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:

    “There is a sound of music echoing
    Through the open door
    And in the field there is
    Another sound tinkling in the cotton:
    Chains of bondmen dragging on the ground.”
    —Arna Bontemps (1902–1973)

    “How oft when men are at the point of death
    Have they been merry! which their keepers call
    A lightning before death: O, how may I
    Call this a lightning? O my love! my wife!
    Death, that hath sucked the honey of thy breath,
    Hath had no power yet upon thy beauty:
    Thou art not conquered; beauty’s ensign yet
    Is crimson in thy lips and in thy cheeks,
    And death’s pale flag is not advanced there.”
    —William Shakespeare (1564–1616)

    “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)