Samyung SES2000, Руководство пользователя

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1.1 Overview
The Echo sounder an older instrumentation system for indirectly determining ocean
floor depth. Echo sounding is based on the principle that water is an excellent
medium for the transmission of sound waves and that a sound pulse will bounce off a
reflecting layer, returning to its source as an echo. The time interval between the
initiation of a sound pulse and echo returned from the bottom can be used to
determine the depth of the bottom. An echo-sounding system consists of a
transmitter, a receiver that picks up the reflected echo, electronic timing and
amplification equipment, and an indicator or graphic recorder.