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Acoustic Intensity

Acoustic Intensity Testing involves measuring the sound energy flowing into, or outward from a specified area. for example, a compressor for use on a submarine may be too loud to pass acceptance tests. We use acoustic intensity testing to identify, map out, and make a ranking of, areas of high sound power on the compressor system. From this mapping of areas of high sound radiation we can then model solutions and develop a set of acoustic modifications and treatments that will allow the compressor to meet and exceed design goals.

The acoustic intensity has units of sound power per unit area. The measurement of acoustic intensity involves using a matched set of microphones held a given distance apart. The delay time in sound passing between the microphones allows for the calculation of the flow of sound energy. If we measure over a given area we can then calculate the sound power radiating out of, or being absorbed by, a surface, or gap.

We often look at the spectra of the sound and its waveform to understand the acoustic issue.
sound room noise monitoring

We often look at the spectra of the sound and its waveform to understand the acoustic issue.

acustic intensity graph

Acoustic intensity is also useful in finding sound leaks between rooms, or between floors. We are often asked to increase privacy in office space and meeting rooms.

acoustic intensity mapping

Acoustic intensity mapping allows us to find hot spots and gage the incremental effect of eliminating each leak. This allows us to offer the most cost effective solution to acoustic noise issues involving sound leakage.

surface area sub-divided into small test areas fo sound power assessment
acoustic intensity zone location map in office for walls and floor

Acoustic intensity is also used to document the total sound power radiated by a product. There are many standards that require the measurement of sound power. Acoustic intensity mapping allows for in–place/on–site, testing without the need to use an anechoic chamber.

octave band center frequency
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