Ultrasonic sound or Ultrasound
Ultrasonic sound is the
term used for sound waves with frequencies greater than 20,000 Hz. These waves
cannot be heard by the human ear, but the audible frequency range for other
animals includes ultrasound frequencies. For example dogs can hear ultrasonic
sound. Ultrasonic whistles are used on cars to alert deer to oncoming traffic
so that they will not leap across the road in front of cars.
An important use of
ultrasound is in examining inner parts of the body. Thus ultrasound is an
alternative to X-rays. The ultrasonic waves allow different tissues such as
organs and bones to be ‘seen’ or distinguished by bouncing of ultrasonic waves
by the objects examined. The waves are detected, analysed and stored in a
computer. An echogram is an image obtained by the use of reflected ultrasonic
waves. It is used as a medical diagnostic tool. Ultrasonic sound is having
application in marine surveying also.
·
Ultra sound can
be used in cleaning technology. Minute
foreign particles can be removed from objects placed in a liquid bath through
which ultrasound is passed.
·
Ultrasounds can also be used to detect cracks and flaws in metal
blocks.
·
Ultrasonic waves are made to reflect from various parts of the
heart and form the image
of the heart. This technique is called ‘echo cardiography’.
·
Ultrasound may be employed to break small ‘stones’ formed in the
kidney into fine grains. These grains later get flushed out with urine.
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