Damaging levels of ultrasound?

Noral D. Stewart noral at ix.netcom.com
Wed Nov 7 04:58:52 EST 2001


Nic Phillips wrote:
> 
> I know that sound frequencies and levels that are damaging to humans have
> been discussed on here previously, including the 16Hz odd frequency that
> makes you want to go to the loo.
> 
> However, I was wondering if anybody knew more details on the effects of
> ultrasound on the body.
> 
> My example is that a sine wave with a frequency of 4kHz at 160dB is very
> damaging to human hearing, but you will also be able to hear that sound
> before your hearing is ruined.
> 
> What happens when you have a frequency of say around 30kHz, above human
> hearing but at a level that would be damaging within the 16-16kHz range.
> 
> 1. Is the ear able to respond to any frequencies above 20kHz?
> 2. Is the 20kHz (or 16 or whatever) limit the limit of the brain? Inner ear?
> Ear drum?
> 
> Thanks for any advice or pointers that anybody can give me about any
> damaging effects of ultrasound.
> 
> Nic Phillips
> 
> PS. Please remove NOSPAM if replying directly to me.
I am forward this to the newsgroup bionet.audiology where a different
group with a possibly higher probability of a good answer might be.




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