Acoustic Camera PLACID PACAM 64
Frequency, Aperture Size and Image Resolution
An acoustic camera produces an image where the intensity of each pixel represents the amplitude of acoustic waves coming from the corresponding direction. This is akin to an optical camera producing an image where each pixel represents the intensity of light coming from the corresponding direction.
- The sum signal corresponding to a any pixel position is available and can be streamed out of the processing engine to be listened to. This process is called “beamforming”. The microphone array can be digitally steered to the angle of incidence corresponding to any pixel in the field of view and focus on that source.
- A filter can be applied to the processing, such that the camera is only sensitive to certain frequencies. Furthermore, that filter can be adjusted in real-time, while the images are being captured.
- The integration time used to calculate the energy of the sum signal for each pixel can be adjusted. This is called the “persistence” of the image and is very similar to the concept of shutter speed for an optical camera.
- PACAM 64 is an 8×8 microphone array, and real-time beamformer. It can build a 32×32 pixel image of sound sources in real-time, with adjustable frequency response within 20 Hz to 8 kHz.
- Its massively parallel beamforming DSP allows the instrument to build each pixel concurrently with no missed sample.
- The instrument can be controlled, and the images can be retrieved using an open protocol based on virtual Com port.
- The instrument can stream audio to the host platform through a USB-Audio interface. Through that interface the instrument is seen by the host as a USB microphone.
- That USB-Audio interface works on any platform that has a generic USB-Audio driver. That includes Windows, Linux and Mac-OS.
- A complete Windows application is provided to operate the camera, view and record images of the sound source.
Value of an optical image
PACAM64 presents acoustic images, showing sound sources in the field of view of the instrument. But it does not show an optical image, so it is difficult to match acoustic hot zones with the actual pieces of equipment creating the noise.
Field of view (FOV)
The field of view of the optical camera is 80 deg x 43 deg. As the field of view of PACAM64 is adjusted, the relative size of the optical image will change accordingly
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Case studies, examples
The following files can be downloaded and played back from Instrument Manager (download link below):