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 :
If the source is in free space
or
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.
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Famous quotes containing the words sound, power and/or measurement:
“Monte Beragon: When Im close to you like this, theres a sound in the air like the beating of wings. Do you know what that is?
Mildred Pierce: No, what?
Monte Beragon: My heart, beating like a schoolboys.
Mildred Pierce: Is it? I thought it was mine.”
—Ranald MacDougall (19151973)
“First, there is the power of the Wind, constantly exerted over the globe.... Here is an almost incalculable power at our disposal, yet how trifling the use we make of it! It only serves to turn a few mills, blow a few vessels across the ocean, and a few trivial ends besides. What a poor compliment do we pay to our indefatigable and energetic servant!”
—Henry David Thoreau (18171862)
“Thats 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 (18961970)