer. Simulations show that the design exhibits a significantly enhanced absorption property when compared to a device with a normal cross pattern structure. The nearly perfect absorption efficiency of the device is above 98.5% at two resonances regimes: from 5.57 × 1014to 6.08 × 1014Hz and from 6.75 × 1014to 7.05 × 1014Hz, and its stable absorption characteristics can be maintained over a wide range of polarizing angle – up to ±90°. This strategy can, in principle, be applied to other material systems and could be useful in diverse applications, including thermal emitters, photovoltaics, and photodetectors.
Źródło:
Optica Applicata; 2019, 49, 1; 115-124
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide-angle infrared plasmonic perfect absorber based on graphene-silica grating
Autorzy:
Chen, Fang
Powiązania:
https://bibliotekanauki.pl/articles/1835755.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasmonic resonance
graphene grating
optical absorption
plasmonic absorber
Opis:
In this paper, wide-angle infrared perfect absorption has been demonstrated by using a double-layer graphene strip grating coupled with a silicon dioxide grating. Numerical simulation of the finite-difference time-domain method indicates that the perfect absorption can be achieved due to the effective impedance matching, and all the incident electromagnetic energy is confined in the Al2O3 layer between the silver substrate and the graphene strip grating. Dual-band perfect absorption is achieved with the change of strip width or chemical potential of the bi-layer graphene strip grating. It is found that the spectral position of the absorption peak can be tuned by the chemical potential or the width of the graphene strip, and additionally by the size of the proposed absorber. Moreover, the proposed perfect absorber shows excellent absorption stability for a wide range of the incident angle up to ±65°. The proposed absorber may find potential application in tunable double band perfect absorbers in the mid-infrared range.
Źródło:
Optica Applicata; 2021, 51, 1; 87-95
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on seawater scrubbing for SO2 removal from ships power plant exhaust gas
Autorzy:
Ma, Yiping
Xu, Leping
Su, Penghao
Feng, Daolun
Yang, Kailiang
Powiązania:
https://bibliotekanauki.pl/articles/207540.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sulfur dioxide
absorption
seawater
dwutlenek siarki
adsorpcja
woda morska
Opis:
The mechanism of SO2 absorption in seawater is investigated, and the experiment was carried out accordingly. Emphasis is on applications of seawater scrubbing of ship’s power plant exhaust gas containing SO2. The formulated model is used to predict the influence of various parameters on both pH of tailwater and seawater desulfurization capability, e.g., the partial pressure of SO2, the partial pressure of CO2, tailwater temperature, pH and alkalinity of seawater. Experiment results indicated that the seawater desulfurization capacity increases with both increasing partial pressure of SO2, pH and alkalinity and decreasing partial pressure of CO2 and temperature. The study shows the desulfurization capacity of seawater with 3.5% salinity is approximately twice that of freshwater. Different scenarios in which the required absorbent supply rate for a given SO2 removal efficiency are studied. It is observed a 97% removal efficiency, corresponding to meeting the SOx limits in the SOx emission control areas (SECA) while operating on a heavy fuel oil containing sulfur 3.5 wt. %, requires a minimum water supply rate of 0.0407–0.0683 m3/kWh, depending mainly on the water composition in terms of alkalinity and salinity. Such data are important in assessing the operation cost of the water scrubbing system.
Źródło:
Environment Protection Engineering; 2020, 46, 1; 31-47
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of dry grinding on physicochemical and surface properties of talc
Autorzy:
Arsoy, Z.
Ersoy, B.
Evcin, A.
Icduygu, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/109327.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
talc
grinding
contact angle
surface free energy
oil absorption
whiteness
Opis:
In this study the effect of dry grinding on hydrophobicity, surface free energy (SFE), particle size distribution, surface area, porosity, oil absorption, and whiteness of talc was investigated. The dry grinding was performed in a vibrating ball mill at various grinding times (5-150 min) by keeping the grinding parameters constant such as the number of ball, ball size, the amount of talc, vibration frequency and amplitude. Then, the contact angle measurements were performed on disc-shaped samples produced under a hydraulic press by using a sessile drop method with different liquids (water, formamide, diiodomethane, and ethylene glycol), and surface free energies (mJ/m2) were calculated according to OCG-AB (van Oss-Chaudhury-Good Acid-Base) method by using the obtained contact angle values. In addition, the physicochemical analyses given above were carried out for each ground sample. According to the obtained results, the water contact angle and SFE of the original sample were 63.800 and 48.70 mJ/m2, respectively. The lowest and highest contact angle values for the samples were obtained as 59.300 and 70.770 at grinding times for 5 and 15 min, respectively. It was also determined that the grinding time over 30 min showed no significant effect on the contact angle and SFE values of the samples. Similarly, the grinding time vs. SFE, and the grinding time vs. contact angle curves showed a similar trend. Parallel to the increase in the surface area upon the grinding, a small increase in the oil absorption and whiteness of talc was also determined.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 288-306
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of hybrid Ge QDs/Si nanowires solar cell with improvement in cell efficiency
Autorzy:
Olyaee, S.
