A Rotary Spiral Array Applied in Near-Field Acoustical Holography

Abstract:

This paper presents a new method to apply a spiral array in near-field acoustical holography (NAH). Usually, a NAH array needs much more microphones than a beamforming array does. Superior to a normal regular planar grid array or linear scanning array, this spiral array rotates to get more measuring data. Without a static referring microphone, a numerical method was designed to estimate the phase information measured at different time. Numerical simulations and a series experiment showed that this method is adequate for the sound below 450Hz. It is especially useful for using a random planar array at NAH mode, while the beamforming mode can only cover the higher frequency band.

• Periodical: Applied Mechanics and Materials (Volume 551)
• Pages: 202-209
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.551.202
• Online since: May 2014
• Authors: Lin Song Chen*, Yue Yun Cao, Wen Yong Guo
• Keywords: Acoustic Noise Localization, Beam-Forming, Equivalent Source Model, Spiral Array

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