The development of a low-cost laser communication system for the classroom

Sparks, Robert T.; Pompea, S. M.; Walker, Constance E.

doi:10.1117/12.2207498

Cited by 1 publication

(4 citation statements)

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“…Robert T. Sparks, Stephen M. Pompea and Constance E. Walker have made one system to transmit music or voice over 350 feet by using laser for class room use in schools. In this project they have used the same receiver which is used in NASA SOFIA Active Astronomy Infrared Kit which consists of radio Shack and small solar cell along with a clip-activated laser pointer and centre tapped audio transformer [3]. Peter Phillips described a low cost laser beam communicator project in 1993 by using visible laser diode (5mW, 65Onm) in transmitter [12].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The Laser torch based voice transmission system available in market is at $614 [3] which is very expensive in respect to normal use of general people in Bangladesh. One low cost system was designed which can be constructed at US $60 [3] or 5100 BDT which is not too cheap for general use for low income people here in Bangladesh. All previous designs have used photo transistor as receiving sensor.…”

Section: A Statement Of the Problemmentioning

confidence: 99%

“…6" is the connected circuit of receiver on PCB board of our project. We have used an LDR (light dependent resistance) instead of using photo transistor and photo diode of PETER PHILLIPS's circuit [12] and solar cell of the project of Robert T. Sparks, Stephen M. Pompea and Constance E. Walker [3]. We did not get any response by using photo transistor at the time of experiment.…”

Section: For Receiving Systemmentioning

confidence: 99%

“…LDR has other advantage over photo transistor is that, it does not need proper biasing for working and easy to use and get here and there. The laser voice transmission system price available in market is 614 USD and the lowest cost laser transmission system was designed at 60 USD by Robert T. Sparks, Stephen M. Pompea and Constance E. Walker of National Optical Astronomy Observatory, Tucson, Arizona, USA [3]. This project construction cost is only 8.4661 USD, 85.8898% lower than that of the lowest cost system.…”

Section: B Cost Of Receiver Circuitmentioning

confidence: 99%

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Low Cost Voice Communication Device Design Using Ordinary Laser Torch and LDR Available in Bangladesh

Ahmmed¹,

Pranti²,

Iqubal³

2013

IJEEE

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As living in the society, communication is the most important activity of human being. All most for every purpose we are communicating with each others. Different modes of communication are used and voice communication is one of those categories. From the beginning of technological advancement, many processes have been used for the voice communication purpose and among those, Laser Voice Transmission Process is much more useful because of wireless connectivity and free from disadvantage of radio frequency transmission. Long distance high cost Laser voice transmission system is not economic for the purpose of ordinary communication. This paper deals with the designing of a very low cost voice transmission system which is perfect for information transmission of general conversation in Bangladesh, using an ordinary available LDR and Laser torch of cost BDT 727. This is almost 86% cheaper than the lowest cost voice transmission system available in this country.  Index Termslaser torch, voice transmission, low cost design I. INTRODUCTION From the beginning of human living, before the invention of language, communication was the biggest challenge. Human being had always the necessity for communication throughout the history. Initially, communication was done through signals, voice or primitive forms of writing. As time has changed, the necessity of communication through distances was grown  Manuscript received May 14, 2013; revised October 24, 2013 to pass information from one place to another. Different ways to exchange information over long distances like pigeons and smoke signals have been adopted in every stages of civilization advancement, some of them have sustained and some has vanished. All these methods were the pioneer of today's modern technological longdistance communication system. This system involves transmission and reception of a large amount of information in a short period of time. Gradually through the technological development, man has invented different procedure of communication with each other. Now communication has entered in our daily life in many ways like telephone, radio, televisions, cell phone, computer and Internet, in our office and home. Different modes of communication can provide rapid connection from every corner of the globe and even out of the globe (aircrafts, rockets and satellites in space). Along with the wire communication system like telephone, two ways wireless communication system like mobile, internet have become popular now a day. As Laser is stimulated radiation, problem of interference occurs in electromagnetic wave is eliminated, it can be a good substitution of present day communication systems [1], [2]. The laser based voice communication system currently available in market is expensive, $614 [3], in respect to our country's general people income. The people of our country generally use cell phone now days to communicate with each other for general purpose and sometimes spent hours and money (as call tariff) to talk with next door neighbor, specially young genera...

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Section: Literature Reviewmentioning

confidence: 99%

Section: A Statement Of the Problemmentioning

confidence: 99%

Section: For Receiving Systemmentioning

confidence: 99%

Section: B Cost Of Receiver Circuitmentioning

confidence: 99%

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