LW db?

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en jag känner råkade ut för ett diagram med en skala märkt LW db
känner igen det men kan inte placera vad det står för
någon som vet?

diagrammet finns här
http://home.tiscali.se/hakan.lanner/index.html
under teknik / rpm db


Re: LW db?
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Lw = Sound Power Level -- The acoustic power radiated from a given sound source
as related to a reference power level (typically 10^-12 watts) and expressed in
decibels (dB) as:

Lw = 10log(W/10^-12) dB

or

Lw = 10log W + 120 dB

where:

W = Acoustic power in watts

By definition, one Watt therefore corresponds to 120 dB for Lw.

/ mw


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