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richard pickworth
science forum beginner
Joined: 08 May 2005
Posts: 18
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 Posted: Fri Jun 10, 2005 12:16 pm Post subject:
intensity
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if you know the far - field SPL, can you calculate the intensity using
characteristic impedance?
yours
Richard |
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Eberhard Sengpiel
science forum beginner
Joined: 04 Jun 2005
Posts: 13
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| Posted: Fri Jun 10, 2005 3:41 pm Post subject:
Re: intensity
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richard pickworth <richard.pickworth@btopenworld.com> wrote:
| Quote: | if you know the far - field SPL, can you calculate the intensity
using characteristic impedance?
|
Hello Richard,
if there is given a sound pressure level SPL
you find here the sound pressure in Pascals and the
sound intensity in Watts/mē:
http://www.sengpielaudio.com/calculator-soundlevel.htm
The sound intensity J = pē/Z.
Kind regards
Eberhard Sengpiel
German forum for microphone recordings
and sound studio techniques
http://www.sengpielaudio.com |
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Gordo
science forum beginner
Joined: 01 May 2005
Posts: 20
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| Posted: Fri Jun 10, 2005 4:14 pm Post subject:
Re: intensity
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richard pickworth wrote:
| Quote: | if you know the far - field SPL, can you calculate the intensity using
characteristic impedance?
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Yes. In the far-field, where p and v are in-phase, p=rho*c*v, and I=p*v (or
half that quantity if one has peak rather than rms values). |
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richard pickworth
science forum beginner
Joined: 08 May 2005
Posts: 18
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| Posted: Sun Jun 12, 2005 4:40 pm Post subject:
Re: intensity
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thanks gordo
richard
"Gordo" <gordo20878@hotmail.com> wrote in message
news:U_SdnU6WxKsLRTTfRVn-rw@comcast.com...
| Quote: | richard pickworth wrote:
if you know the far - field SPL, can you calculate the intensity using
characteristic impedance?
Yes. In the far-field, where p and v are in-phase, p=rho*c*v, and I=p*v
(or half that quantity if one has peak rather than rms values).
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