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Wyświetlanie 1-15 z 32
Tytuł:
Photobiological safety of the recently introduced energy efficient household lamps
Autorzy:
Necz, Péter P.
Bakos, József
Powiązania:
https://bibliotekanauki.pl/articles/2179018.pdf
Data publikacji:
2014-12-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
ultraviolet
visible light
blue light
optical radiation
hazard
Opis:
Objectives: Nowadays more and more newly introduced light sources (tungsten-halogen, compact fluorescent (CFL) and light-emitting diode (LED) lamps) are used in households. It is important to know whether their radiation poses any possible risk for human health or not. These light sources emit optical radiation not solely in the visible spectrum. Other bands emitted by these sources, i.e., ultraviolet and infrared, are potentially hazardous for human health. The visible light, especially the blue light, could also damage human retina. The purpose of this study was to determine the ultraviolet (UV) and blue light (BL) emissions from halogen bulbs, CFLs and LED lamps, and to evaluate them from the point of view of possible health risks for general public. Material and Methods: The exposure of UV and BL emissions from 19 types of CFLs, 11 types of halogen lamps and 4 types of LED lamps produced by different manufacturers were measured at 200 mm distance from the source. Results: The exposures to UV and BL were below the International Commission on Non-Ionizing Radiation Protection (ICNIRP) exposure limits in spite of the very conservative assumption of the assessment. Conclusions: Results of this study indicate that the UV and BL radiation from the newly introduced lamps does not exceed the current exposure limit values and thus, in comparison with the former incandescent bulbs, does not result in a higher risk for general public.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2014, 27, 6; 1036-1042
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different wavelengths of light on laccase, cellobiose dehydrogenase, and proteases produced by Cerrena unicolor, Pycnoporus sanguineus and Phlebia lindtneri
Autorzy:
Janusz, Grzegorz
Sulej, Justyna
Jaszek, Magdalena
Osińska-Jaroszuk, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1038799.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
white rot fungi
submerged cultures
visible light wavelenghts
Opis:
Three species of white rot fungi: Cerrena unicolor, Phlebia lindtneri and Pycnoporus sanguineus were cultured in two different media under five different lighting conditions: dark, white, red, blue, and green light. Laccase, cellobiose dehydrogenase, and protease activities were examined in the samples. Blue light efficiently boosted laccase synthesis in C. unicolor and P. sanguineus, whereas the highest activities (20 654 nkat/l) of P. lindtneri laccase were observed when this fungus was maintained in green light. On the contrary, the green light allowed obtaining the highest activities of cellobiose dehydrogenase of C. unicolor and P. lindtneri, while CDH of P. sanguineus seems to be dependent on white light. It is clearly visible that differences in protease activities are noticeable not only between the lights variants but also among the media used. However, high proteases activities are correlated with light variants inducing laccase in Lindeberg and Holm medium. Contrary to the cellulose-based medium, where they are weak in light variants that lead to high CDH activities.
Źródło:
Acta Biochimica Polonica; 2016, 63, 2; 223-228
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disinfection Properties of Conventional White LED Illumination and Their Potential Increase by Violet LEDs for Applications in Medical and Domestic Environments
Autorzy:
Buehler, Jule
Sommerfeld, Florian
Meurle, Tobias
Hoenes, Katharina
Hessling, Martin
Powiązania:
https://bibliotekanauki.pl/articles/2024030.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
antimicrobial
visible light
illumination
white
violet
LEDs
staphylococci
Opis:
The antimicrobial impact of visible violet and blue light has been known for more than a century but hardly been applied for purposeful pathogen reduction or prevention. The disinfecting properties of wide-spread warm-white and cool-white light emitting diodes (LEDs) are investigated by irradiation of staphylococci with different LEDs and varying doses. Additionally, the combination of a white and a violet LED illumination is examined. Both white LEDs exhibit an antimicrobial effect, which seems to be dominated by the blue parts of the LED emissions. Unfortunately, the antimicrobial effect is weak in realistic illumination applications. Additional violet LEDs can significantly enhance this impact without a large change in human color perception. This allows reasonable applications in certain medical and domestic environments without endangering humans.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 169-175
