The Acoustic Camera from gfai tech GmbH was the first commercially usable system and came onto the market in 2001 as a pioneering technology.

Constant further developments enable measurements in the far and near fields by means of beamforming (time domain or frequency domain), intensity or holography. This opens up a wide field of activity for the Acoustic Camera. The system can be used to exactly localize sound sources from:

  • Smallest objects to large industrial plants
  • Stationary objects to objects quickly passing-by
  • Purely technical measurement objects to research on animals

From low-frequency signals up to ultrasound, sources are clearly detectable making the Acoustic Camera a universally applicable analysis system.

Two System Types

gfai tech offers different Acoustic Camera versions for different applications.

  • The Acoustic Camera system AC Pro
  • The all-in-one soundcam Mikado

 

 

All-in-one Mobile Acoustic Camera
Mikado

This new all-in-one Acoustic Camera consists of:

  • Microphone array
  • Data acquisition function and
  • Tablet with the software NoiseImage Mobile

Advantages of Acoustic Camera

  • Different microphone arrays for different applications
  • Detecting from low frequencies up to ultrasound
  • High sampling rates for short-impact analysis
  • Advanced algorithms for in-depth analysis
  • 2D and 3D acoustic spectral photos and movies
  • Professional expert system and mobile handheld soundcam Mikado

Frequently Asked Questions

Beamforming is the basic algorithm for our Acoustic Camera. The individual signals are summed and evaluated according to the different run times from the target to the microphone. This effectively suppresses interference and amplifies the measurement signal.
Beamforming works both in the time and frequency domain.

Delay and Sum Beamforming in time domain (TDBF)

Delay and Sum Beamforming in frequency domain (FDBF)

The choice of camera in the microphone array is important because it records the optical image or video of the measurement object during the acoustic measurement. By integrating the sound emission over a selected time and / or frequency interval, an acoustic photo or video can be created. The acoustic information is layed over the optical image of the camera, resulting in precise acoustic mapping.

This way, acoustic data is mapped on optical information. Resolution, opening angle and frame rate play a decisive role. For this reason, the choice of camera is very important and must be made to fit the respective application. The resulting acoustic photo offers the user various analysis and evaluation options.

In the future, Intel® RealSense™ depth cameras will be installed as standard in our microphone arrays. This camera offers a wide field of view and a global shutter that is ideal for fast moving objects. The sensors offer high light sensitivity so that images can be taken even in dark environments. This camera offers advantages for acoustic measurements where it is essential to see as much of the scene as possible.

Despite the wide angle lens, there is no cushion effect and the optics are equalized. But the biggest advantage is probably the possibility of taking a depth image directly. This allows the automatic acquisition of the depth of focus from one perspective and thus better analysis of sound sources at different distances. For example, the correct focus for each sound source in the image can be found automatically.

The depth Information is especially useful when sound sources are at different distances from the Acoustic Camera. Defining the focus plane in that case can lead to errors, since it is not the same focus for all sound sources. With this camera, the depth Information can be measure, so the focus can be adjusted for different distances.

Baumer camera are also used in our microphone arrays. These are particularly suitable for large arrays, such as wind tunnels, due to the longer cables required and the adaptable lenses. Also in the Fibonacci array we use a Baumer camera for holography applications because of the required fisheye lens. The wide angle has advantages when the measurements are carried out in the near field. By enlarging the visible area you get a better overview of the found sound sources.

We and our customers have already had very good experiences with the Baumer. If desired, this camera can also be installed in any other array. Baumer offers integrated fixed focus cameras, which are available as USB or Ethernet versions and also have a global shutter. Depending on the application, different sensor sizes, resolutions and frame rates are individually adapted.