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Free Space Optics


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:10:42 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:10:42 AM
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s availability. Metropolitan, access and LAN networks are reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customers does not possess access to fibers as well as fiber installation is expensive and demands long time. Moreover, right-of-way costs, difficulties in obataining government licenses for new fiber installation etc. are further problems that has turned FSO into the option of choice for short reach applications.
FSO uses lasers, or light pulses, to send packetized data in the terahertz (THz) spectrum range. Air, ot ..................[:=> Show Contents <=:]



MEMS in space


Posted by: computer science crazy
Created at: Monday 23rd of February 2009 12:49:15 PM
Last Edited Or Replied at :Friday 14th of January 2011 09:02:58 AM
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fabrication techniques similar to the way integrated circuits are made and making these electromechanical elements along with electronics. Material used The material used for manufacturing MEMS is Silicon. Silicon possesses excellent materials properties making it an attractive choice for many high-performance mechanical applications (e.g. the strength-to-weight ratio for silicon is higher than many other engineering materials allowing very high bandwidth mechanical devices to be realized). Components of MEMS Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, s..................[:=> Show Contents <=:]



Lightning Protection Using LFA-M


Posted by: computer science crazy
Created at: Sunday 15th of February 2009 12:36:04 AM
Last Edited Or Replied at :Thursday 01st of March 2012 11:49:33 PM
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s. A long flashover arrester (LFA), which comprises of three flashover modules using the creeping discharge effect, is described in this paper. In this design, the total arrester stressing voltage is applied simultaneously to all of the three modules so that the voltage-time characteristics of the arresters are improved.

It assured reliable protection of medium voltage (e.g., 10kv) over head power line against both induced over voltages and direct lightning strokes. A single LFA per support or pole is found to be sufficient to protect an over head line against induced over voltages. An LFA..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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e fact that needs for bandwidth cannot be satisfied because the next fibre backbone is too far away. Laser links between the backbone and the user can provide quickly a high bandwidth much more cost effective than with other technologies. Due to the atmospheric effects on the propagation of light only short distance links can be established assuring a comparable bit error rate to fibre networks. With optical free space communication devices it's as well possible to replace lower speed wired lines between computer networks with fibre-like delay-free high bandwidth. It turned out as well that op..................[:=> Show Contents <=:]



WIDEBAND OFDM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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es the communication channel into a number of equally spaced frequency bands. A sub carriers a portion of the users information in each band. Each sub carriers is orthogonal (Independent of each other) with every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed communication such as multipath fading and RF noise interferenc..................[:=> Show Contents <=:]



Direct to home television DTH


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:26:57 AM
Last Edited Or Replied at :Monday 01st of August 2011 11:18:36 PM
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stems transmit and receive radio signals using specialized antennas called satellite dishes.
The television satellites are all in geosynchronous orbit approximately 35,700 km above the Earth. In this way you have to direct the dish at the satellite only once, and from then on it picks up the signal without adjustment.
More than 200 channels with excellent audio and video are made available. The dish required is quite small (30 to 95 cm in diameter).



The Overall System
Early satellite TV viewers were explorers of sorts. They used their expensive dishes to discover unique programming..................[:=> Show Contents <=:]



Free Space Optics


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:03:26 AM
Last Edited Or Replied at :Friday 24th of February 2012 11:24:18 PM
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FSO
FSO technology is implemented using a laser device .These laser devices or terminals can be mounted on rooftops ,Corners of buidings or even inside offices behind windows. FSOdevices look like security video cameras.

Low-power infrared beams, which do not harm the eyes, are the means by which free-space optics technology transmits data through the air between transceivers, or link heads, mounted on rooftops or behind windows. It works over distances of several hundred meters to a few kilometers, depending upon atmospheric conditions.
Commercially available free-space op..................[:=> Show Contents <=:]



Lightning Protection Using LFA-M


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:39:22 PM
Last Edited Or Replied at :Sunday 17th of October 2010 11:56:38 PM
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ingle arrester on an overhead line support (pole). For the protection of lines against direct lightning strokes, the arresters are connected between the poles and all of the phase conductors in parallel with the insulators.

Lightning is an electrical discharge between cloud and the earth, between clouds or between the charge centers of the same cloud. Lightning is a huge spark and that take place when clouds are charged to at a high potential with respect to earth object (e.g. overhead lines) or neighboring cloud that the dielectric strength of the neighboring medium(air) is destroyed.

T..................[:=> Show Contents <=:]



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