Pulse echo detection

How bats and dolphins use echolocation

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Pulse-echo detection
Bats live in the woods. They fly at about 10km-h to around 15km-h. This will differ from
species to species. Bats do not have very good vision, and therefore they need an
alternate method to detect their location and their surroundings. They use high frequency
sound pulses, which give them a detailed image of 5 metres around them. The way in
which they build up their image is quite complex. They have to make a high pitched noice,
which lasts only 3 milliseconds. The sound will hit nearby objects, and the reflect sound
will enter the Bat's ear. Their brains will measure the time between pulse emission and
echo rec
eption. They have evolved to use speed x
time to calculate the distance between themselves and the object.
Another animal which uses pulse-echo detection is dolphins. They have a more
sophisticated system that bats, since they can build up an image of what the surrounding
shapes look like. Bats can also do this, but not quite as well as dolphins. Dolphins can
respond to the images they build up in a more effective way that bats can.
Although humans do not have the ability to use pulse-echo detection, we have
developed manmade applications such a sonar on ships, medical imaging and also to see
how far the moon is from asteroids.


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