Electromagnetics Application

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Laser Communicator
Reniel Joseph E. Bautista, Harris W. Guinomla, Jose Paulo Piloton and Khevin Anne A. Francisco, EECE, MSU-IIT

Abstract –This project involves discovering how wireless connections occur in the atmosphere using a beam of laser. The project, laser communicator, uses electromagnetic waves to transfer information without direct connection between the input and output devices. This project will also investigate how the sound waves are transmitted as electrical and light signals through a transistor radio, a transformer, a laser pointer, and a solar photoresistor. This project will employ the concepts of electromagnetism and sound waves. A transformer, which will be connected between the battery, and the laser pointer, will act as a modulator to control the voltage. As the sound is input via an audio device, sound energy will be converted as electrical impulses. These impulses will be converted to light signals through a laser beam. When the light energy is transmitted to the photoresitor by the laser pointer, the energy produced by the light will be converted into the electric signals which will power the output device. This idea is applied in space where laser beam such as infrared light is employed as the major source for data transmission.

Definition of Terms:
1. LASER- a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation. 2. Photoresistor- A resistor whose resistance varies as a function of the intensity of light it is exposed to. 3. Audio Transformer- An iron-core transformer that is used for coupling audio-frequency circuits. I. Introduction

Communication is the activity of conveying information through the exchange of thoughts, messages, or information, as by speech, visuals, signals, writing, or behaviour. The various communication modes provide us the various routes and channels through which the data and information can flow among individuals. The individual will never come to know what the other person is thinking, unless and until the information is shared. Communication does not merely mean sharing one’s thoughts. The receiver after decoding the information must respond accordingly and also provide feedback to the speaker. The communication loop has to be complete to make it effective and simple. Communication can be between individuals, and even between machines. The flow of information can be from a human being to equipment and vice versa. Just like the satellite mode of communication or the optical mode of communication, communication can also occur with the help of Laser and microwave. These are also modes of communication which help in the transmission of signals from the sender to the receiver. In this project, we are highlighting the Laser Communication System, which occur connections through a free-space. Laser Communication originated in early 1960’s and since then many advancements were made in this line of communication.  Laser communications systems can be easily deployed since they are inexpensive, small and of low power. This mode of communication is also faster as compared to the other modes and thus is mostly preferred over other types of communication system. One thing to be careful in a laser mode of communication is that the signals must flow without any hindrance. II. Review of Related Literature and Studies

This chapter presents the related literature and studies of reliable sources, both of which have significant bearing or relation to the project. The basic concepts of laser were first given by an American scientist. Charles Hard Townes and two Soviet scientists, Alexander Mikhailovich Prokhorov and Nikolai Gennediyevich Basov who shared the coveted Nobel Prize (1964). However, Theodore Harold Maiman of the Hughes Research Laboratory, California, was the first scientist...
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