I need to buy polarised transducers

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Polarized transducers emitting sound at 25kHz are discussed, with an initial claim that polarized ultrasound does not exist because sound waves are longitudinal. However, it is clarified that shear waves can be generated in liquids and solids, and hybrid waves like Lamb waves are recognized in ultrasonics. The conversation references ultrasonic methods used in non-destructive testing and imaging, highlighting the complexity of sound wave behavior. Links to relevant studies are provided for further reading. The discussion emphasizes the evolving understanding of sound wave properties in various materials.
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berkeman said:
There's no such thing as polarized ultrasound. Sound waves are longitudinal, not transverse.
Ah, not so! While is virtually impossible to generate shear waves in gases, shear waves are possible in liquids and solids, or basically any elastic material.

Sound can be induced as shear waves in addition to longitudinal waves. And there are hybrid waves (Lamb waves). All these are well known in the application of ultrasonics in non-destructive testing and imaging.

For example -
Ultrasonic methods for characterizing polymeric material
http://pubs.acs.org/hotartcl/ci/00/feb/alig.html

Generation of Horizontally Polarized Shear Waves with EMAT Transducers
http://www.ndt.net/article/0398/huebsch/hueb.htm

I'll see if I can answer the OP later.
 
Last edited by a moderator:
No kidding? I never knew that. Thanks, Astro, I learn something new every day, especially here on PF.:biggrin:
 

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