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Tytuł:
Optoelectronics systems for sniper detection
Optoelektroniczne systemy wykrywania strzelca wyborowego
Autorzy:
Kastek, M.
Dulski, R.
Trzaskawka, P.
Zygmunt, M.
Wojtanowski, J.
Kaszczuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/236092.pdf
Data publikacji:
2009
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
systemy detekcyjne
systemy optoelektryczne
systems detection
optoelectronics systems
Opis:
The paper presents modern sensor systems for sniper detection. Among such systems there are active and passive opto-electronic devices. Its primary advantage is the possibility to early recognize the threat, before the sniper is able to take the shot. Presented passive systems employ thermal cameras and advanced image processing algorithms to distinguish the sniper and muzzle blast signatures. Active systems, in turn, rely on the detection of laser radiation, retro reflected from pointed optics (optical sights and observation scopes). The paper presents basic technical and tactical characteristics of sniper detection devices, both standalone and included in multi-sensor detection systems.
W artykule przedstawiono współczesne systemy detekcyjne przeznaczone do wykrywania snajpera. Wśród systemów tego typu, wprowadzanych na uzbrojenie wielu armii istotną rolę pełnia pasywne i aktywne systemy optoelektroniczne. Ich zaletą jest możliwość wczesnej detekcji zagrożenia, zwłaszcza przed oddaniem strzału przez snajpera. Przedstawione systemy pasywne wykorzystują kamery termowizyjne i zaawansowane metody analizy obrazu w celu wykrycia sygnatur snajpera i strzału z broni palnej. Systemy aktywne wykorzystują z kolei promieniowanie laserowe w celu wykrycia optycznych przyrządów celowniczych i obserwacyjnych. W artykule przedstawiono charakterystyki techniczne i taktyczne szeregu urządzeń optoelektronicznych przeznaczonych do wykrywania snajpera, pracujących jako samodzielne urządzenia bądź jako elementy składowe \\ieloczujnikowych systemów detekcyjnych.
Źródło:
Problemy Techniki Uzbrojenia; 2009, R. 38, z. 109; 23-30
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a nanophotonic response descriptor
Autorzy:
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/1933940.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska
Tematy:
nanodevices
photonic response
optoelectronics
nanophotonics
Green's functions
Fredholm kernel
Opis:
The photonic response exhibited by typical semiconductor nanodevices is modeled through a notionally universal descriptor by virtue of the Green’s function associated with the generic complete, inhomogeneous differential equation. It is derived that the photoresponse evolution is expressible as the sum of saturation-limiting linear nanophotonic behavior and a linear superposition of eigenfunctions of the respective homogeneous Fredholm integral equation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2013, 17, 1-2; 91-94
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photonics and Web Engineering 2011
Autorzy:
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226302.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanomaterials
optical fibers
optoelectronics
photonics
measurement systems
optical communication systems
photonic sources and detectors
Opis:
The paper presents a digest of chosen technical work results shown by young researchers from different technical universities in this country during the SPIE-IEEE Wilga 2011 symposium on Photonics and Web Engineering. Topical tracks of the symposium embraced, among others, nanomaterials and nanotechnologies for photonics and telecom, sensory and nonlinear optical fibers, object oriented design of hardware, photonic metrology, optoelectronics and photonics applications, photonics-electronics co-design, optoelectronic and electronic systems for telecom, astronomy and high energy physics experiments, JET and pi-of-the sky experiments development. The symposium is an annual summary in the development of numerable Ph.D. theses carried out in this country in the area of advanced electronic and photonic systems. It is also an occasion for young researchers to meet together in a large group (under the patronage of IEEE) spanning the whole country with guests from this part of Europe. A digest of Wilga references is presented [1-92].
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 421-428
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MOVPE Technology of Fe-Compensated InP Layers for the Quantum Cascade Laser Applications
Autorzy:
Badura, Mikołaj
Powiązania:
https://bibliotekanauki.pl/articles/226294.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MOVPE technology
optoelectronics
quantum cascade lasers
epitaxy
Opis:
Quantum cascade laser is one of the most sophisticated semiconductor devices. Its technology requires extremely high precision and layers quality. Device performance is limited by thermal extraction form laser core. One of solutions is to apply highly resistivity epitaxial material acting as insulating layer on top of the QCL. Present work describes consequent steps of elaboration of MOVPE technology of Fe-compensated InP layers for further applications in quantum cascade lasers.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 389-394
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Communications, Multimedia, Ontology, Photonics and Internet Engineering 2012
Autorzy:
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226296.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonics
optical fibers
optoelectronics
communications
multimedia
cryptography
virtual worlds
ontology of information systems
Opis:
Wilga Symposium gathers two times a year, together around 300 young scientists active in advanced photonics, electronics and software systems, including Internet engineering. May 2012 marked a jubilee XXXth meeting in Wilga Resort. There were presented over 250 papers from nearly all technical universities in this country. The organizers present here a research survey of the WILGA Symposium work. Also a digest of chosen Wilga references is presented [1]-[39]. This paper is the second part of a concise review digest focused on optoelectronics, communications, multimedia and ontology of information technologies.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 463-478
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On negative differential mobility in nanophotonic device functionality
Autorzy:
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/1955299.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska
Tematy:
nanophotonics
two-dimensional electron gas
semiconductor-device nanointerface
negative differential mobility
optoelectronics nanotechnology
Opis:
The negative differential mobility (NDM) of two-dimensional carrier-gas against some proper external regulator allowing gradual controlled modification of the nanointerfacial environment tends to occur as interwoven with the nanophotonic device functionality. In this work, several instances from our two-decade principal research of both experimental observation and conceptual prediction concerning nanophotonics NDM are reconsidered towards outlining a global potential for the appearance of the effect.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2013, 17, 3-4; 131--137
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blue Optoelectronics in III-V Nitrides on Silicon
Autorzy:
Krost, A.
