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LASER COMMUNICATION PDF

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LASER COMMUNICATION SYSTEM Naveen, Shreyas A S, Ravi Ghael, Najashree Department of electronics and communication, IEEE Abstract— Laser . PDF | First Page of the Article | ResearchGate, the professional network for scientists. he purpose of the Free Space Laser Communications. PDF | Laser communications systems offer a significant advantage over traditional radio frequency systems due to the shorter wavelength of laser light. Data can.

Skip to main content. Log In Sign Up. Naveen Gouda. They work similarly to communications. While the transmitter and receiver must require line-of- sight conditions, they have the benefit of eliminating the need for broadcast rights and buried cables.

Log In Sign Up. Naveen Gouda. They work similarly to communications. While the transmitter and receiver must require line-of- sight conditions, they have the benefit of eliminating the need for broadcast rights and buried cables. Laser communications systems can be easily deployed since they are inexpensive, small, low power and do not require any radio interference studies. The carrier used for the transmission signal is typically generated by a laser diode.

Two parallel beams are needed, one for transmission and one for reception. Due to budget restrictions, the system implemented in this project is only one way. Due to its low noise ratio makes its one of the well suited communication medium for exchanging of information. Currently laser communication is adopted in satellite communication for space research activities Laser communication can be used to transmit sound and and due to its efficiency on low noise ratio, inexpensive, low data signal through the laser beam of system.

The intensity of power, flexibility and its resistance to the radio interference the carrier beam changes with change in amplitude of sound makes laser communication as one of the research area in signal. The variation intensity of laser beam is converted into a wireless communication. In this process, this paper comprises variation in the voltage level by using solar panel.

In this mode one such application of laser communication for information of communication the transmitter and receiver requires to exchange between any two devices. The carrier requires for transmission of signals in laser communication system is generated by laser diodes.

In laser communication the transmitter and receiver must B.

Transmitter circuit: The carrier used for transmission D. The optical communication system consists of transmitter uses a laser beam of wavelength nm as a carrier in free space. Receiver circuit: Laser communication plays a key role, as solutions for satisfy ever increasing high demand of bandwidth. In laser F. It supports possible transmit speeds of up to a gigabit per second, other application of laser communication system H. Potmeter VR1 10K ohms , multimeter.

The voltage variation on the solar panel is amplified by a low-voltage audio power amplifier LM and reproduced by a speaker. The maximum output of audio amplifier LM is 1 watt, while its voltage gain is 20 to The circuit consists of a transmitter and a receiver. The voltage divider network formed by R2, R3 and VR3 keeps the voltage as well as the current for the laser diode in the safe region.

In place of the Assemble the transmitter and receiver circuits on separate laser diode, you can also use a laser pointer. The spring inside PCBs and enclose in suitable cabinets.

Audio laser communication.pdf

In the transmitter the laser pointer is the negative terminal. The output power of cabinet, fix two terminals for connecting the audio signal. Fix the laser pointer is 5 mW. Take care while working with laser, switch S1 on the front panel and the laser diode LD1 or laser as direct exposure to the laser beam can be hazardous to your pointer to the rear side of the cabinet. Keep the 9V battery eyes.

Point the laser beam to the solar panel. Pot meter VR1 inside the cabinet. The audio input Vin is taken from the preamplifier Solar panel to the rear side such that the transmitted beam output of the music system CD player, DVD player, etc. Fix switch S2 on the front panel and the Capacitor C2 and preset VR2 are used to vary the gain of the speaker to the rear side. Keep the 9V battery inside the LM The software is designed to be completely interrupt driven.

Timing is based around the ability to control an output pin, allowing us to accurately control the motor for scanning purposes. The interrupt service routine is called once every 5usec.

(PDF) LASER COMMUNICATION SYSTEM | Naveen Gouda - cittadelmonte.info

Upon each interrupt, program updates its timing counters, reads the output of the analog-to-digital convertor when necessary, and performs state updates for receiver tracking purposes. The above diagram shows the block diagram of Laser Communication System, which mainly comprise of 2 sections Fig 1 such as transmitter section and receiver section. The gain of the circuit, analog to digital converter and laser diode to generate amplifier is fixed by capacitor C7.

Preset VR4 is used to medium for transmission of signals. The receiver section is change the signal level from the solar panel. This signal is fed used to receive the laser beam using the photo transmitter, to input pin 3 of IC2 through coupling capacitor C5 so that the which incorporated with the data or sound signals from the DC value from the solar panel can be eliminated.

