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表面阻抗法测量水声材料声反射系数误差分析

DOI: 10.11990/jheu.201408007

Keywords: 反射系数, 水声材料, 表面阻抗法, 矢量传感器, 边缘衍射效应, 误差分析

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Abstract:

针对采用单矢量传感器表面阻抗法对水声材料进行反射系数测量时产生的测量误差问题,从理论上系统地分析了表面阻抗法的误差来源、影响大小和测量不确定度.通过数值计算,重点分析了矢量传感器对材料边缘衍射效应的抑制作用,提出了规避其影响的方法,并讨论了发射声源和测量系统等参数对测量结果的影响.数值计算结果表明:基于矢量传感器的表面阻抗法对材料边缘衍射效应起到了一定抑制作用,测量结果优于双声压水听器法;表面阻抗法对矢量传感器各通道声压灵敏度误差和相位不一致性较敏感;在低频、大角度入射情况下表面阻抗法对测量系统参数误差较敏感.

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