Different from the standard beamforming approach the measurement of the sound intensity with our paddle arrays covers even very low frequecies down to 30 Hz. Together with our data recorder the paddle array forms a complete sound intensity measuring instrument for fast and easy acquisition of acoustic intensity maps.
Sound intensity describes the sound energy per area and has the unit [W/m²]. It can be calculated from the pressure gradient of an intensity probe - two microphones that are aligned on the same axis in a short distance. This is called the Two-Microphones-Measurement Method. Our paddle arrays are grids of either 24 or 52 intensity probes (48 / 104 microphone channels) and therefore allow to localize sound sources based on sound intensity in the near field. The results are similar to acoustic maps produced with standard beamforming techniques.
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Acoustic Camera: Real-time intensity mapping for low frequencies
This portable handheld paddle features 48 double-layered microphone channels that allow real-time acoustic near field measurements. The double-layer structure enables the measurement of acoustic pressure signals while particle velocity/acoustic intensity on the measurement plane is calculated and mapped simultaneously.
| Array body dimensions | 34 x 32 x 16 cm |
| Weight | 1.2 kg |
| Video camera | Baumer VCXG-25C (wide-angle lens) |
| Resolution | 1920 x 1080 (Full HD) |
| Microphones | Electret condenser capsule + special designed preamplifier |
| Frequency response | 20 kHz – 60 kHz (< 15 dB) 20 Hz – 15 kHz (< 0.5 dB) 10 Hz – 20 kHz (< 3 dB) |
| Max. sound pressure level | 130 dB at 3 % THD |
| Noise level | 27 dB(A) |
| Sensitivity | 20 mV/Pa |
| Channels | 48 (24 intensity probes) |
| Recommended measurement distance | > 0.1 m |
| Acoustic mapping range | 23 dB – 130 dB |
| Recommended mapping frequencies | 30 Hz – 2 kHz |
| Dynamic range | 9 dB – 23 dB |
| Ingress protection code | IP20 |
| Cable length to data recorder | up to 20 m (on request: 50 m) |
| Operating environment | 0 °C – 45 °C, up to 80 % RH |
Easy to handle: the ultimate low frequency measurement tool.
The double-layered microphones act like intensity probes, delivering a vector used to calculate an acoustic map. The paddle is available as an add-on to an Acoustic Camera system or as a stand-alone solution. The calculation kernel for acoustic near field calculations is embedded in NoiseImage.
The design of the paddle is lightweight and allows for easy handling. The array body is designed as slim as possible, ensuring accurate microphone positioning. The wiring of the microphones is enclosed in and protected by the array body which guarantees the best possible acoustic transparency to measure accurate sound levels. Additionally, the array design effectively minimizes partial reflections and resonance effects between the measured object and the array. Furthermore, the microphone layout facilitates a differentiation between noise sources on the measurement plane and in the field behind the paddle.
The built-in studio microphones have an extremely linear frequency response. All are carefully hand selected and calibrated to ensure stable sound pressure levels (+/- 0.5 dB). To allow long distances, the array is connected to the data recorder via two differential SymBus microphone connector cables (max. 20 m). The array comes with an integrated fixed focus Ethernet camera with a wide angle lens. 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.
This portable handheld paddle features 104 double-layered microphone channels that allow real-time acoustic near field measurements. The double-layer structure enables the measurement of acoustic pressure signals while particle velocity/acoustic intensity on the measurement plane is calculated and mapped simultaneously.
This array can be operated with the mcdRec data recorder.
| Array body dimensions | 71 x 35 x 16 cm |
| Weight | 1.6 kg |
| Video camera | Baumer VCXG-25C (wide-angle lens) |
| Resolution | 1920 x 1080 (Full HD) |
| Microphones | Electret condenser capsule + special designed preamplifier |
| Frequency response | 20 kHz – 60 kHz (< 15 dB) 20 Hz – 15 kHz (< 0.5 dB) 10 Hz – 20 kHz (< 3 dB) |
| Max. sound pressure level | 130 dB at 3 % THD |
| Noise level | 27 dB(A) |
| Sensitivity | 20 mV/Pa |
| Channels | 104 (52 intensity probes) |
| Recommended measurement distance | > 0.1 m |
| Acoustic mapping range | 23 dB – 130 dB |
| Recommended mapping frequencies | 30 Hz – 2 kHz |
| Dynamic range | 9 dB – 25 dB |
| Ingress protection code | IP20 |
| Cable length to data recorder | up to 20 m (on request: 50 m) |
| Operating environment | 0 °C – 45 °C, up to 80 % RH |
Easy to handle: the ultimate low frequency measurement tool.
The double-layered microphones act like intensity probes, delivering a vector used to calculate an acoustic map. The paddle is available as an add-on to an Acoustic Camera system or as a stand-alone solution. The calculation kernel for acoustic near field calculations is embedded in NoiseImage.
The design of the paddle is lightweight and allows for easy handling. The array body is designed as slim as possible, ensuring accurate microphone positioning. The wiring of the microphones is enclosed in and protected by the array body which guarantees the best possible acoustic transparency to measure accurate sound levels. Additionally, the array design effectively minimizes partial reflections and resonance effects between the measured object and the array. Furthermore, the microphone layout facilitates a differentiation between noise sources on the measurement plane and in the field behind the paddle.
The built-in studio microphones have an extremely linear frequency response. All are carefully hand selected and calibrated to ensure stable sound pressure levels (+/- 0.5 dB). To allow long distances, the array is connected to the data recorder via two differential SymBus microphone connector cables (max. 20 m). The array comes with an integrated fixed focus Ethernet camera with a wide angle lens. 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.
