声管中利用双水听器的方法测量不同材料和结构的声反射系数,在此过程中将产生特殊的非辐射振动干扰,该干扰会影响测量精度。之所以会出现这种现象是因为声源与管壁之间是机械连接,在计算的基础上,估算薄空气层的干扰级和声反射系数。确定每一个频率上的声反射系数实际上是不可能的,这里我们采用两种方法降低干扰:方法一,合理的选取声管的结构单元;方法二,在信号处理的基础上,在声管中设置振动传感器和标准水听器。 The use of double hydrophone sound tube sounding method of measuring different materials and structures, in the process will have a special non-radiative vibration interference, the interference will affect the measurement accuracy. The reason why this phenomenon occurs because the sound source and the pipe wall is a mechanical connection between the calculation based on the estimation of thin air layer interference level and acoustic reflection coefficient. Determining the acoustical reflectance at each frequency is practically impossible, and here we use two methods to reduce the interference: Method one, a reasonable choice of structural elements of the acoustic tube; Method two, based on the signal processing, in the acoustic tube In the set vibration sensor and standard hydrophone.