Essay 20266

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Depending on the wavelength and frequency ultrasound obtains different features of emission, reception, propagation and usage, therefore the ultrasonic range is divided by 3 bands:
• Low ultrasonic frequencies (2104 – 105 Hz);
• Middle ultrasonic frequencies (105 – 107 Hz);
• High ultrasonic frequencies (107 – 109 Ao

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Sound represents mechanical vibrations of an elastic environment (solid, liquid or gaseous), which lead to creation of consistently alternating fields of compression and rarefaction so the same refers to ultrasound, though ultra sound has special features which are different from sound waves of audible range

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Ultrasound

Ultrasound – represents sound waves which appear in the frequency range from 20 KHz to 1000 MHz

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The ultrasound propagation obeys basic laws which are the same for acoustic waves of all frequency ranges

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In liquid and gaseous environments where the density variations are not significant, acoustic waves have longitudinal form which means that the particle oscillations are parallel to the wave propagation

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1 History

The research of high frequency oscillations began in 1876, when a British physician Francis Galton generated high frequency sound waves with the help of a device which later was called “Galton Whistle

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During recent years successful experiments were carried out in the fields of ultrasonic cavitation and acoustic flows, which allowed developing technological processes using ultrasound propagation in liquids

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In the solid objects and dense human tissue due to their inconsistent density there appear elastic shift deformations along with longitudinal waves what leads to transverse wave components formation (particle oscillations are perpendicular to the wave propagation direction

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Introduction

As long as ultrasound does not appear to be audible due to its high frequency bands the use of it in sound industry (music or film) is insignificant, though it is used for a huge amount of applications in science, industrial production and medical treatment

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2 Acoustic flow generated in carbon oil when exposed to a 5 MHz wave
In present time a new branch of chemistry is being developed- ultrasonic chemistry, as well as molecular acoustics

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