Sound Power Level
is a measure of
the sound energy
emitted from a source of noise.
The advantage of using the sound power
level, rather than the sound pressure level,
in reporting equipment noise is
that
the sound power is an inherent property of
the equipment - it does not depend on
the:
|
|
(a) |
location of the equipment;
|
|
(b) |
environmental conditions;
and |
|
(c) |
distance from the measurement point.
|
The sound power level
(and not the sound pressure level)
should be an essential part of modern technical specifications of any
equipment that may cause environmental and/or occupational noise problems. |
|
Traditionally, the sound
power level has been determined
by measurements of the sound pressure level of a
piece of equipment that needs to be placed during these measurements: |
|
(1)
inside the anechoic or reverberant chambers (very expensive) or |
|
(2) in
the acoustically free-field (in many cases unattainable). |
|
Today, using state-of-the-art
sound intensity technology,
sound power level of
your product or equipment that you use
may be determined in-situ, in your laboratory or factory, without
any special arrangements. |
|
During sound intensity
measurements your equipment may operate at any location. Furthermore, sound
intensity measurements eliminate steady extraneous noise (background noise),
which means that you do not need to stop other, nearby equipment during the
measurements. |
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