Résumé du séminaire du 10 septembre 2007


G. V. ANAND - Localisation of acoustic sources using vector sensors

The currently developing technology of acoustic vector sensors (AVS) has several potential applications. Unlike conventional acoustic sensors such as microphones and hydrophones which measure acoustic pressure, the AVS makes simultaneous measurements of acoustic pressure and the three orthogonal components of particle velocity at a point. Thus AVS measurements provide a more comprehensive description of the acoustic field which is very useful in several applications. For example, a single AVS can estimate the direction of an acoustic source in free space or half space. Sparse AVS arrays with a small number of sensors can localise acoustic sources more accurately and efficiently than larger and denser arrays of microphones / hydrophones. This talk will provide a brief introduction to the theory of acoustic vector sensor measurements and present the results of some recent research on localisation of acoustic sources in air and under water using an AVS array.

References:
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2. K.T. Wong and D. Zoltowski, "Closed. Form underwater acoustic direction finding with arbitrarily spaced vector hydrophones at unknown locations", IEEE J. Ocean Eng. 22, 566-575 (1997)
3. B.A. Cray and A.H. Nuttall, " Directivity factors for linear arrays of velocity sensors", J. Acoust, Soc. Am. 110, 324-331 (2001)
4. M. Hawkes and A. Nehorai, "Wideband source localisation using a distributed acoustic vector-sensor array", IEEE Trans. Signal Processing 51, 1479-1491 (2003).
5. K. Kim, T.B. Gabrielson and G.C. Lauchle, "Development of an accelerometer based underwater acoustic intensity sensor", J. Acoust. Soc Am. 116, 3384-3392 (2004)