Farhadipour, F.
Powiązania:
https://bibliotekanauki.pl/articles/173979.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanowire
absorption
FDTD
hybrid structure
thin-film
cylindrical quantum dots
Opis:
In this paper, the structure of a high-efficiency solar cell is presented by using a combination of quantum dots of germanium arrays and silicon nanowires on a thin film silicon layer. Due to the low absorption coefficient of silicon, this type of solar cell does not have high efficiency. According to the capability of the quantum structure in absorbing the incident photons and the generation of electron-hole pairs, this structure is proposed. Moreover, nanowires as an appropriate suggestion are applied in our work aiming to improve light scattering and optical photon absorption for the generation of carriers. Both of the electrical and optical characteristics of the solar cell are calculated by using a finite-difference time-domain method. Owing to the change of the nanowire length and increasing the number of quantum dot in our work, maximum power absorption is achieved. The achieved results provide a considerable improvement in efficiency and short-circuit current density. The efficiency is improved up to 17.5% and the short-circuit current density in the active layer of thickness 1170 nm has been provided to be 42.6 mA/cm2. The open circuit voltage for this cell is calculated to be 0.47 V. The achieved results provide a considerable improvement in efficiency and short-circuit current density in comparison with previously published method.
Źródło:
Optica Applicata; 2018, 48, 4; 633-645
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetrative convection due to absorption of radiation in a magnetic nanofluid saturated porous layer
Autorzy:
Mahajan, Amit
Sharma, Mahesh Kumar
Powiązania:
https://bibliotekanauki.pl/articles/178577.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic nanofluids
penetrative convection
Darcy model
radiation absorption
magnetic field
Opis:
The present study investigates the onset of penetrative convection induced by selective absorption of radiation in a magnetic nanofluid saturated porous medium. The influence of Brownian motion, thermophoresis, and magnetophoresis on magnetic nanofluid treatment is taken into consideration. The Darcy’s model is selected for the porous medium. We conduct a linear stability analysis to examine the onset of instability and evaluate the results for two different configurations, namely, when the layer is heated from below and when the layer is heated from above. The numerical investigations are carried out by applying the Chebyshev pseudospectral method. The effect of the porosity parameter E, parameter Y (represents the ratio of internal heating to boundary heating), Lewis number Le, concentration Rayleigh number Rn, Langevin parameter αL, width of nanofluid layer d, diffusivity ratio η, and modified diffusivity ratio NA is examined at the onset of convection. The results indicate that the convection commences easily with an increase in the value of Y, Le, and NA but opposite in the case with a decrease in the value of E, αL, η and d for both the two configurations. The parameter Rn advances the onset of convection when the layer is heated from below, while delays the onset of convection when the layer is heated from above.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 3; 129-142
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oszacowanie efektywnej sztywności i modułu sprężystości różnych gatunków drewna na podstawie pomiarów drgań swobodnych
The calculation of effective stiffness and elasticity modulus of different types of wood on the basis of measurements of free vibrations
Autorzy:
Misztal, B.
Powiązania:
https://bibliotekanauki.pl/articles/293843.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dynamika
częstość drgań
tłumienie
logarytmiczny dekrement tłumienia
efektywna sztywność
efektywny moduł sprężystości
dynamics
frequency of vibrations
absorption
logarithmic absorption decrement
effective stiffness
effective elasticity module
Opis:
W artykule opisano badania dynamiczne modeli z drewna sosnowego, świerkowego, modrzewiowego i dębowego. Badania przeprowadzono w celu oszacowania efektywnych sztywności Kef i Eef modułu sprężystości podłużnej różnych gatunków drewna. Przebieg drgań swobodnych każdego z modeli zilustrowano na wykresach. Pokazano różnice efektywnych modułów sprężystości drewna gatunków iglastych i liściastych. Oszacowane moduły sprężystości podłużnej Eef porównano z wartościami ujętymi w PN-B-03150:2000 Konstrukcje drewniane. Pokazano korzyści wynikające z krótkich testów dynamicznych do wyznaczania i porównywania właściwości drewna. Otrzymane w wyniku analizy drgań swobodnych obiektywne dane o właściwościach drewna można wprowadzić na bieżąco do projektowania i diagnostyki konstrukcji, uściślając wizualne umiejętności cieśli.
The paper presents dynamic tests of models made of pine wood, larch, and oak. The tests were conducted in order to calculate the effective stiffness Kef and Eef of the longitudinal elasticity modulus of different types of wood. The course of free vibrations of each of the models was illustrated in graphs and the differences in effective elasticity modules of softwoods and hardwoods were presented. The calculated longitudinal elasticity moduli Eef were compared with the values provided in the standard PN-B-03150:2000 Wood Constructions. The benefits of quick dynamic tests to determine and compare the qualities of wood were demonstrated. The objective results of the analysis of free vibrations regarding the qualities of wood can be used on a regular basis in designing and evaluating structures, adding to the visual capabilities of the carpenter.
