How do Hoop Mode Transducers Work?

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Discussion Overview

The discussion centers around the operation of hoop mode transducers, specifically in the context of using a piezoelectric ring transducer for a sonoluminescence experiment. Participants explore the mechanics of sound energy transfer from the transducer to water and the implications of its orientation and mounting.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant is investigating the use of a hoop mode piezoelectric ring transducer mounted on a flat aluminum disc to generate sound waves in water for a sonoluminescence experiment.
  • The participant questions whether the mechanical movement of the transducer, described as perpendicular to the direction of the water, will effectively transfer sound energy into the water.
  • Another participant expresses uncertainty about the hoop mode transducer and requests a datasheet for clarification.
  • A different participant warns that sonoluminescence demonstrations often encounter challenges and suggests reviewing previous experiences of others in the field.

Areas of Agreement / Disagreement

There is no consensus on the effectiveness of the transducer's orientation for sound energy transfer, and multiple viewpoints regarding the operation of hoop mode transducers are present.

Contextual Notes

The discussion includes assumptions about the mechanical movement of the transducer and its relationship to water direction, which remain unresolved. The specific characteristics of the hoop mode transducer are not fully detailed, and the implications of its datasheet are not provided.

nst.john
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So I am looking to possibly use a ring transducer that has a hoop vibration mode to power a sonoluminescence experiment I am doing for school. I am attaching a picture of the set-up I have now and the aluminum disc in the picture is where I will epoxy the transducer so it can send sound waves into the water. My question is, if I lay lay a piezoelectric ring transducer on a flat aluminum disc and epoxy it, since it is in hoop mode which to me means that it will be having mechanical movement perpendicular to the direction of the water, will any sound energy be transferred to the water? Please help me I am very lost in my research right now. Thank you!
 
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Forgot to attach the picture, here it is:
 

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  • IMG_20160617_113152724.jpg
    IMG_20160617_113152724.jpg
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Is that the right picture?
 
Yes
 
I can't answer your question. But SL demonstration is more often than not marked by failure, it seems, so you would do well to read of the travails of others before diving in, e.g.,
http://techmind.org/sl

Good luck with it all.
thumbsup.gif
 
nst.john said:
since it is in hoop mode which to me means that it will be having mechanical movement perpendicular to the direction of the water,

i never messed with 'hoop transducer'

can you post its datasheet ?

And what does "perpendicular to the direction of the water" mean ? Perpendicular to plane of your flat disc ?
 

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