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Echo Sounding is measurement of the depth of the ocean by directing a sonic or ultrasonic pressure wave vertically downward and determining the time taken before the echo is received.
 Research Echo Sounding
Sonar is a method of locating underwater objects by the reflection of ultrasonic waves.
Research Sonar
Ultrasonic is a term referring to sound waves higher in frequency than 15 kHz.
Research Ultrasonic
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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Abbreviations
