SOUND INTENSITY: ADVANTAGES
Immunity to background sound:
A sound intensity probe measures only the component of the sound
tavelling parallel to the probe axis. Sound travelling toward the
probe is measured as positive intensity, while sound travelling
opposite to the direction of the probe registers as negative intensity.
When measurements are made with the probe over
an imaginary surface enclosing the source under test, background
sounds pass into one side of the enclosing surface and back out
the opposite side. In this way, the background sounds cancel out
and the measurement includes only the sound originating inside the
measurement surface. Room effects such as reverberation are eliminated
in the same way.
Measurement quality is improved by the inherent immunity to background
sound and to reverberation available through sound intensity methods.
Precision Grade or Engineering Grade measurements, in full accordance
with ISO and ANSI standards can be conducted in virtually any location
indoors or outdoors.
In the past, accurate sound power ratings of equipment required
that the device be shipped to an acoustical laboratory chamber.
Sound intensity methods offer the option of gathering highly accurate
measurements at your facility, in-situ, with little disruption to
processes or activities. On-site measurements offer time and cost
savings and can accommodate iterative testing for product research
and development applications.
Identification, Isolation and Ranking
Individual Sound Sources:
In reducing worker noise exposures inside an industrial plant, or
environmental noise emissions outdoors, sound intensity measurement
allows accurate identification, isolation and ranking of individual
sound sources. In this way, informed decisions can be made about
how much noise control each piece of equipment may require. For
complex machines and processes, the noisy components can be identified