Attenuation coefficient of water

  • Thread starter lavster
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  • #1
lavster
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I have read that the attenuation of water (for ultrasound) is 0.0472 Np m–1
(MHz)–2.

What is this in dB/cm/MHz^-2 ? What is Np?

thanks
 

Answers and Replies

  • #2
davenn
Science Advisor
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Np = Neper, its another way of describing attenuation loss

see this wiki for a longer explanation
http://en.wikipedia.org/wiki/Neper

there's sure to be converters on the net to do the conversion between Neper and dB
Google is your friend :)

Dave
 
  • #3
lavster
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thanks :)
 

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