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Excellent Photocatalytic Performance of Iron-Carbon-Codoped Mesoporous Titania Nanocrystallines
Autorzy:
Zhang, Dongfang
Gao, Liang
Powiązania:
https://bibliotekanauki.pl/articles/1029986.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
titania
codoping
visible light
calcination temperature
photocatalytic mechanism
Opis:
Iron-carbon-codoped mesoporous titania nanocrystallines were synthesized by a modified sol-gel method based on the self-assembly technique using polyethylene glycol sorbitan monostearate (Tween 60) as template. The samples were characterized by X-ray diffraction, N_{2} adsorption, UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, electrochemical impedance spectroscopy, and transient photocurrent responses analysis. The photocatalytic activity of Fe-C-codoped TiO_{2} nanoparticles were evaluated by the degradation of methyl orange (MO), p-nitrophenol (PNP) and biphenol A (BPA) under visible light irradiation. It was found that the as-prepared Fe-C-codoped TiO_{2} sample showed excellent photocatalytic activity compared to undoped TiO_{2}. The highest activity was obtained for Fe-C-codoped TiO_{2} sample calcined at 520°. The enhanced photocatalytic performances were attributed to the synergetic effects of good crystallizing action, appropriate phase composition and slow recombination rate of photogenerated charge carriers. Based on the experimental results, a reasonable photocatalytic mechanism of as-prepared Fe-C-codoped TiO_{2} photocatalysts was also proposed and discussed.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1150-1159
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of visible light on the process of accelerated oxidation of dye contained in red paprika powder
Wpływ światła widzialnego na proces przyspieszonego utleniania barwnika zawartego w proszku z czerwonej papryki
Autorzy:
Ekielski, A.
Klepacka, A.M.
Mishra, P.K.
Shivani, Shivani
Powiązania:
https://bibliotekanauki.pl/articles/950817.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
visible light
accelerated oxidation
dye
red pepper
pepper powder
Opis:
Effect of visible light on the process of accelerated oxidation of dye contained in red paprika powder. The effect of temperature and visible light intensity on changes in ground paprika colour was investigated. In determination of changes in colour parameters there were used the colour space L*. a*, b*, the total colour change TCD and sample whiteness index WI. Investigations were carried out at three lighting intensity levels of D65 light (6000, 4500, 0 lx) at storage temperature (30º, 40º, 50ºC). The DOE model for investigation planning included in Statistica Program was used in investigations. The validation investigations were carried out to verify the model. Colour changes in the investigated samples were connected, first of all, with their lighting intensity and less so with storage temperature. A two-stage process of colour changes in the samples illuminated with the light of intensity 6000 lx was found. The carried out investigations can be used in predicting the time of changes in colour parameters of ground paprika exposed to intense radiation in the range of visible light.
Wpływ światła widzialnego na proces przyspieszonego utleniania barwnika zawartego w proszku z czerwonej papryki. W pracy badano wpływ temperatury i natężenia światła widzialnego na zmiany barwy mielonej papryki. Do określenia zmian parametrów barwy wykorzystano przestrzeń barw L*, a*, b* oraz całkowita zmianę barwy TCD, wskaźnik białości próbki WI. Badania przeprowadzono dla trzech poziomów intensywności oświetlenia światłem D65 (6000, 4500, 0 lx) w temperaturze przechowywania (30°, 40°, 50°C). W badaniach wykorzystano model planowania badań DOE zawarty w Programie Statistica. W celu weryfikacji modelu przeprowadzono badania walidacyjne. Zmiany barwy badanych próbek były związane przede wszystkim z intensywnością ich oświetlania, w mniejszym stopniu z temperaturą przechowywania. Zaobserwowano dwuetapowy proces zmiany barwy dla próbek oświetlonych światłem intensywności 6000 lx. Przeprowadzone badania mogą być wykorzystane do przewidywania czasu zmian parametrów barwy zmielonej papryki wystawionej na działanie intensywnego promieniowania w zakresie światła widzialnego.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 61 Agric.Forest Eng.