Źródło:
Architectus; 2014, 1(37); 81-87
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Delayed differential detection for absorption spectroscopy recovery
Autorzy:
Cong, Menglong
Sun, Dandan
Powiązania:
https://bibliotekanauki.pl/articles/173211.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wavelength modulation spectroscopy
WMS
absorption
derivative spectrum
harmonic detection
laser diode
Opis:
An elaborately designed system has been devoted to the recovery of the line shape function of absorption spectrum. Laser power passing through trace gas has been divided into the real-time and delayed components, and their difference, i.e. the equivalent of the first-order derivative spectrum, is recorded and integrated to reconstruct the absorption line profile. Since the real-time and delayed signals are derived from the only gas cell and photodetector, the elimination of background is more effective, relative to the general used double beam detection that involves two gas cells and photodetectors. Compared with the 1st harmonic detection used in the wavelength modulation spectroscopy, here the generation of derivative spectrum is achieved without modulating the injection current of laser. Additionally, the expensive lock-in amplifier working for wavelength modulation spectroscopy is replaced by a homemade device, which is made of an all-pass filter and an instrumentation amplifier. Therefore, the complexity and cost are significantly reduced, and the stability is improved. For the purpose of validation, recovering of the absorption spectroscopy is carried out using a methane sample at its R(3) absorption line of the 2ν3 overtone, and the obtained data are found to be in a high agreement with theoretical deductions.
Źródło:
Optica Applicata; 2019, 49, 2; 303-315
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic properties of Er3+-doped fluorotellurite glasses modified by Nb2O5 and WO3
Autorzy:
Burtan-Gwizdała, Bożena
Reben, Manuela
Cisowski, Jan
El Sayed, Yousef
Lisiecki, Radosław
Grelowska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/174598.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorotellurite glasses
erbium ion
absorption
Judd-Ofelt analysis
photoluminescence
McCumber approach
Opis:
We have investigated the spectroscopic properties of Er3+-doped fluorotellurite glasses with the basic molar composition 75%TeO2–10%P2O5–10%ZnO–5%PbF2, modified by replacing 5% TeO2 by a metal oxide, namely WO3 or Nb2O5. The absorption edge of the glasses studied has been described within the Urbach approach, while the absorption and photoluminescence spectra have been analyzed in terms of the standard Judd–Ofelt theory, along with the photoluminescence decay of the 4I13/2 and 4S3/2 levels of the Er3+ ion. The absorption and emission spectra of the 4I15/2↔ 4I13/2infrared transition have been analyzed within the McCumber theory to yield the peak emission cross-section and figure of merit for the amplifier gain. It appears that the fluorotellurite glass containing WO3 as a modifier is characterized by the largest figure of merit, indicating this matrix as a promising new host for doping with Er3+ ions.
Źródło:
Optica Applicata; 2019, 49, 3; 393-402
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum interactions of optical radiation with the defect centres in the tails of the forbidden band of amorphous materials
Autorzy:
Mazinov, A
Shevchenko, A
Bahov, V
Powiązania:
https://bibliotekanauki.pl/articles/173375.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
resonant absorption centres
quantum interaction
semiconductor film
polycrystalline and amorphous silicon
Opis:
In this paper, the model approach that describes the quantum interaction of optical waves with the polycrystalline and amorphous semiconductor films is proposed. The absorption coefficient for active layers of semiconductor films is represented as the sum of pseudo-crystalline and amorphous components. Based on the proposed theoretical approach, we considered the long-wavelength optical absorption spectra of amorphous silicon in 1500–4000 cm–1 range. The resonant absorption centres were identified and were associated with V-V, I-V, V-V defect centres in a silicon gap with energies of 0.20–0.45 eV.
Źródło:
Optica Applicata; 2014, 44, 2; 327-335
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of the two-dimensional gas temperature distribution based on tunable diode laser absorption spectroscopy
Autorzy:
Shao, J
Wang, L
Ying, C
Powiązania:
https://bibliotekanauki.pl/articles/174322.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tomographic
modified adaptive algebraic reconstruction technique (MAART)
tunable diode laser absorption spectroscopy (TDLAS)
Opis:
Based on tunable diode laser absorption spectroscopy and modified adaptive algebraic reconstruction technique, two-dimensional tomographic reconstruction was derived for the gas temperature distribution in the range of 600–1400 K in the controlled projections. It is explicitly shown that the quality of temperature reconstruction is heavily dependent on the relative sensitivity of the selected spectrum and the algorithm of modified adaptive algebraic reconstruction technique but independent of the complexity of the present field distribution. When the relative sensitivity is less than 1.5, the accuracy of reconstruction relates to the relative sensitivity of the selected spectrum and improves with the increase in relative sensitivity. When the relative sensitivity is larger than 1.5, the accuracy is mainly limited by the algorithm of modified adaptive algebraic reconstruction technique.
Źródło:
Optica Applicata; 2015, 45, 2; 183-198
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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