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A two-dimensional microphone array is necessary to realize instantaneous measurements of sound fields. The array has a skeleton to hold many microphones, and the skeleton should be located near sound sources when the results of the measurements are applied to the method of nearfield acoustic holography. When spacings between the microphones would be small for a fine spatial resolution, bodies of microphones are approaching each other. In such a condition, sound waves reflected at the surfaces of the structure would become easier to reach to the microphones for measurements. As a result, measured distributions would be distorted by such disturbances. In this paper, an experimental procedure to investigate the effects of the array structure to the sound field is proposed. An actual array structure was constructed, and the effects added as deviations on the true values of complex sound pressures are measured experimentally with a scanning microphone. Then, relative complex deviations involved in the complex sound pressures are calculated and shown to evaluate the effects. Locations of reflecting surfaces that would cause the deviations are discussed with the values of lagged distances derived from the relative phase distributions. The methodology and results summarized in this paper would be worthy to develop the analysis to investigate the actual insertion effects of the array structure to the analytical applications such as the NAH.

An Experimental Study of Insertion Effects of 2-D Microphone Array to Measured Sound Field