Name: Sound Wave
Uploaded: 2019-07-19
Duration: 3 min 42 s
Description: Sound is a form of energy with a waveform. How is it produced, and what type of vibrations occurs during the propagation of a sound wave? Let's explore sound...

Question

Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.

Accepted Answer

SONAR is a device which uses ultrasonic waves to measure the depth of sea, direction and speed of underwater objects. SONAR stands for sound navigation and ranging.

SONAR consists of a transmitter and a detector for ultrasonic waves. Both are installed in a ship as shown in the figure given below.

The waves generated by the transmitter travel through the water and after striking the object on the seabed they get reflected back and are received by the detector. The detector transforms the reflected waves into electrical signals exactly interpreting the pattern of the object on the seabed. The distance of the object reflecting the sound can be estimated by knowing the speed of the sound in water and the time lag between the transmitted and received signals. If $d$ is the depth or distance of seabed then the total distance traversed by the signal is $2 d$ . Thus, $2 d = v t$ where $v$ is velocity of sound and $t$ is the time.

Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.

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