摘要
介绍一种用于水声材料低频声性能测量的驻波管测试系统。该系统采用双水听器传递函数法来测量材料样品在背衬下的低频反射系数 ,测量频率低于 1kHz,管子的内径为 85mm。文中首先对测量方法和系统构成作必要的说明 ,然后对水 空气自由界面的反射系数进行测量来验证本系统的测量方法 ,通过对均匀橡胶材料样品的测量 。
A standing wave tube measurement system is presented for measuring low frequency acoustic properties of underwater acoustic materials. The two hydrophones transfer function method is adopted to measure the reflection coefficients of the material samples under the backing. The measuring frequencies are below 1 kHz and the inside diameter of the tube is 85 mm Long. The measurement method and constitutions of the system are described first. Then the method has been verified by measuring the refection coefficients of air water free interface and the measurement uncertainty of the system also been analyzed by testing a homogeneous rubber sample.
出处
《计量学报》
CSCD
北大核心
2003年第3期221-224,共4页
Acta Metrologica Sinica
关键词
计量学
水声材料
低频声性能
反射系数
驻波管
Metrology
Underwater acoustic materials
Low frequency acoustic properties
Reflection coefficients
Standing wave tube
