Differentiating between shear and longitudinal acoustic waves in a solid

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SUMMARY

This discussion focuses on differentiating between longitudinal and shear acoustic waves in solids, specifically within optical fibers. It highlights the established method used by seismologists, which relies on the time of flight difference between the two wave types, as shear waves cannot propagate through liquids. The participant seeks alternative methods to identify these waves in a solid medium, indicating a need for innovative approaches beyond the conventional time of flight technique.

PREREQUISITES
  • Understanding of acoustic wave propagation in solids
  • Familiarity with longitudinal and shear wave characteristics
  • Knowledge of optical fiber properties
  • Basic principles of wave detection methods
NEXT STEPS
  • Research advanced techniques for measuring acoustic wave propagation in solids
  • Explore methods for detecting acoustic waves in optical fibers
  • Investigate the effects of tension on wave speed in solid materials
  • Learn about the use of piezoelectric sensors for wave detection
USEFUL FOR

Physics PhD students, materials scientists, and engineers working with acoustic wave applications in solid materials, particularly in optical fibers.

1jason.whatfo
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Hi there,

I should probably know this (attempting to do a PhD in physics!) but is there a way to differentiate between longitudinal and shear acoustic waves in a solid?

I know that seismologists know which is which by using the time of flight difference for the two types of waves and the fact that shear waves can't travel through liquids. But I'm trying to isolate which wave is which within a solid (an optical fibre) and cannot think of way other than the time of flight method which isn't able to solve the problem..


Any ideas would be appreciated.

Cheers,
J
 
Last edited:
Physics news on Phys.org
Can you increase the tension and measure the change (if any) in the propagation speed?
 
How do you detect the acoustic waves?
 

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