Near-field acoustic holography based reconstruction of sound field with coherent sound sources by single layer microphone array

A methodology of separation and reconstruction on holography surface of sound field caused by coherent sound sources based on spherical wave expansion based near-field acoustic holography is presented. A single layer microphone array is used to obtain the sound pressure on the measurement plane, the least-square method is applied to solve the coefficient vectors corresponding to the coherent sound sources. With the coordinates of the measurement points and the position information of the sound sources, the sound pressure on the measurement points sound source can be reconstructed, respectively. The methodology is validated and the accuracy of wave separation and sound field reconstruction is examined numerically in sound field with coherent spherical source and non-spherical source. The accuracy of reconstruction is also examined in anechoic chamber with two coherent speakers. The results of experiment show that the accuracy of reconstruction of sound field with spherical sources is higher than that with non-spherical source.