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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 in 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 in 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 are therefore closer ears can hear sounds at higher frequencies than those with ears far apart, this is essentially due to the longer wavelengths that 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 an oral cavity and cranial quite 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 entre 12 y 35 Hz), comunican la necesidad de reproducirse tanto de machos como de hembras, las cuales pueden ser contestadas por individuos alejados hasta cuatro kilómetros. Pero no sólo lo utilizan para la reproducción sino también para acordar la hora de amamantar a las crías o el recorrido de un paseo. Futuras aplicaciones del infrasonido

Los investigadores del infrasonido están interesados en sonidos de 10 Hz y más bajos (hasta 0,001 Hz). De hecho, este rango de frecuencias es el mismo que utilizan los sismógrafos para monitorear terremotos o los sensores infrasónicos para descubrir las señales acústicas provenientes de las explosiones. Debido a que tanto volcanes, tornados, 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 being developed now and still no clear interpretation. We will see that ultrasound

have more application in this field.