Sound Power - Sound Power Measurement

Sound Power Measurement

A frequently used method of estimating the sound power level at a source is to measure the sound pressure level at some distance, and solve for :

L_\mathrm{W} = L_\mathrm{p}-10\, \log_{10}\left(\frac{1}{4\pi r^2}\right)\, If the source is in free space

or

L_\mathrm{W} = L_\mathrm{p}-10\, \log_{10}\left(\frac{2}{4\pi r^2}\right)\, if the source is on the floor or on a wall, such that it radiates into a half sphere.

The sound power estimated this does not diminish or increase with distance, unless reflections are present.

Read more about this topic:  Sound Power

Famous quotes containing the words sound, power and/or measurement:

    “Everywhere “good men” sound a retreat, and the word has gone forth to fall back on innocence. Fall forward rather on to whatever there is there.”
    —Henry David Thoreau (1817–1862)

    “The British are a self-distrustful, diffident people, agreeing with alacrity that they are neither successful nor clever, and only modestly claiming that they have a keener sense of humour, more robust common sense, and greater staying power as a nation than all the rest of the world put together.”
    —Quoted in Fourth Leaders from the Times (1950)

    “That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
    —John Dos Passos (1896–1970)