Question

Notes on sonar technique

Answer 1

A sonar which stands for Sound Navigation and Ranging is a technique used for determining the depth and also locating underwater objects such as reefs, submarines etc.
In this method, to find the depth of ocean, a strong ultrasonic wave is sent from the ship towards the bottom of the ocean.
This ultrasonic is received back after it is reflected from the bottom of sea.
The time interval t for travel of sound waves from the ’ source to the receiver after reflection is noted.
Then the depth d of ocean is given by the velocity of D = V x t/ 2, where V is the velocity of sound.

Answer 2

SONAR - Sound Navigation and Ranging

SONAR is used to determine the direction and speed of underwater objects. SONAR is generally found in ships and boats. SONAR uses ultrasonic sound waves to detect the underwater objects, fishes, submarines, boats.

How SONAR works ?

There is a transmitter at the bottom of ship which produces and transmits the Ultrasonic sound. These ultrasonic sounds strikes at the depth of the sea. And, it comes back towards the receiver which is fitted at the bottom of the ships and boats. This receiver receives the sound reflected from depth of the sea and perceives it. Later, this signals is properly interpreted and time between transmission and reception is noted. And, this is how it is helpful to find depth and underwater objects in sea.

How SONAR helps to find underwater objects ?:

If the time difference between transmission and reception is less than normal, then it is expected that, there is something underwater object which is reflecting the sound before reaching the depth. And, in this way, SONAR is used to determine underwater objects, depth of sea, Underwater hills, Icebergs, Submarines, valleys.

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