| 郭文勇,陈林松,曹跃云.大孔径声全息密集阵列的阵元数量去冗余方法[J].,2017,36(3):205-211 |
| 大孔径声全息密集阵列的阵元数量去冗余方法 |
| The elimination of redundant sensors of acoustic holography array with dense sensor and large aperture |
| 投稿时间：2016-09-23 修订日期：2017-04-28 |
| 中文摘要: |
| 大孔径密集声全息阵列是实现对非平稳噪声成像的有效手段，通过现场快速成像可以掌握声场分布的动态特征。增加声阵列的孔径和阵元密度是提高近场声全息成像性能的主要措施，但随着声阵列阵元数量的增加，声压采集数据量增大，全息运算速度降低，全息成像动态性能下降，不利于现场即时成像分析。研究表明，在一定信噪比条件下，盲目增加阵元数量并不一定能提高近场声全息性能，为此，本文针对密集声全息阵列的阵元数量冗余问题进行研究，提出最优阵元数量估算方法，并采取去冗余处理。经过实验验证表明：针对一定信噪比条件下的密集阵列去冗余方法实际有效，可以在不降低近场声全息成像性能的前提下，降低运算量，提高全息成像速度，对于非平稳噪声的现场声全息成像测试具有实用意义。 |
| 英文摘要: |
| Large near-field holography array with dense sensors is an important tool for acoustic imaging of non-stationary noise. The dynamic character of the sound field can be imaged by high-speed field test. The main measures to improve the quality of the acoustic image are enlarging the array’s aperture and increase the density of the sensors. On the other side, the volume of data increase along with the sensor number, and decrease the imaging speed. The redundant sensors will harm the dynamic performance of acoustic image in field test. It is demonstrated in this paper that under certain noise level increasing sensor number blindly may not improve the quality of the acoustic image. For this reason, the phenomenon of redundant sensors about dense array is studied; the method to estimate the optimal number of the sensors is brought out and applied to eliminate the redundant sensors. Simulation analysis and experiment show that the way of eliminating the redundant sensors for dense array is effective; the amount of calculation is lessen and the speed of imaging is enhanced without reduce the quality of the acoustic image; it is useful for near-field acoustic holography for non-stationary noise in field test. |
| DOI：10.11684/j.issn.1000-310X.2017.03.003 |
| 中文关键词: 近场声全息,声成像,声阵列,冗余 |
| 英文关键词: near-field acoustic holography, acoustic imaging, acoustic array, redundant |
| 基金项目:国家自然科学基金项目51609251 |
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