Air Holography

With more than 30 years’ experience in Automotive, Aviation, and Industrial applications, OROS presents a precise, flexible acoustical imaging system based on Near-field Acoustical Holography (NAH) with rugged and portable instruments. It is the ideal tool for sound source localization and quantification.

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The Air Holography solution offers highly accurate acoustic maps based on the sound pressure measured by a microphone array. It is the ideal tool for applications such as noise reduction, quantification of noise radiation, health monitoring, and quality control

Main Features


  • Best accuracy in noise source localization
  • Most operational process for capturing the real test situation (RELAX technology)
  • Source quantification and ranking via evaluating global and partial radiated power through user-defined polygonal patches
  • Estimation of the acoustic impact of local modifications on components
  • Geometry and results import/export to Matlab® offering flexible and extended processing capabilities
  • Calculator tool for results, perfect tool for benchmarking competing solutions


Sound Source Localization and Quantification

The Air Holography solution is found on Near-field Acoustical Holography (NAH). NAH is an experimental method which estimates a complex sound field, based on the sound pressure measured by a microphone array close to the test object. Compared with beamforming whose spatial resolution depends on frequency, NAH provides the highest spatial resolution for sound source localization at low to medium frequencies. Furthermore, NAH supports sound intensity calculation, enabling source quantification and source ranking via global and partial sound power computation.

Air Holography Software

The Air Holography software performs all the computational work involved in the NAH ranging activities:


  • Configuring the acquisition system and storing pre-processed data
    • Planar array definition and management
    • Test definition, acquisition setting
  • Performing basic and advanced data processing functions
    • Spectrum analysis (narrowband, octave band, user-defined band)
    • Acoustic pressure and intensity map
    • Source ranking and screening
  • Displaying results
    • Spectra, color maps, directivity diagrams
    • Linear, logarithmic, narrowband, octave
    • Export to MS Word and Matlab®

All our software solutions are customizable to be integrated in your environment. Please contact our the OROS Customer Care Department and visit the customization services webpage.