Active acoustics
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Active Acoustics is a means of measuring the range to an object by producing a sound and measuring the time it takes for an echo to return from the object. The range is calculated as a function of the speed of sound and the time it takes for the echo to return.
Active acoustics is the principle behind SONAR or hydroacoustics for underwater measurements.
Active acoustic split-beam systems are capable of detecting organisms as small as krill, with no limit on upper sizes. Fish position within the ensonified beam can be accurately located, allowing calculation of target strength, swim speed, and direction of movement.
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