Acoustic Measurements and Product Testing
Here at Sonobex we take pride in our rigorous scientific approach to solving acoustic problems. With our help you will be able to quantify the acoustic parameters of your products and solutions, enabling you to meet strict noise legislation, and to understand the underlying mechanisms that cause noise problems in the first place, improving the acoustic design of your product.
We have access to world-leading acoustic facilities including:
Horizontal transmission loss suites
These facilities combined with our wide range of specialist measurement equipment also enables us to perform a variety of official tests in accordance with relevant industry standards. Additionally we are experienced in independent product test using specialised test rigs that can be designed to accommodate your products' needs.
Our methods cover both sound pressure and sound intensity measurement techniques, allowing Sonobex to undertake robust analysis not only in laboratory conditions but also in-situ or in the field. We can recommend the most suitable approach and methods for your requirements.
No matter how unusual your problem may seem, we are happy to help you solve it!
Transmission loss or Sound Reduction Index, R dB, is a measure of the effectiveness of a wall, floor, door or other barrier in restricting the passage of sound. The transmission loss varies with frequency and the loss is usually greater at higher frequencies. The higher the transmission loss of a wall, the better it functions as a barrier to unwanted noise.
We can characterise the sound insulation performance of your products and solutions.
Sound absorbers are used to dissipate sound energy and to minimise reflections. Sound energy is dissipated by simultaneous actions of viscous and thermal mechanisms. The absorption coefficient α is a common quantity used for measuring the sound absorption of a material and is known to be the function of the frequency of the incident wave.
We can characterise the sound absorption qualities of your products and solutions.
Sound Power Level
Sound power level is the acoustic energy emitted by a source which produces a sound pressure level at a specified distance. It is best to quantify a source in terms of the sound power level emitted because this does not change, whereas the resultant sound pressure level will depend upon how and where it is measured, which means that quantifying a source by the sound pressure level produced may leave considerable uncertainty in the actual sound energy of the source.
We can characterise the sound power level of your products.
Standardised Test Methods
BS EN ISO 10140:2010 – Laboratory measurement of sound insulation of building elements – resulting in a report with a single value of overall Sound Reduction Index (Rw) and presenting sound insulation values in 1/3rd octave bands from 50 Hz – 5 kHz.
Recommended test for acoustic panels, walls, doors, partitions, windows etc.
BS EN ISO 354:2003 – Measurement of sound absorption in a reverberation room – resulting in a report with a single value of weighted sound absorption coefficient and sound absorption coefficient values in 1/3rd octave bands from 50 Hz – 5 kHz.
Recommended test for acoustic panels, absorbers, wall or ceiling treatments etc.
BS EN ISO 3744:2010 – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane – resulting in a repot with a single value of sound power level Lw and sound power levels represented in 1/3rd octave bands between 50 Hz-10 kHz
Recommended test for household appliances, machines, devices etc.
BS EN ISO 9614:1996 – Determination of sound power levels of noise sources using sound intensity measurements by scanning – resulting in a report with a single value of sound power level Lw and sound power levels represented in 1/3rd octave bands between 50 Hz-10 kHz.
Recommended test for in-situ devices, machines and components etc.
Advanced Acoustic Measurements
Our advanced sound field visualisation techniques using acoustic camera makes it possible to gain in-depth knowledge about sound radiation from any device that generates sound. Utilising near field acoustic holography and beamforming to overlay an image of the device under test with a map of sound pressure levels, we can see and identify contributors of noise. Additionally taking measurements with a sound intensity probe we are able to detect and pinpoint sound leakage from your product.
In Early 2013, Merford Group was the first company in the Netherlands to utilise acoustic camera technology commissioned by Sorama. The Acoustics camera can be used both in the design stage of a product or in post production in order to detect noise problems.
The CAM1K is the top-of-the-line product in the Sorama assortment of sound cameras for companies that want to reduce noise and vibrations of their products and improve sound design.
- Digital MEMS microphone array with 1024 channels, with 64x64cm area
- 1 Power over Ethernet cable (15m included, max length 100m)
- 1 PoE injector with 220V power adaptor
- 1 integrated HD video camera
- Near- and far-field sound imaging ready
- Near-field frequency range: 1Hz – 20kHz
- Far-field frequency range: 50Hz-20kHz with optimal conditions at 300Hz – 15kHz
The camera and its software have been extensively tested and are used in the automotive, construction, manufacturing and machine equipment and household appliances such as heat pumps.
The principle of the acoustic camera is based on high quality MEMS microphones mounted in a grid of 64 or 1024 channels and use enhanced Near-field Acoustic Holography techniques. This allows the sound pressure level measurements between 1 to 20,000 Hertz to be anaylsed, but also the particle velocity and the sound intensity, which are also important noise metrics. The camera analyzes the sound spectrum, any localized sources and any change in sources and enables them to be visualised. The camera measures only the sound of the source under test and is unaffected by any background noise. The advantage of the camera is that the images are obtained in a short amount of time revealing insight into the dynamic properties of the test object. Immediately visible are the acoustic weak points in the structure; vibration, structural noise and sound leakage. Using this data Sonobex can develop targeted measures in advice and solutions.
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