Research on patch near-field acoustic holography based on two-level iteration

Gaoquan Gu,Jing Zhang

doi:10.21595/vp.2020.21512

Abstract

In order to solve the “window effect” and “aperture repetition effect” caused by limited measurement aperture, a patch near-field acoustic holography method based on two-level iteration is proposed. After analyzing the principle and process of patch near-field acoustical holography based on orthogonal spherical wave, a patch near-field acoustical holography method based on two-level iteration is proposed. The validity of the method is verified by simulation and experiment. Compared with the reconstruction results of patch near-field acoustical holography based on orthogonal spherical wave, it shows the superiority of patch near-field acoustical holography based on two-level iteration.

Highlights

The near-field acoustic holography technology requires that the aperture of the holographic plane is more than 4 times of the plane area of the measured target [1]
When the holographic measurement aperture is about the same as the plane area of the target sound source, the patch near-field acoustic holography based on the orthogonal spherical wave can effectively reduce the influence of “window effect”, but when the holographic measurement aperture is smaller than the plane area of the target sound source, the reconstruction error is large
We propose a patch near-field acoustical holography based on two-level iteration

Summary

Introduction

The near-field acoustic holography technology requires that the aperture of the holographic plane is more than 4 times of the plane area of the measured target [1]. Making such a large aperture of the holographic measurement for a large-scale underwater acoustic source will cause a huge financial burden, and the organization of the measurement process needs too much human and material resources. In order to reduce the “window effect” in small measurement aperture, a patch near-field acoustic holography method based on two-stage iteration is proposed

Deduction process

Simulation analysis

Experimental design

Results

Conclusions