Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userlaboratory evaluation of wavelength laser changes in communication free space optical underwater (FSOUW)
تقييم مخبري لتأثير طول موجة الليزر في الاتصالات تحت الماء.
669
0 0
0.0
(
0
)
Added by
Damascus University رسالة ماجستير
Publication date
2020
fields
Physics
and research's language is
العربية
Created by
Saeed Maroof
Ask ChatGPT about the research
ملخص الاطروحة تم في هذا البحث العمل دراسة الدور الذي يلعبه الليزر في الأنظمة غير الموجهة في النظم اللاسلكية تحت الماء (FSOUW) والتي تحدد الاختيار العملي لمكونات المنظومة الليزرية في الأنظمة غير الموجهة، ودراسة أثر امتصاص مياه البحار والمحيطات لأشعة الليزر وارتباطها مع طول موجة الليزر. وقد استخدمت ثلاثة أطوال موجية (445، 532، 650) نانومتر لتقييم صحة اختيار قناة المياه المناسبة مع 100 مل واط من الليزر كطاقه مرسله. وقد فحصت SNR و BER و SERتبعاً لخمس قنوات مائية مختلفة. هذه هي مياه الصنبور الصافية، ومع ملح، ثم تم إضافة تراكيز مختلفة من مالوكس (Mg(OH)2 and Al(OH)3) والملح من أجل الحصول على المياه عالية التعكر، وتظهر النتائج أن محتوى المالوكس Mallox والملح يقلل من الطاقة المستقبلة للإشارة الليزرية ويسبب قطع الاتصال . وتم رسم الخطوط البيانية المتعلقة بتغير طول الموجة مع معامل الامتصاص لها في المخبر لعدة أطوال موجية وعدة أنواع من مياه المحيطات وتم مناقشة النتائج.
Summary of the thesis In this research, the work examined the role that lasers play in unguided systems in underwater wireless systems (FSOUW), which determine the practical choice of laser system components in unguided systems, and examine the impact of the absorption of sea and ocean water to lasers and their association with laser wavelength. Three wavelengths (445, 532, 650) nm have been used to assess the validity of the selection of the appropriate water channel with 100 ml watts of laser as its transmitter energy. SNR, BER and SER were examined following five different water channels. These are pure tap water, and with salt, various concentrations of Malox (MG(OH)2 and Al (OH)3) and salt have been added in order to get high-turbid water, and the results show that mallox and salt content reduces the energy receiving the laser signal and causes disconnection. The charts on wavelength change were drawn with their absorption coefficient in the laboratory for several wavelengths and several types of ocean water and the results were discussed.
Artificial intelligence review:
Research summary
تتناول هذه الرسالة تأثير طول موجة الليزر على الاتصالات تحت الماء، حيث تم استخدام ثلاثة أطوال موجية مختلفة (445 نانومتر، 522 نانومتر، 650 نانومتر) لتقييم مدى تأثيرها على جودة الاتصال تحت الماء. تم استخدام طاقة مرسلة مقدارها 100 مل واط وتم فحص نسبة الإشارة إلى الضوضاء (SNR) ومعدل الخطأ في البتات (BER) ومعدل الخطأ في الرموز (SER) عبر خمس قنوات مائية مختلفة. النتائج أظهرت أن زيادة تركيز المواد العالقة مثل المالوكس والللح تؤدي إلى تقليل الطاقة المستقبلة للإشارة الليزرية وتسبب انقطاع الاتصال. تم رسم الخطوط البيانية لتوضيح العلاقة بين طول الموجة ومعامل الامتصاص في المختبر لعدة أطوال موجية وأنواع مختلفة من المياه. الدراسة أكدت على أهمية اختيار الطول الموجي المناسب للاتصالات تحت الماء لتحقيق أفضل أداء.
Critical review
دراسة نقدية: على الرغم من أن الدراسة قدمت نتائج مهمة حول تأثير طول موجة الليزر على الاتصالات تحت الماء، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن تقديم تحليل أعمق للبيانات لتوضيح العلاقة بين تركيز المواد العالقة وفعالية الاتصالات بشكل أكثر تفصيلاً. ثانياً، كان من الممكن استخدام أطوال موجية إضافية لتوسيع نطاق الدراسة وتقديم نتائج أكثر شمولية. ثالثاً، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية الأخرى مثل درجة الحرارة والملوحة على جودة الاتصال. وأخيراً، كان من الممكن تقديم توصيات أكثر وضوحاً حول كيفية تحسين أداء الاتصالات تحت الماء بناءً على النتائج المستخلصة.
Questions related to the research
-
ما هي الأطوال الموجية التي تم استخدامها في الدراسة؟
تم استخدام ثلاثة أطوال موجية وهي 445 نانومتر، 522 نانومتر، و650 نانومتر.
-
ما هو تأثير زيادة تركيز المواد العالقة مثل المالوكس على جودة الاتصال؟
زيادة تركيز المواد العالقة مثل المالوكس تؤدي إلى تقليل الطاقة المستقبلة للإشارة الليزرية وتسبب انقطاع الاتصال.
