MCP Ultrasonic waves experiment system of reflexion en Shanghái, Shanghai, China
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Ultrasonic waves experiment system of reflexion
ObjectsDemonstrating the principle of an echo sounder.Determining the velocity of sound in air from the transit time of a sound pulse and the distance to the reflecting object.Determining distance by measuring the transit time of the sound pulse.
PrinciplesUltrasonic waves are reflected at the boundary surfaces between media with differing resistances to sound waves. An echo sounder (or sonar)device emits pulsed ultrasonic signals and measures the time in which a signal is reflected from such a boundary surface to the receiver. To simplify the configuration, the transmitter and receiver are in the same location.
The time between transmission and reception can be used to determine the distance to the reflecting object (if the velocity of sound is known), or to determine the velocity of sound over a known distance. This method is commonly used e.g. to determine water depths at sea.