0208-5712
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facile Synthesis and Characterization of Novel CdS/BiOI Heterojunctions with Enhanced Visible-Light Photocatalytic Performances
Autorzy:
Fang, Shanshan
Lu, Min
Zhou, Man
Li, Zhongyu
Xu, Song
Peng, Yanyan
Li, Qinchi
Lu, Dayong
Powiązania:
https://bibliotekanauki.pl/articles/1030343.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
CdS/BiOI heterojunctions
visible-light photocatalyst
photocatalytic activity
nanocomposites
Opis:
Novel CdS/BiOI heterojunction photocatalysts were successfully prepared by facile method. The as-prepared samples were characterized by transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, the Raman spectroscopy, UV-vis diffuse reflectance spectra, the Fourier transform infrared spectra, and photoluminescence. It was found that CdS nanoparticles were uniformly distributed on the surface of BiOI microspheres. The photodegradation tests showed that the photocatalytic efficiency was increased at first and then decreased when further increasing CdS content in the nanocomposites. The highest activity was obtained by 3%-CdS/BiOI nanocomposites. The enhanced photocatalytic performances were attributed to the matched band potentials of CdS and BiOI, which resulted in the efficient separation of photogenerated electron-hole pairs. Based on the experimental results, a reasonable photocatalytic mechanism of CdS/BiOI photocatalysts was also proposed.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 263-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel (Ag,Y) doped TiO2 plasmonic photocatalyst with enhanced photocatalytic activity under visible light
Autorzy:
Kallel, Wannes
Chaabene, Sirine
Bouattour, Soraa
Powiązania:
https://bibliotekanauki.pl/articles/110853.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
titanium dioxide
XRD
plasmonic photocatalyst
Methylene Blue
visible light
Opis:
Nano-sized Y- Ag doped and co-doped TiO2 particles were synthesized using the sol–gel method and Ti(OBu)4 as TiO2 precursor. Their structural and optical properties were examined by scanning electron microscopy (SEM), XRD, thermogravimetric-differential thermal analysis (TG-DTA), FT-IR and UV-vis absorption spectroscopies. The photocatalytic activity of these materials was investigated for the photodegradation of methylene blue (MB) as a model reaction under visible light irradiation. Ground state diffuse reflectance absorption studies reveal that both Y and Ag dopant cause deviations of the band gap to higher energies attesting that co-doping the TiO2 with Y and Ag could enhance the photocatalytic activity by delaying the electron–hole recombination by means of higher energy band gaps. Co-doping TiO2 at a level of 4% (Y, Ag) samples leads to a significant decrease in the crystallite size of photocatalyst and containing both anatase and Ag/AgCl components. However, the high photocatalytic performance is attributed to an efficient electron-hole pairs separation at the photocatalyst interfaces in addition to localized surface plasmon resonance of Ag particles. The development of these visible light- activated nanocatalysts has the potential of providing environmentally benign routes for water treatment.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 745-759
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Code Family for QS-CDMA Visible Light Communication Systems
Autorzy:
Addad, M.
Djebbari, A.
Powiązania:
https://bibliotekanauki.pl/articles/308553.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
CDMA
visible light communications
zero correlation zone
zero cross correlation
Opis:
Visible light communication (VLC) is a promising technology for wireless communication networks. Optical code division multiple access (OCDMA) is a strong candidate for VLC-based applications. The predominant source of bit error in OCDMA is the multiple access interference (MAI). To eliminate MAI in synchronous OCDMA, zero cross correlation (ZCC) codes have been proposed. However, synchronization problems and multipath propagation introduce relative non-zero time delays. Therefore, the zero correlation zone (ZCZ) concept was introduced. In this paper, we propose a new method for generating ZCC codes. The proposed construction can accommodate any number of users with flexible Hamming weight. The numerical results obtained show that the proposed codes significantly reduce MAI, compared to ZCC, as well as ZCZ codes.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 5-8
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing Gausian and exact models of malicious interference in VLC systems
Autorzy:
Blinowski, Grzegorz
Mościcki, Adam
Powiązania:
https://bibliotekanauki.pl/articles/225996.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
visible light communication networks
network security
physical layer security
transmission jamming
Opis:
Visible Light Communication (VLC) is a technique for high-speed, low-cost wireless data transmission based on LED luminaries. Wireless LAN environments are a major application of VLC. In these environments, VLC is used in place of traditional systems such as Wi-Fi. Because of the physical characteristics of visible light, VLC is considered to be superior to traditional radio-based communication in terms of security. However, as in all wireless systems, the security of VLC with respect to eavesdropping, signal jamming and modification must be analyzed. This paper focuses on the aspect of jamming in VLC networks. In environments where multiple VLC transmitters are used, there is the possibility that one or more transmitters will be hostile (or "rogue"). This leads to communication disruption, and in some cases, the hijacking of the legitimate data stream. In this paper we present the theoretical system model that is used in simulations to evaluate various rogue transmission scenarios in a typical indoor enviro.The typical approach used so far in jamming analysis assumes that all disruptive transmissions may be modeled as Gaussian noise, but this assumption may be too simplistic. We analyze and compare two models of VLC jamming: the simplified Gaussian and the exact model, where the full characteristics of the interfering signal are taken into account. Our aim is to determine which methodology is adequate for studying signal jamming in VLC systems.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 277-286
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174839.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid PAPR reduction schemes for different OFDM-based VLC systems
Autorzy:
El-Ganiny, Mohamed Y.
