Sound Power Level
is
a measure of the sound energy emitted from
a source of noise.
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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: |
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a.
location of the equipment; |
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b.
environmental conditions; and |
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c.
distance from the measurement point. |
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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. |
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|
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: |
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1. inside the anechoic or reverberant chambers (very
expensive); or |
|
2. in the acoustically free-field (in many cases
unattainable). |
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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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The
measurements of sound intensity are carried out over a close, imaginary box (of
any shape, e. g. a cuboid or rectangular parallelepiped, as in the diagram
on the left) surrounding a piece of equipment operating in situ.
Based on
these measurements, the sound power level of
the piece of equipment is
determined by the sophisticated analyser. |
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We carry
out our sound intensity measurements with
Brüel
& Kjær (B&K) Modular Precision Real-Time Sound Analyzers type 2260 with Sound
Intensity Probe type 3595
(state-of-the-art hand-held sound intensity
system). Using this system, the sound power level may be determined according to
ISO 9614-2 or ANSI S12.12. |
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