Implementation of underwater cylindrical broadband near-field acoustic holography

Broadband acoustic holography intensity measurement(BAHIM) is a new technique developed for analysis of sound sources using near-field acoustic holography(NAH).It first evaluates complex sound pressure phases in a measured cylinder by using two sound intensity components perpendicular to each other,then NAH treatment is made.In this paper the BAHIM method is explained while following the steps needed to identify a noise source within an underwater cylinder.In addition,the derivation of a discrete algorithm for the holographic reconstruction formula in limited spatial range is shown.Key techniques such as algorithm realization and filtering are presented.The results of simulations are discussed.The research provides a foundation for the application of underwater cylindrical BAHIM to reconstruct sound fields and identify and locate noise sources.