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在水声声管中用双水听器传递函数法测量水声材料的复反射系数。本文研究了传递函数的特点，提出了等反射系数曲线和等相位角曲线，还研究了传递函数的测量误差和复反射系数的计算误差，得出的结论是：合理选择双水听器位置参数，提高系统信噪比，修正水中声速，并采用交换通道法，在所要求的频率范围内使测量结果达到一定精度。文章还给出测试实例，与经典的驻波法结果一致。
Measurement of complex reflection coefficient of acoustical materials by acoustical acoustic double pipette transfer function method. In this paper, the characteristics of the transfer function are studied. Equal reflectance curve and equal phase angle curve are proposed. The measurement error of the transfer function and the calculation error of the complex reflection coefficient are also studied. The conclusion is: , Improve the signal to noise ratio of the system, correct the speed of sound in water, and adopt the exchange channel method, make the measurement result reach a certain precision within the required frequency range. The article also gives a test example, consistent with the results of the classic standing wave method.