Abstract
Diverse need proper communication techniques as sound waves cannot propagate through water. Research fraternity has designed several underwater communication systems to solve this communication problem. Researchers have opted several approaches for audio signal communication through water. Designed communication systems vary in complex circuitry, audio signal quality, system components and cost. In this present study, we seek to experimentally demonstrate the feasibility of light emitting diodes (LEDs) and solar cell receiver for audio signal transmission through water. Audio signals were transmitted through water by imposing over blue, green and red LEDs. We have examined light scattering and our findings validate LEDs with shorter wavelength show less scattering. This paper also outlines an approach for out-of-sight communication. In our experimental trials, the maximum propagation distance is 25 m by using 450 nm blue light emitting diode with 20-W optical power. This study also includes discussion of collimating lens effect on audio signal transmission.
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