Echosounder and SONAR (Sound Navigation And Ranging) are both instruments used for underwater depth measurement and detection of underwater objects. The main difference between them lies in their applications and operational principles.
Echosounder is primarily used for determining the depth of the seabed and mapping the seafloor. It uses sound waves that are transmitted from the ship’s transducer and reflected from the seafloor, with the time taken for the echo to return providing the depth measurement. Echosounders are mainly used for navigation and safety purposes in ships.
On the other hand, SONAR is used for detecting and locating underwater objects, such as submarines, shipwrecks, fish schools, and other marine life. SONAR sends out a signal that bounces off the underwater object and returns to the receiver.
By analyzing the time, strength, and frequency of the returning signal, SONAR can determine the size, shape, and distance of the object. SONAR is widely used in military, research, and commercial applications, such as fisheries and oil and gas exploration.
In summary, an echosounder is used for depth measurement and mapping of the seafloor, while SONAR is used for the detection and location of underwater objects.