Such as active sonar, unlike passive, not only picks up sounds that are distributed objects, but he sends call letters to them. Industrial fish finders are used during military operations to detect underwater enemy ships and navigation of the peace courts.
Unlike humans, dolphins use echolocation, also called biosonar, for the past several millennia. And needless to say, they are incredibly successful in this! The ability of the supersensitivity built into their DNA, so they can easily be distinguished in the water pneumatic BB gun from a little wheat grain at a distance of 15 metres or more.
The sonar of dolphins, or allocate similar in nature to allocator bats and some whales. As you know, dolphins emit characteristic sounds, such as clicks and squeaks. But many of the sounds dolphins our ear does not catch because of too high frequencies. These high frequency sounds use our marine brothers for sonar. They detect underwater objects like active sonar in submarines.
Here’s how the process of echolocation in dolphins:
1) Dolphin through the respiratory tract produces a characteristic sound and sends it through the frontal lobe. There he focuses before you go into the water.
2) If the sound of the running water encounters an obstacle, it bounces back to the Dolphin like an echo.
3) Dolphin it absorbs the returned echo through my jaw.
4) the Echo passes through the channel from the jaw to the inner ear of the Dolphin, where the information via nerve impulses enters the brain. There Dolphin interprets the received data about the object: size, shape, and composition.
Using echolocation, dolphins can easily determine the size and shape of objects or animals, and in some cases even distinguish the composition of metals such as copper and brass with very long distances and in noisy environments. It is this amazing ability helps the dolphins in mine detection and submarine bombs.
Scientists still can’t accurately determine how Dolphin interprets the information obtained in the course of dowsing. Is still, to imagine how we could see things not through the eyes and ears. More serious and deep study of the echolocation of dolphins, possibly, will help to improve our own technology. But until then we have to resort to the dolphins when it detects dangerous underwater objects. However, now more and more people in the world raise a question about the ethics of using dolphins for such purposes.