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Infrasound Infrasound

applications of infrasound The main application of infrasound is the detection of objects. This is due to poor absorption of these waves in the middle, unlike ultrasound

, as we shall see. For example a plane wave of 10 Hz is absorbed four times less than a wave of 1000 Hz in water. The downside is that objects should be large enough to detect because, in such frequencies, the wavelength is very large which limits the minimum diameter of the object. As an example we say that a 10 Hz infrasound has a wavelength of 34 m in the air, then the objects to be detected should have a size of about 20 m in the air and 100 m in water.

communication of elephants

Example applications of the ultrasonic waves are in the animal world and communication among individuals of the same species. The most representative and most importantly we have the elephants. Evolution has made these animals emit infrasound, as these are not affected as they pass through giant forests and plains and allows them to communicate over great distances. Thus, females can tell males they are away from them, who are ready to mate, or a group can tell another where to find food. It has been found that the acoustic communication of this type can accurately locate the source of the signal, both time and space.

How is it possible that elephant infrasound appreciate? The key is the distance between your ears

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Animals with small heads, which therefore have their ears closer, can hear sounds at higher frequencies than those with ears far apart, this is due mainly to the longitudes wave as we perceive sounds with wavelengths about our body size. From this, since the infrasound have long wavelengths, we can conclude that elephants can hear and produce this type of sound waves because they have a pretty mouth and head large.

Elephants are grouped into families that are coordinated through infrasound for miles around. Some of these calls, the strongest (116 dB and a frequency between 12 and 35 Hz), communicate the need to reproduce both males and females, which can be answered by individuals up to four kilometers away. But not only used for reproduction but also to arrange a time to nurse the pups or the route of a walk. Future applications

infrasound infrasound researchers are interested in the sounds of 10 Hz and lower (down to 0.001 Hz). In fact, this frequency range is the same one used seismographs to monitor earthquakes, infrasound sensors to find the acoustic signals from explosions. Because both volcanoes, tornadoes, turbulence of meteors, produce infrasound, those waves could detect and prevent a natural disaster.

In the not too distant infrasound stations will be built to solve, for example, problems of false alarms. Other acoustic techniques can be used in the field of medicine, for example in relation to bone disease or osteoporosis. The latter is currently being developed and not yet presented an interpretation clear. We will see that ultrasound

have more application in this field.