Tikhonov regularization method is effective in stabilizing reconstruction process of the near-field acoustic holography (NAH) based\non the equivalent sourcemethod (ESM), and the selection of the optimal regularization parameter is a key problem that determines\nthe regularization effect. In this work, a new method for determining the optimal regularization parameter is proposed.The transfer\nmatrix relating the source strengths of the equivalent sources to the measured pressures on the hologram surface is augmented by\nadding a fictitious point source with zero strength. The minimization of the norm of this fictitious point source strength is as\nthe criterion for choosing the optimal regularization parameter since the reconstructed value should tend to zero. The original\ninverse problem in calculating the source strengths is converted into a univariate optimization problem which is solved by a onedimensional\nsearch technique. Two numerical simulations with a point driven simply supported plate and a pulsating sphere are\ninvestigated to validate the performance of the proposedmethod by comparison with the L-curvemethod. The results demonstrate\nthat the proposed method can determine the regularization parameter correctly and effectively for the reconstruction in NAH.
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