Sonar
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Sonar
Sonar (/'soʊ.nɑːr/), an acronym for Sound Navigation and Ranging, is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
Etymology
The term Sonar is derived from the phrase Sound Navigation and Ranging. It was originally developed by the U.S. Navy to detect submarines.
Related Terms
- Acoustics: The study of sound or vibration waves. Sonar uses the principles of acoustics to detect and locate objects underwater.
- Echo: A reflection of sound that arrives at the listener some time after the direct sound. Sonar systems use the echo principle to determine the location and distance of objects.
- Frequency: The number of occurrences of a repeating event per unit of time. Sonar systems use different frequencies of sound to detect objects at different distances.
- Hydrophone: A microphone designed to be used underwater for recording or listening to underwater sound. Most sonar systems use a hydrophone or an array of hydrophones.
- Submarine: A watercraft capable of independent operation underwater. Sonar was originally developed to detect submarines.
- Underwater acoustics: The study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. Sonar uses the principles of underwater acoustics.
See Also
- Radar: A detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
- Lidar: A method for measuring distances by illuminating the target with laser light and measuring the reflection with a sensor. Differences in laser return times and wavelengths can then be used to make digital 3-D representations of the target.
External links
- Medical encyclopedia article on Sonar
- Wikipedia's article - Sonar
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