Echo Sounding

• Echo sounding (sonar) is the use of ultrasonic waves for detecting objects in deep water , and measuring the depth of the water
• Echo sounding involves sending an ultrasound pulse into the water , which is then reflected back when it hits a surface
• What is the equation used to calculate the distance travelled by the sound wave?

  Distance = speed x time
• In the equation used to calculate the distance travelled by the sound wave, how do you find the time

  To find time, you measure the time between the pulse being sent and the reflection being detected
• In the equation used to calculate the distance travelled by a sound wave, what is the speed equal to?

  The speed is equal to the speed of sound in water which is 1500 m/s
• How do you work out the depth of the water using ultrasonic waves?

  You work out the distance travelled by the ultrasonic wave (use the speed x time equation) then divide that answer by 2
• The speed of ultrasound in water is 1500 m/s
• Ultrasonic imaging and echo sounding both work by detecting the time between a transmitted pulse and a reflected pulse