基于激光偏转效应的水下邻域声场重建方法  

Underwater Neighborhood Sound Field Reconstruction Method Based on Laser Deflection Effect

作　　者：甄旖璠 薛彬 Zhen Yifan;Xue Bin(School of Marine Science and Technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学海洋科学与技术学院,天津300072

出　　处：《激光与光电子学进展》2024年第5期98-107,共10页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2022YFC3104600);国家自然科学基金(62075162,62001329)。

摘　　要：水下邻域声场的高精度重建对研究分析邻域声场结构特点和提升水声传感性能有重要意义。在激光束宽度远小于声波波长的条件下,激光束穿过声场的偏转效应既携带了声场声压信息,也携带了梯度信息,这为直接引入Kirchhoff积分定理进行声场重建计算提供了数据传感基础。在此基础上,利用激光传感声场的稠密性,引入虚拟扩展声场孔径的计算方法,进一步接近了Kirchhoff积分定理对无穷大积分区间的理论要求。在水下邻域空间,对提出的声场重建思路和方法进行了验证。实验结果表明,与直接进行声全息的方法相比,所提声场重建方法的峰值信噪比提高了约5.5 dB,为高精度邻域声场传感器的开发提供了可行新思路。The high-precision reconstruction of an underwater neighborhood sound field is crucial for studying and analyzing the structural characteristics of neighborhood sound field and improving the underwater acoustic sensing performance.The deflection effect of the laser beam passing through the acoustic field carries the gradient and pressure information of the acoustic field when the laser beam width is much smaller than the acoustic wave wavelength.This study provides a data sensing basis for sound field reconstruction by employing the Kirchhoff integral theorem.The calculation method of a virtual extended acoustic field aperture is presented herein by using the density of the laser sensing acoustic field,which further approaches the theoretical requirement of the infinite integral interval in the Kirchhoff integral theorem.The results of the proposed sound field reconstruction ideas and methods are verified in an underwater neighborhood space.The results show that,compared with direct acoustic holography,the proposed acoustic field reconstruction method improves the peak signal-to-noise ratio by 5.5 dB,thereby providing a new feasible idea for developing high-precision neighborhood acoustic field sensors.

关 键 词：激光偏转 光学声场重建 声全息 边界延拓 

分 类 号：O426.3[理学—声学]