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基于相位共轭方法采用离散阵列对用于声源定位的相位共轭阵列参数进行了数值计算研究,研究了阵元间距、阵列面积、声源频率和阵列形式等对声场聚焦幅值和空间尺寸大小的影响。数值计算结果表明:采用平面阵列,为突破声波衍射极限,阵元间距应为△≤0.5λ,最优的阵元间距为0.15λ。在近场基于声压梯度测量使用偶极子源的相位共轭阵列,阵列边长满足a≥1.4λ即可,并且随着频率升高,相位共轭声场的幅值增大,得到的相位共轭分辨率降低。对于阵列形式,采用十字交叉阵列可用较少的阵元个数就可以突破衍射极限。如果阵列与声源为共形面,推导出相位共轭声场幅值与声源的辐射声功率成比例,文中还计算并验证了相位共轭声场幅值与辐射立体角的关系。
Based on the phase conjugation method, the parameters of the phase conjugate array used for sound source localization are numerically studied by using discrete arrays. The effect of array spacing, array area, sound source frequency and array form on the focusing amplitude and spatial size The size of the impact. The numerical results show that the plane array is used to break the sonic diffraction limit, the distance between array elements should be Δ ≤ 0.5λ, and the optimal array element spacing should be 0.15λ. In the near field, the dipole source phase conjugate array is used based on the sound pressure gradient measurement. The edge length of the array satisfies a≥1.4λ, and as the frequency increases, the amplitude of the phase conjugate sound field increases. The obtained phase Conjugation resolution decreases. For the array form, the use of a cross-array can be used less number of array elements can break through the diffraction limit. If the array and the sound source are conformal surfaces, the amplitude of the phase conjugate sound field is deduced to be proportional to the radiated sound power of the sound source. The relationship between the amplitude of the phase conjugate sound field and the solid angle of the radiation is also calculated and verified.