-
ما هي المعايير التي تم فحصها لتقييم جودة الاتصال تحت الماء؟
تم فحص نسبة الإشارة إلى الضوضاء (SNR)، معدل الخطأ في البتات (BER)، ومعدل الخطأ في الرموز (SER).
-
ما هي التوصيات لتحسين أداء الاتصالات تحت الماء بناءً على الدراسة؟
التوصيات تشمل اختيار الطول الموجي المناسب وتقليل تركيز المواد العالقة في الماء لتحسين جودة الاتصال.
References used
No references
rate research
Read More
In WDM networks, the end users exchange information with each other through all optical WDM
channels, called light-paths. A light-path must occupy the same wavelength on all the fiber links
through which it traverses. In a WDM optical network, with
a given set of connections, the
question of setting up light-paths by routing and allocating a wavelength to each connection is
called Routing and Wavelength Assignment (RWA) problem. Integer Linear Programming (ILP) is
a mathematical formulation helps in minimizing and maximizing an object function under multiple
constraints. This can help in formulating a mathematical model for RWA. This paper studies a
mathematical model for RWA in WDM Optical networks which can lead to a good network
planning. This paper suggests an enhancement proposal for Syrian telecommunication optical
networks using ILP formulation.
In the present work, a modification of a previously developed electron cascade model
is presented. More than one electronic state is incorporated in the model as well as various
loss processes. Thus, new inelastic process such as photo ionization a
nd electron impact
ionization of the electronic excited state of the argon atom are considered. Moreover, loss
processes which may act to deplete the number of electron such as electron diffusion; three
body recombination and dissociate recombination are taken into account. All these
processes are incorporated into the time-dependent Boltzmann equation which is solved
numerically simultaneously with set of rate equations for both the electron energy
distribution function (EEDF) and the excited state population respectively.
Wireless Sensor Networks (WSNs) are often deployedrandomly;this makes the
positiondetermination of deployed nodes a very difficult issue, which is called localization
problem. The importance of node localization information becomes from the facilit
y of
routing operation and the network control, that makes the network works correctly.
Nowadays, Global Position System (GPS) is appeared as the most important position
system, but it is inapplicable for the low-cost self-configure sensor networks, and also it is
impossible to install GPS for each sensor nodebecause of high cost, large volume and high
complexity required of adding it to nodes, especially for large network.Therefore, a few
number of nodes may be configured with GPS.
In this paper,we will study the localization algorithmAd-hoc Positioning System
(APS) algorithmused inUnderwater WSN, andwill testthe effectiveness of usingitin
determining the node position based on the distance calculated by anchor nodes. These
nodes are the nodes which know their positions.
Various are the Scientific researches and studies, which clarify how mathematical equations are involved in mathematical modulation operation of spot heat source that is used for local surface heating (or melting) of metals & metallic alloys. But thi
s
modulation for spot heating source, which produces high values of heating and cooling speeds, haven't been studied yet because of the complexity of mathematical equations on one hand, and the difficulty to reach a simplified mathematical module, through
which approximate (facility and limited) calculations can be performed for the dimensions of the heat-treated part of metallic alloy's surface by this heating source before beginning with practical applying procedures on the other hand.
A simple mathematical module was invented through this research, which can be used to calculate the depth of the heat-treated layer, which is produced using spot heating source (Laser CO2) for different sorts of carbon steel (various in carbon continent), before beginning of the practical applying procedures to the surface heat treatment of this steel. Laser input parameters (power & linear speed of Laser beam, heattreatment time, metal's heat-physical specifications) and output parameters (depth of heat-treated zone) have to be taken into consideration when using this Mathematical
module. The higher discrepancy among experimental values of laser beam heat-treated zone s depth for two kinds of carbon steel, for different powers of the beam and various linear speeds, and its calculating similarities, does not exceed 16 % in many cases.
The mathematical module which had been invented in this research is characterized by simplicity and the easiness to be used, comparing with many suggested modules for such cases, and that is through the usage of the estimation of depth wanted to be done in the surface of some alloy steel with specific usage.
The primary usages of this mathematical module showed that it has future horizons with special importance, so that this module can be developed to be used in estimating the width of the heat-treated zone as well as its depth on one hand, and this module can be a basis to build another mathematical module through which the estimation of the melt carbon rates of in the net frames of the heat-treated zone's phases can be done, and so estimating the hardness values to these phases , on the other hand.
Although Multi-Input-Multi-Output MIMO improve reliability of wireless
transmission system and increase bit rate, but this improvement relay on higher cost in
Hardware and increase in size as well as complex structure, so the cost-effective challen
ge
still exists to implement these technique.
Performance can be improved without increasing the cost significantly by using
virtual MIMO systems where the spacing is achieved by using pre-existing devices within
the network infrastructure, these systems called cooperative communication systems,
which are the subject of this research.
The simulation is based on standard software for modeling MATLAB and open
sourced Network simulator-3 (NS-3) to characterize problems in wireless communications
systems and propose appropriate solutions.
suggested questions
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