The detector means transmission is usually done using digital signals requiring preferably includes means for recognizing the confirmation hardware for decoding at the receiver end. WORKING [2] With possible transmit speeds of up to a gigabit per second, other applications for Laser communications systems When we give the input like sound or data, microphone technology include temporary connectivity needs e. This signal coming off the events, disaster scenes, or conventions , or space based microphone was far too low to be read by the analog to digital communications.

So, for increase the strength of the signal we pass [3] With the powerful laser, it would even be possible to the signal through the microphone amplifier. Before the signal communicate using satellites to reflect the signals. It is of fundamental importance to understand that when stimulated emission takes place the emitted photon has exactly the same wavelength.

When this happens the energy has to go somewhere and it is often34 emitted in the form of light. Stimulated emission is what happens in the operation of a laser. There is only one way that light can be produced: The primary wavelengths of laser radiation for current military and commercial applications include the ultraviolet. The infrared region of the spectrum consists of radiation with wavelengths between nm and 1 mm.

In some situations when an electron enters a high energy excited state it is able to stay there for a relatively long time a few microseconds before it changes state spontaneously.

When an electron is elevated to a high energy state this state is usually unstable and the electron will spontaneously return to a more stable state very quickly within a few picoseconds emitting a photon as it does so. This is the portion we call visible light.

Ultraviolet radiation for lasers consists of wavelengths between and nm. The energy can come from many sources: The black dot indicates the state of the atom before and after a transition takes place a By spontaneous emission in which the atom returns to the lower energy state in an entirely random manner. Figure 2: Energy state diagram showing: To overcome these issues.

Free-space optical communication FSO systems in space and inside the atmosphere have developed in response to a growing need for high-speed and tap-proof communication systems. FSO is the next frontier for net-centric connectivity. Over the last two decades free-space optical communication FSO has become more and more interesting as an adjunct or alternative to radio frequency communication.

Links involving satellites. Data trickle. RF techniques can be problematic. As shown in Figure 8 Figure4: The basic circuit is made using a difference amplifier having two inputs plus and minus and at least one output.

Non-Inverting Amplifier. Some Op-amp Applications: Voltage follower Buffer. Inverting Amplifier. Inverting Amplifier: Figure 5: Inverting Amplifier 9. The LM series are general purpose operational amplifiers which feature improved performance over industry standards the lmis reliable and required no frequency compensation.

Above all. LM Table 2: Some Op-amp Parameters 4. The inputs are ground referenced while the output is automatically biased to one half the supply voltages. The LM is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low. The Quiescent power drain is only 24 mw when operating from a 6 volt supply. This device is designed for use as general purpose amplifiers and switches requiring collector currents to mA.

Laser light is very different from normal light. It contains one specific wavelength of light one specific color. The wavelength of light is determined by the amount of energy released when the electron drops to a lower orbit. BC transistor 4. Laser light has the following properties: A laser light has a very tight beam and is very strong and concentrated.

A flashlight. This means that all of the photons have wave fronts that launch in unison. Transmitter components 2-Receiver: The phototransistor of the receiver must be accurately oriented towards the laser beam from the torch. Transmitter Circuit The transmitter uses 9V power supply. The laser diode has an inbuilt collimating lens. The gain of the op-amp can be controlled with the help of 1-mega-ohm potentiometer VR1.

This board is therefore a high gain amplifier with a basic audio output stage. Using this circuit you can communicate with your neighbors wirelessly. The electronics modulates the intensity of the laser beam according to the output of the microphone.

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The transmitter board has an electrets microphone module at one end. The laser torch can transmit light up to a distance of about meters.

If there is any obstruction in the path of the laser beam. Instead of RF signals. The receiver uses a photodiode as the receiving element. There are two sections: The receiver does not need any complicated alignment. But the sensor should not directly face the sun. The receiver circuit uses an npn phototransistor as the light sensor that is followed by a twostage transistor preamplifier and LMbased audio power amplifier.

Receiver circuit Just keep the phototransistor oriented towards the remote laser pointer and adjust the volume control for a clear sound. To avoid 50Hz hum noise in the speaker.

The reflected sunlight. Transmitter circuit Figure By making the circuit in Orcad circuit simulator. By connecting the circuit as shown in figures.

Transmitter Hardware implementation Figure Receiver Hardware implementation Figure Receiver Hardware implementation using stereo speaker The system performs better in a dark room than it does in a room with the lights on.

Low performance photo-Diode. Using laptop connected to the circuit via an Aux cable. Using Stereo Speaker. Low quality components. Weak laser source only 50mW.

Due to time and equipment constraints. Lowering the noise coming from the different light sources florescent bulbs.

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