A large range of modal decomposition method of the acoustic pressure field propagating in duct is available. In most cases, modes are assumed to be uncorrelated. In this paper, we introduce a deconvolution method for azimuthal and radial modal detection, considering that modes are correlated or not. This method is based on the iterative minimization of the discrepancy, in the least-square sense, between flush-mounted microphone measurements and an analytical model. In the first part, the deconvolution method is introduced, with underlying hypotheses. In the second part, in-house test bench is presented and the numerical evaluation of the identification accuracy is investigated. In the third part, our approach is applied to experimental measurements obtained with test bench. Numerical and experimental evaluations give promising results hut have to be proceed. Correlated modes hypothesis gives better results as reflections may occur at the end of the duct.
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