Underwater Acoustics

My communication course is communication which is not wireless. The theme I chose was underwater sound. Study the application of underwater sound and its advantages and disadvantages. All forms of non-wireless communication are based on waves. Waves are usually surface disturbances that transfer energy from A to B. Waves are mechanical vibrations through the medium. For example: water, sound. These waves are called mechanical waves. Generate traveling waves from one point and distribute energy to the surrounding environment.

Application of underwater acoustics, wave equation, plane, spherical wave, cylindrical wave, propagation and reflection of sound wave, radiated sound, radiated sound and received sound, unipolar and dipole sound source, acoustic array, sound propagating in deep sea and shallow water, active sonar, sonar Equation, transmission loss, environmental noise in the sea, target strength. Introductory course to introduce basic principles of coastal engineering. In the early stages of the course, it is designed to understand coastal environmental physics. Topics include basic theory (creation of waves, refraction, diffraction, shallow), wave prediction technology, tidal and coastal circulation, and sediment transport. In the second half of the course, we will focus on the application of these basic principles such as stability and port development.

In this article I will explain the physical basis and use of sound waves as a wireless communication carrier in an underwater environment and then the overview of the underwater wireless communication routing protocol will be described in section III. In the fourth section we discussed two network architectures of UWSNS. Section 5 describes the acoustic modem technology and details the Link Quest's cutting-edge acoustic modem. Section 6 compares the ground sensor with the mobile UWSN, and Section 7 compares various applications. UWC Finally, we will summarize the thesis in chapter 8, then summarize the references.

Of the three types of waves, acoustic waves are used as main carriers for underwater wireless communication systems because absorption is relatively low in aquatic environments. We begin discussing the physical basis and significance of using sound waves as wireless communication carriers in an underwater environment. Propagation speed: The very slow propagation speed of sound in water is an important factor for distinguishing it from electromagnetic wave propagation. The speed of sound in water is determined by the temperature of water, salinity, pressure (it is directly related to depth). The general sound speed in water near sea level is about 1520 m / s. It is 4 times faster than the sound speed in the air, but it is 5 orders of magnitude smaller than the speed of light. The speed of sound in water increases with increasing water temperature, salinity, and depth.