Near-Field Acoustic Camera
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Sound Intensity Probes
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Particle Velocity Sensors
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Sound Sources | VVS
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Portable Measurement Devices
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Sound Source Localization
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Acoustic Material Testing
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Sound Power & Source Ranking
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End of line testing software
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Acoustic Testing Software
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Sensor Arrays
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Preamplifiers & Frontends
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Accessories
Sound visualization with unmatched dynamic range
The Near-Field Acoustic Camera excels in the localization and quantification of non-stationary sound sources. Our system stands apart from traditional techniques by employing an array of PU sound intensity probes that capture more than just sound pressure. As a result, the Near-Field Acoustic Camera delivers precise acoustic emission results as well as detailed noise localization maps across the full audible frequency range. It accomplishes this while simultaneously maintaining an exceptional dynamic range, achieving unparalleled spatial resolution even for low-frequency noise sources.
Features
- Frequency range 20Hz - 10kHz
- Large dynamic range | up to 45 dB
- High, frequency independent, spatial resolution
- Applicable in (real) operating environments
- Visualization of transient & non stationary sound fields
- Extensive order analysis tools
Applications
- Squeak & Rattle noise
- Vehicle acoustics
- Component testing
- Powertrain NVH
- Benchmarking appliances
Curious About Pricing Details?
Unparalleled low-frequency sound localization in the near-field
The Microflown Acoustic Camera employs advanced algorithms for precise transient noise visualization. Through near-field acoustic holography, it reconstructs the emitted sound field, ensuring a consistent spatial resolution across the entire audible frequency range. Each probe in the array contains a microphone and a particle velocity sensor, capturing essential data for tackling complex acoustic challenges. This array benefits from measuring near the sources, ensuring high spatial resolution results even for low frequencies.
SOUND SOURCE LOCALIZATION AND QUANTIFICATION OF ACOUSTIC EMISSION
The near-field acoustic camera effectively analyzes and localizes complex sound sources. Thanks to the physical properties of particle velocity, our systems are robust against high levels of background noise. Therefore, we can derive accurate sound intensity and sound power results, even in testing environments with a high sound pressure to sound intensity ratio (P/I index). This distinctive property positions our system as an outstanding engineering resource for troubleshooting, benchmarking, or quality assurance of various objects in their target environment.
An Acoustic Camera with Multiple sensor array configurations
Our Near-field Acoustic Camera offers several hardware accessories and grids suitable for any challenge. Its versatility ranges from custom configurable setups, surface mounted probes to state-of-the-art handheld array solutions.
SOFTWARE CAPABILITIES
- NAH | Near Field Acoustic Holography
- ORDER TRACKING AND ANALYSIS
- SOUND POWER MEASUREMENTS
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In addition to the conventional Direct-Sound-Visualization (DSV), our system provides an advanced optional processing method, Near Field Acoustic Holography (NAH). NAH allows for refined interpolation and heightened resolution in the resultant sound field visualizations, while also permitting the extension of the measurement plane for calculations nearer to or further from the actual measured plane. Both techniques can display absolute values for a variety of parameters including sound pressure, particle velocity, sound intensity, and sound power. The versatility of the Acoustic Camera array, with its dual visualization capabilities, enables its use as either a planar array or a scattered array, with sensors randomly dispersed around the noise source's surface. This flexibility broadens the scope of application: for rapid measurements, a planar array combined with NAH processing offers prompt, effective results, whereas for a detailed analysis of complex issues in a noisy backdrop, positioning the sensor close to the measurement surface and implementing DSV processing produces the most comprehensive outcomes.
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Our system comes integrated with a comprehensive order analysis module, designed to track rotational orders, with or without a tacho sensor. The Order Tracking Module excels at studying rotating machinery by analyzing the frequency content of a signal relative to the rotation speed. A standout feature of this module is its ability to extract rotational orders without requiring the RPM signal, executed with a mere few mouse clicks. Users need only to identify and highlight a known order in the spectrogram of a captured sound signal. A proficient algorithm then pursues the order, converting it into a tacho signal. This synthesized tacho signal can then be employed to determine the distribution of any additional orders of your choosing, clearly visualized in a user-friendly ordergram.
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Leveraging the distinctive features of the Microflown sensor, in-situ sound power measurements are now achievable even in acoustically challenging settings. The Acoustic Camera is outfitted with PU probes, each designed to simultaneously measure sound pressure and particle velocity at the exact same temporal and spatial point. Sound intensity is deduced from the time-averaged product of these two parameters. With a known measurement area, the software can present real-time distribution of sound power across a wide frequency spectrum (20 Hz - 10 kHz). Additionally, the unique aspects of particle velocity lessen the need for acoustic adjustments in the measurement setting. Consequently, precise sound power results can be captured in-situ or in industrial manufacturing scenarios. This breakthrough simplifies benchmarking and quality control like never before.
Frequently asked questions
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An acoustic camera is a measuring tool that allows us to 'see' sound. Imagine how we visualize the ripple patterns when a stone is thrown into a pond. Similarly, an acoustic camera uses an array of microphones to pick up sound waves from different directions. By processing these waves with signal processing techniques like beamforming or acoustic holography, the camera determines where the sound is coming from. This technology overlays these sound emission from each particular direction onto a visual image, letting us view the noise sources.
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Near-field Acoustic Holography enables the rendering of a full description of the sound field to provide insight into how the acoustic output or the structural vibration of a source is coupled to the surrounding fluid medium. Generally, a discrete number of acoustic observations are measured over a two-dimensional plane or "aperture". Measuring sound and pressure and particle velocity allows to fully characterize the sound field, enabling the separation of incoming and reflected sound waves.
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By adding a combination of sound pressure and particle velocity sensors, a PU probe array can accurately quantify the acoustic emission of sound sources via sound intensity and sound power. In addition, acoustic holography imaging results are more accurate when using near-field data from pressure and particle velocity.