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本文分析了离散声全息成象系统中核心器件鉴相器特性不完善对重建图象的影响。从理论上分析了由鉴相器特性不完善造成 z 方向高阶象,结合离散接收造成的垂直于 z 方向的高阶象,在所要聚焦的平面上形成背景噪声。对这类高阶象进行分析,说明这类高阶象是畸变的,象物之间变换不是线性的。还导出了用计算机来校正鉴相器特性的方法。最后给出了计算机模拟计算的例子。
This paper analyzes the influence of imperfect phase detector of the core device on reconstructed image in discrete acoustic holographic imaging system. The high-order z-direction image caused by the imperfect property of the phase detector is analyzed in theory, and the high-order image perpendicular to the z-direction caused by discrete receiving is combined to form the background noise on the plane to be focused. The analysis of such high-order images shows that such high-order images are distorted, and the transformation between objects is not linear. A method of using a computer to correct the phase detector characteristics has also been derived. Finally, an example of computer simulation is given.