Dadgar, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035573.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Eq
62.20.Mk
81.15.Gh
81.40.Np
Opis:
Three simple and promising methods to grow high-quality, device-relevant gallium nitride heterostructures on silicon are presented: strain-compensation, patterning, and the insertion of low-temperature AlN interlayers. With all methods device-quality GaN can be grown. While patterning is especially interesting for light emitters, low-temperature AlN interlayers can be used universally not only for transistor structures, which require good insulation of the active layers to the Si substrate, but also for vertically contacted LEDs when doped with Si. Low-temperature AlN interlayers do not only reduce tensile stress but also improve GaN properties and strongly reduce the threading dislocation density from 10$\text{}^{10}$ cm$\text{}^{-2}$ to 10$\text{}^{9}$ cm$\text{}^{-2}$ for 2 low-temperature AlN layers. Additionally, the layer quality can be enhanced by using in situ Si$\text{}_{x}$N$\text{}_{y}$ masks. Best crack-free layers with dislocation densities around 10$\text{}^{9}$ cm$\text{}^{-2}$ show X-ray rocking-curve widths around 400 arcsec and narrow photoluminescence. So far, best LEDs on Si(111) have an optical output power of 0.42 mW at 20 mA and 498 nm which is enough for simple signal applications.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 555-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of optoelectronic sensor in application for armed vehicle staff safety and ergonomic improvement
Autorzy:
Mirosław, T.
Powiązania:
https://bibliotekanauki.pl/articles/245162.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
optoelectronics system
safety and ergonomic
camouflage
battle field robotisation
Opis:
The right information at the right time is crucial in task execution and survival on the battlefield. In the contemporary combat systems the optoelectronics system located in observational heads, periscopes etc. are responsible for providing adequate information for the vehicle commander, driver and gunner. The rapid development of photonic technologies and the process of battlefield robotisation make them become ubiquitous. Thanks to optoelectronics technology, the safety of the soldiers and their mental comfort can be based on not only the thickness of the armour plate, but also on active protection systems and the situational awareness. Systems of sensors installed on the accompanying vehicles -"drones" and ground platforms allow for early detection and location of threats. Remote-controlled unmanned armed systems are becoming increasingly popular and briefly will provide advanced fire units. Omnidirectional surveillance systems make transparent armour plate for the crew seeing what is happening around the vehicle. Countering observation and detection systems consisting of an active opponent camouflage -changing object signature This also applies optoelectronic circuits. In the article, the author presents the concept of surveillance systems and the construction of situational awareness and radio-electronic war with the use of optoelectronic systems and the problems that prevent the development of these systems in Poland. The aim of this article is to draw attention to the potential that these systems have. The author’s task is to underline the need of a long-term development program for these systems dedicated to Polish Land Forces.
Źródło:
Journal of KONES; 2015, 22, 1; 315-318
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Gain 2x2 Slotted Array Antenna for 5G Mobile Applications
Autorzy:
Haneef, Shaikh Rehan
Selvaperumal, Sathish Kumar
Jayapal, Vikneswary
Powiązania:
https://bibliotekanauki.pl/articles/226352.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technology
electronics
optoelectronics
photonics
telecommunications
signals circuits
systems
applications
Opis:
New optimized 2x2 slotted array antenna is designed using HFSS to operate at 28.1 GHz, using RT6010 substrate with height of 1.6 mm, tangent loss of 0.0023 and dielectric constant of 10.2 and overall dimension of 12x12 mm2, for 5G mobile applications. The 2x2 slotted linear array antenna achieved a high gain of 18.3 dB at 28.1 GHz with 10 dB bandwidth of 1.39 GHz, and with 83.21% of size reduction.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 4; 557-563
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porous Silicon Avalanche LEDs and their Applications in Optoelectronics and Information Displays
Autorzy:
Jaguiro, P.
Katsuba, P.
Lazarouk, S.
