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  • Applied Physics-I - AP1
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Tanush Desai
Tanush Desai
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Ultrasonics • Introduction to Ultrasonics • Properties of Ultrasonic waves • Ultrasonic ProductionMagnetostriction Method • Ultrasonic Production- Piezo Electric Method • Applications of Ultrasonics • Worked Problem PH0101 UNIT 1 LECTURE 6 1

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Introduction to Ultrasonics • The word ultrasonic combines the Latin roots ultra, meaning ‘beyond’ and sonic, or sound. • The sound waves having frequencies above the audible range i.e. above 20000Hz are called ultrasonic waves. • Generally these waves are called as high frequency waves. • The field of ultrasonics have applications for imaging, detection and navigation. • The broad sectors of society that regularly apply ultrasonic technology are the medical community, industry, the military and private citizens. PH0101 UNIT 1 LECTURE 6 2

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Properties of ultrasonic waves (1) They have a high energy content. (2) Just like ordinary sound waves, ultrasonic waves get reflected, refracted and absorbed. (3) They can be transmitted over large distances with no appreciable loss of energy. (4) If an arrangement is made to form stationary waves of ultrasonics in a liquid, it serves as a diffraction grating. It is called an acoustic grating. (5) They produce intense heating effect when passed through a substance. PH0101 UNIT 1 LECTURE 6 3

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Ultrasonics Production Ultrasonic waves are produced by the following methods. (1) Magneto-striction generator or oscillator (2) Piezo-electric generator or oscillator PH0101 UNIT 1 LECTURE 6 4

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