Khalaf, Ashraf A. M.
Hussein, Aziza I.
Hamed, Hesham F. A.
Powiązania:
https://bibliotekanauki.pl/articles/2174840.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
peak-to-average power ratio
bit error rate
Opis:
Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.
Źródło:
Opto-Electronics Review; 2022, 30, 3; art. no. e141951
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
Autorzy:
Mohammed, Nazmi A.
Elnabawy, M. M.
Khalaf, Ashraf A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1818212.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
light emitting diode
peak-to-average power ratio
bit error rate
Opis:
Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
Źródło:
Opto-Electronics Review; 2021, 29, 2; 59--70
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
Autorzy:
Mohammed, N. A.
Elnabawy, M. M.
Khalaf, A. A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1818214.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
light emitting diode
peak-to-average power ratio
bit error rate
Opis:
Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
Źródło:
Opto-Electronics Review; 2021, 29, 2; 59--70
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PAPR reduction using a combination between precoding and non-liner companding techniques for ACO-OFDM-based VLC systems
Autorzy:
Mohammed, N. A.
Elnabawy, M. M.
Khalaf, A. A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1818217.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
light emitting diode
peak-to-average power ratio
bit error rate
Opis:
Peak-to-average power ratio reduction techniques for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. The proposed techniques are based on merging non-linear companding techniques with precoding techniques. This work aims to nominate an optimum novel scheme combining the low peak-to-average power ratio with the acceptable bit error rate performance. Asymmetrically clipped optical orthogonal frequency division multiplexing with the low peak-to-average power ratio performance becomes more attractive to real-life visible light communication applications due to non-linearity elimination. The proposed schemes are compared and an optimum choice is nominated. Comparing the presented work and related literature reviews for peak-to-average power ratio reduction techniques are held to ensure the proposed schemes validity and effectiveness.
Źródło:
Opto-Electronics Review; 2021, 29, 2; 59--70
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and performance evaluation of vehicular visible light communication system under different weather conditions and system parameters
Autorzy:
El-Mokadem, Eslam S.
Tawfik, Nagwan I.
Aly, Moustafa H.
El-Deeb, Walid S.
Powiązania:
https://bibliotekanauki.pl/articles/2204173.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
visible light communication
beam divergence
bit error rate
vehicular communication
laser diode
Opis:
Vehicular visible light communication is an emerging technology that allows wireless communication between vehicles or between vehicles and infrastructure. In this paper, a vehicular visible light communication system is designed using a non-return to zero on-off keying modulation scheme under the effect of different weather conditions such as clear, haze, and fog. The first model is a light emitting diode-based system and the second is a laser diode-based system. For both models, the influence of system parameters such as beam divergence, transceiver aperture diameters, and receiver responsivity is studied. The impact of the use of the trans-impedance amplifier is also investigated for both models. It was concluded that in the presence of the amplifier, output power of the light emitting diode and laser diode model are increased by 98.46 μW and 0.4719 W, respectively. The performance of the two proposed models is evaluated through bit error rate, quality factor, eye diagram, and output power to have some insightful results about the quality of service for the two proposed models. Under a specific weather condition, the performance of the system would be critical and other techniques should be applied. The maximum achievable link distance for the laser-based and light-emitting diode-based systems is 190 m at a data rate of 25 Gbps and 80 m at a data rate of 60 kbps, respectively, under the same system parameters and weather conditions. The obtained results provide a full idea about the availability of constructing our proposed model in a practical environment, showing a higher performance of the laser diode-based model than that of the light emitting diode-based model.
Źródło:
Opto-Electronics Review; 2023, 31, 2; art. no. e145580
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
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