Smirnov, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047875.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Mb
78.60.Fi
85.60.Jb
85.60.Pg
Opis:
The use of silicon based light emitting diodes may completely solve the problem of low compatibility of optoelectronics elements and silicon chip. At present time the most suitable kinds of Si-LEDs are monocrystal and porous silicon avalanche LEDs. They have advantages such as long operation lifetime (>10000 hours), continuous spectrum, which allows to filter RGB colors, operation voltages (<12 V), extremely sharp voltage-current characteristic, nanosecond response time, and high high operation current densities (up to 8000 A/cm$\text{}^{2}$ in pulse mode). Rather low energy efficiency (<1%) is not so significant for near to eyes (NTE) microdisplays. These advantages open a way to design a high performance and cost effective passive addressed microdisplays.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1031-1036
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From High Electron Mobility GaN/AlGaN Heterostructures to Blue-Violet InGaN Laser Diodes. Perspectives of MBE for Nitride Optoelectronics
Autorzy:
Skierbiszewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/2043710.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Px
85.35.Be
42.60.By
73.21.Cd
Opis:
The recent progress in growth of nitride based semiconductor structures made by plasma assisted MBE is presented. This technology is ammonia free and nitrogen for growth is activated in RF plasma source from nitrogen molecules. The new growth mechanism - adlayer enhanced lateral diffusion of adatoms on semiconductor surface is studied in plasma assisted MBE. This mechanism enables us to achieve high quality step-flow epitaxy at temperatures 600-750ºC, much lower than expected from classical estimates based on the melting point of GaN. We show that growth at low temperatures in metal rich (gallium or indium) regime, together with use of low dislocation bulk GaN substrates, results in high quality of (In, Al, Ga)N layers and sharp interfaces. We demonstrate record high mobility of two-dimensional electron gas at GaN/AlGaN interface (with mobility exceeding 100 000 cm$\text{}^{2}$/(V s) at 4.2 K and 2500 cm$\text{}^{2}$/(V s) at 300 K) and report on first blue-violet InGaN multiquantum well laser diodes, operating in 407-422 nm wavelengths range. In this paper, we discuss also properties of strain compensated InAlN/InGaN multiquantum wells grown by plasma assisted MBE which are very attractive for telecommunication applications at 1.5μm wavelengths like electro-optical modulators or all-optical switches.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 635-651
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced photonic and electronic systems WILGA 2016
Autorzy:
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226058.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonic systems
electron technology
material engineering
electronics
photonics
optoelectronics
lasers
telecommunications
informatics
electronic systems
large research experiments
young researcher meetings
WILGA Symposium
Wilga
Opis:
Young Researchers Symposium WILGA on Photonics Applications and Web Engineering has been organized since 1998, two times a year. Subject area of the Wilga Symposium are advanced photonic and electronic systems in all aspects: theoretical, design and application, hardware and software, academic, scientific, research, development, commissioning and industrial, but also educational and development of research and technical staff. Each year, during the international Spring edition, the Wilga Symposium is attended by a few hundred young researchers, graduated M.Sc. students, Ph.D. students, young doctors, young research workers from the R&D institutions, universities, innovative firms, etc. Wilga, gathering through years the organization experience, has turned out to be a perfect relevant information exchange platform between young researchers from Poland with participation of international guests, all active in the research areas of electron and photon technologies, electronics, photonics, telecommunications, automation, robotics and information technology, but also technical physics. The paper summarizes the achievements of the 38th Spring Edition of 2016 WILGA Symposium, organized in Wilga Village Resort owned by Warsaw University of technology.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 3; 301-314
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Wireless Communications Operated at Long-Wave Infrared Radiation
Autorzy:
Mikolajczyk, Janusz
Szabra, Dariusz
Prokopiuk, Artur
Achtenberg, Krzysztof
Wojtas, Jacek
Bielecki, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/226104.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical wireless communication
free space optics
quantum cascade lasers
optoelectronics
telecommunications
Opis:
This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 383-387
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photonic integrated circuits - a new approach to laser technology
Autorzy:
Piramidowicz, R.
Stopiński, S.
Ławniczuk, K.
Welikow, K.
Szczepański, P.
Leijtens, X.
Smit, M.
Powiązania:
https://bibliotekanauki.pl/articles/201657.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
integrated optoelectronics
laser technology
photonic integrated circuits
indium phosphide
Opis:
In this work a brief review on photonic integrated circuits (PICs) is presented with a specific focus on integrated lasers and amplifiers. The work presents the history of development of the integration technology in photonics and its comparison to microelectronics. The major part of the review is focused on InP-based photonic integrated circuits, with a short description of the potential of the silicon technology. A completely new way of fabrication of PICs, called generic integration technology, is presented and discussed. The basic assumption of this approach is the very same as in the case of electronic circuits and states that a limited set of standard components, both active and passive, enables designing of a complex, multifunctional PIC of every type. As a result, functionally advanced, compact, energy efficient and cost-optimized photonic devices can be fabricated. The work presents also selected examples of active PICs like multiwavelength laser sources, discretely tunable lasers, WDM transmitters, ring lasers etc.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 683-689
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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