The sound waves with frequencies above 20kHz are called as Ultrasound and operate at the frequencies higher than the normal human hearing range i.e. 20 Hz to 20 kHz. These are used to measure the distance of an object by projecting sound waves on them. Ultrasonic probe uses the ultrasonic wave which generates the signals and detects the returned signals and creates image of the object. This technique is widely used for the visualization of the internal body parts for diagnostic purposes ... Read more