intensity

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richard pickworth - 10 Jun 2005 13:16 GMT

if you know the far - field SPL, can you calculate the intensity using
characteristic impedance?
yours
Richard

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Eberhard Sengpiel - 10 Jun 2005 18:41 GMT

> 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/m²:

http://www.sengpielaudio.com/calculator-soundlevel.htm

The sound intensity J = p²/Z.

Kind regards

Eberhard Sengpiel
German forum for microphone recordings
and sound studio techniques
http://www.sengpielaudio.com

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Gordo - 10 Jun 2005 19:14 GMT

> 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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richard pickworth - 12 Jun 2005 17:40 GMT

thanks gordo
richard

>> 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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Natural Science Forum / Physics / Acoustics / June 2005

intensity