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Applications in research
Contents:
  1. What is ultrasonic wave?
  2. Transducers
  3. OSA | Modulation of optical coherence by ultrasonic waves

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Buy this article in print. Measurements of the absorption of ultrasonic waves in water and ethyl alcohol were made by the pulse method, and are more accurate than those made by other methods.

Longitudinal wave and transverse wave

The measurements in water were made at frequencies between 7. The absorption decreased with increasing temperature by a factor of 8 between freezing and boiling points.


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The observed absorption was about three times that calculated from Stokes formula and this ratio was nearly independent of temperature. In ethyl alcohol measurements were made at The absorption decreased by a factor of 3 in this range and observed values were about twice those given by Stokes' formula.

What is ultrasonic wave?

In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric crystal that converts electrical energy electric current to mechanical energy sound waves. These sound waves are reflected and return to the transducer as echoes and are converted back to electrical signals by the same transducer or by a separate one. Alternately, one can generate ultrasonic waves by means of magnetostriction from magneto, meaning magnetic, and strictio, meaning drawing together.

In this case an iron or nickel element is magnetized to change its dimensions, thereby producing ultrasonic waves.

Ultrasound may also be produced by a whistle or siren-type generator. Privacy Policy Terms of Use. Sign in to access your subscriptions Sign in to your personal account.

Transducers

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OSA | Modulation of optical coherence by ultrasonic waves

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