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Near Field Acoustic Holography

Compressed Sensing for Near Field Acoustic Holography

What is Near Field Acoustic Holography ?

Near Field Acoustic Holography (NAH) aims at reconstructing the vibro-acoustic field of a structure from a recording of the close wave field emmited by the vibrating structure. The wave field recorded is then numerically time reversed to reconstruct the distribution of the sources on the source plan. NAH is widly used for the vibration monitoring and control within car industry and aeronautics

Two main difficulties come with this technique :

1) the necessity of using a regularization procedure (to compensate the low pass filtering effect from the propagation)

2) the high number of measures to fulfill Shannon-Whittaker sampling theorem.

Our goal in ECHANGE

We take advantage of the sparse nature of the acoustic wave to apply CS at NAH.


Recording of a vibrating structure

After building a theoretical framework and specifying the geometry of CS microphone arrays for NAH we ran experiments with a 120 microphone array.

The use of a priori information on the sparse nature of the acoustic wave increased the quality of the results, decreased the acquisition time and the number of sensors used in the experiment.

The experiments ran so focused first on a rectangular plate, then on more complex shapes (like cutted circles or a guitar board).

Imaging the modes of a guitar board with Compressive Nearfield Acoustic Holography. See also NACHOS, our reproducible code for CS applied to NAH

(photo: B. Arnaldi)



Journal paper

Simulation and algorithmic aspects(in french)

 Experimental aspects (in french):

Code & data for  reproducible research


Mlle Stéphanie LEMAILE
Equipe-Projet METISS, IRISA
Campus de Beaulieu
F-35042 Rennes cedex, France.

PHONE: +33 2 99 84 72 52
FAX: +33 2 99 84 71 71