I am now developing the new sound localization method, the Double Near-field Acoustic Holography (DNAH) method. This method can localize the location of low frequency sound source precisely. In this method, the measurement plane of NAH method is doubled. To measure the sound information on the doubled measurement plane, two microphones which move vertically and horizontally are used. In former research, the distance between two microphones, the distance between two measurement planes is 0.2m. In this paper, the experiments are carried out with variable distance. As the result, it is verified that the DNAH method is also effective in the case that the distance between two microphones is short, several cm. Therefore, it is proved that the intensity probes can be used for measurement of DNAH method.
