Acoustic holography is a powerful technique for determining the structural acoustic behavior of surfaces and the sound fields they emit, as well as the visulization of structure-borne sound. It can be used to generate acoustic maps of the sound pressure, sound intensity or particle velocity. Furthermore, it enables one to estimate all acoustic field the sound power radiated by a source, and its directivity pattern. The reconstruction accuracy of the acoustic field from the hologram plays a significant role in determining the performance of the system.
Both of our all-in-one soundcameras Mikado and Octagon are quick in locating sound sources using either beamforming or near field methods.
The Fibonacci microphone array represents a new array family. Due to its microphone configuration and the integrated Intel® RealSenseTM Depth Camera, the Fibonacci is suitable for standard beamforming as well as for near-field acoustic holography and far-field measurements.
The Fibonacci array represents a new array family allowing near field and far field measurements with the same hardware. The integrated Intel® RealSenseTM Depth Camera together with the Baumer camera provide optimal reference images. The application area of this array ranges from 30 Hz for holography measurements to 20 kHz for beamforming measurements. This array can be operated with the gt4 data recorder.
| Array body diameter | 79 x 79 x 17 cm |
| Weight | 9 kg |
| Video camera | Intel® RealSenseTM Depth Camera D435 |
| Resolution | 1920 x 1080 (Full HD) |
| Microphones | Electret condenser capsule + special designed preamplifier |
| Frequency response | 20 kHz – 60 kHz (< 15 dB) 100 Hz – 15 kHz (< 0.5 dB) 20 Hz – 20 kHz (< 3 dB) |
| Max. sound pressure level | 130 dB at 3 % THD |
| Noise level | 27 dB(A) |
| Sensitivity | 20 mV/Pa |
| Channels | 72/96 |
| Recommended measurement distance | SONAH: 10 – 20 cm HELS: 0 – 10 cm BF: > 0.8 m |
| Acoustic mapping range | 72 channels: 9 dB – 130 dB 96 channels: 8 dB – 130 dB |
| Recommended mapping frequencies | SONAH: 40 Hz – 2 kHz |
| Dynamic range (Distance to the source: 1 m; calculation points: 90.000) | 72 channels: 14 dB – 20 dB up to 50 dB with advanced algorithms |
| Ingress protection code | IP20 |
| Cable length to data recorder | up to 20 m (on request: 50 m) |
| Operating environment | 0 °C – 35 °C, up to 80 % RH (RealSense) 0 °C – 45 °C, up to 80 % RH (Baumer) |
For near field and far field applications
This array can be used for beamforming as well as for holography (HELS and SONAH) applications. Depending on the chosen method, the recommended measurement distance is between 0 and 10 meters. The area of application is between 30 Hz for holography measurements up to 25 kHz for beamforming measurements. Owing to the arrangement of microphones, near field and far field measurements can be conducted with only one array.
The array design is optimized to provide the highest spatial resolution as well as map dynamic possible given the number of microphones used. Additionally, the array design effectively minimizes partial reflections, sound pressure doubling effects on the surface, and resonance effects between the measured object and the array.
The microphones used are calibrated to ensure stable sound pressure levels (+/- 0.5 dB). The array is connected to the data recorder via differential SymBus microphone connector cables. This technology allows for long microphone cables (max. 20 m). The array comes as default with both an integrated Intel® RealSenseTM Depth Camera which features Full HD resolution and the ability to record depth information, and a Baumer camera. The included high-end Manfrotto tripod allows a set up in almost any measurement environment imaginable. Array and tripod are supplied in a transport case and bag, respectively.
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The Soundcam Mikado is perfect for troubleshooting sound and vibration problems. Mobile and wireless, this allows very flexible measuring positions and angles - and therefore fast and efficient identification of noise sources based on acoustic signals.
Easy to use and everything integrated in one device: from acoustic data acquisition to data analysis. Sound sources can be localized and analyzed in real time.
The Acoustic Camera Octagon delivers excellent holography results thanks to the high microphone density. With 192 MEMS microphones in an acoustically transparent frame, high precision with maximum dynamics is guaranteed. It is therefore the perfect solution for all demanding measurements for the localization of sound sources. Lightweight and robust, the Soundcam Octagon is manufactured in a sandwich carbon construction.
