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. 
 

What is sound intensity?

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.

By activating external content from Youtube, you consent to transmitting data to this third party.

Acoustic Camera: Real-time intensity mapping for low frequencies

Paddle2x24 AC Pro
24 double-layer channel system for low frequency application

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 dimensions34 x 32 x 16 cm
Weight1.2 kg
Video cameraBaumer VLG-22C (wide-angle lens)
Resolution1920 x 1080 (Full HD)
MicrophonesElectret condenser capsule
+ special designed preamplifier
Frequency response20 Hz – 15 kHz (< 0.5 dB)
10 Hz – 20 kHz (< 3 dB)
Max. sound pressure level130 dB at 3 % THD
Noise level27 dB(A)
Sensitivity20 mV/Pa
Channels48 (24 intensity probes)
Recommended measurement distance> 0.1 m
Acoustic maps from ...23 dB – 130 dB
Recommended mapping frequencies30 Hz – 2 kHz
Dynamic range9 dB – 23 dB
Ingress protection codeIP20
Cable length to data recorderUp to 20 m (on request: 50 m)
Operating environment0 °C to 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 mcdRec 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.

Paddle2x52 AC Pro
52 double-layer channel system for low frequency application

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.

read more
Array body dimensions71 x 35 x 16 cm
Weight1.6 kg
Video cameraBaumer VLG-22C (wide-angle lens)
Resolution1920 x 1080 (Full HD)
MicrophonesElectret condenser capsule
+ special designed preamplifier
Frequency response20 Hz – 15 kHz (< 0.5 dB)
10 Hz – 20 kHz (< 3 dB)
Max. sound pressure level130 dB at 3 % THD
Noise level27 dB(A)
Sensitivity20 mV/Pa
Channels104 (52 intensity probes)
Recommended measurement distance> 0.1 m
Acoustic maps from ...23 dB – 130 dB
Recommended mapping frequencies30 Hz – 2 kHz
Dynamic range9 dB – 25 dB
Ingress protection codeIP20
Cable length to data recorderUp to 20 m (on request: 50 m)
Operating environment0 °C to 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 mcdRec 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.