Search results
Results from the WOW.Com Content Network
Animal echolocation, non-human animals emitting sound waves and listening to the echo in order to locate objects or navigate. Human echolocation, the use of sound by people to navigate. Sonar (sound navigation and ranging), the use of sound on water or underwater, to navigate or to locate other watercraft, usually by submarines.
The term "echolocation" was coined by zoologist Donald Griffin in 1944. But the phenomena was known about earlier, for example, Denis Diderot reported in 1749 that blind people could locate silent objects. [1] Human echolocation has been known and formally studied since at least the 1950s. [2]
The term echolocation was coined by 1944 by the American zoologist Donald Griffin, who, with Robert Galambos, first demonstrated the phenomenon in bats. [1] [2] As Griffin described in his book, [3] the 18th century Italian scientist Lazzaro Spallanzani had, by means of a series of elaborate experiments, concluded that when bats fly at night, they rely on some sense besides vision, but he did ...
Examples include echolocation of bats and dolphins and insect antennae. Using self-generated energy allows more control over signal intensity, direction, timing and spectral characteristics. By contrast, passive sensory systems involve activation by ambient energy (that is, energy that is preexisting in the environment, rather than generated by ...
These types of echolocation pulses afford the bat the ability to classify, detect flutter (e.g. the fluttering wings of insects), and determine velocity information about the target. [5] Both CF and CF-FM bats use the Doppler shift compensation mechanism in order to maximize the efficiency of their echolocation behavior.
Swedish soldiers operating an acoustic locator in 1940. Acoustic location is a method of determining the position of an object or sound source by using sound waves. Location can take place in gases (such as the atmosphere), liquids (such as water), and in solids (such as in the earth).
Several explanations for why cetaceans strand themselves have been proposed, including changes in water temperatures, [3] peculiarities of whales' echolocation in certain surroundings, [4] and geomagnetic disturbances, [5] but none have so far been universally accepted as a definitive reason for the behavior.
Echolocation is the process where an animal produces a sound of certain wavelength, and then listens to and compares the reflected echoes to the original sound emitted. Bats use echolocation to form images of their surrounding environment and the organisms that inhabit it by eliciting ultrasonic waves via their larynx.