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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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ess 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 fiber, is the transport medium. T..................[:=> 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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cs components. These satellites are called I Kg class satellites or Picosats. These satellites having high resistance to radiation and vibration compared to conventional devices can be mass-produced there by reducing the cost. These can be used for various space applications. Also small satellites can be constructed by stacking wafers covered with MEMS and electronics components. These satellites are called I Kg. TECHNOLOGY Although MEMS devices are extremely small MEMS technology is not about size. Instead, MEMS is a manufacturing technology; a new way of making complex electromechanical syst..................[:=> 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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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 should ..................[:=> 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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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 optical free space communication can be used to interconnect LAN's in campus or industrial environments in a reasonable way or to deploy temporary internet connection while the fibre installation can be done. Another application is to use laser links to bypass a broken data connection.

Military applications
There a..................[:=> Show Contents <=:]


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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ng (OFDM) is multicarrier transmission technique. OFDM is a communication technique that divides 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..................[:=> 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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h teleshopping, fax and internet facilities. DTH television is used in millions of homes across United States, Europe and South East Asia. Direct to home television is a wireless system for delivering television programming directly to a viewer's house. Usually broadcasting stations use a powerful antenna to transmit radio waves to the surrounding area. Viewer's can pickup the signal with a much smaller antenna. The main limitation of broadcast television is range. The radio signal used to broadcast television shoot out from the broadcast antenna in a straight line. Inorder to receive these si..................[:=> 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 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 optics equi..................[:=> 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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path may be over the insulators down to the pole to the ground. The over voltage set up due to the stroke may be large enough to flashover this path directly to the ground. The direct stroke can be of two types

1. stroke A
2. stroke B

In stroke A, the lightning discharge is from the cloud to the subject equipment(e.g. overhead lines). The cloud will induce a charge of opposite sign on the tall object. When the potential between the cloud and line exceed the breakdown value of air, the lightning discharge occurs between the cloud and the line.

In stroke B the lightning discharge occur..................[:=> Show Contents <=:]

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