摘要
本文提出了一种新的大面积水声无源材料声学性能测量技术，可以在小型消声水池中测量大面积材料的某些声学性能随频率变化规律。材料样品的典型尺寸为１０００ ｍ ｍ ×１０００ ｍ ｍ 左右，目前的测量频率范围为２ ．５ ～２０ｋ Ｈｚ，测量参数包括反射系数（ 回声降低） ，透射系数（ 插入损失） 等。对标准样品进行了性能测量，测量结果和平面波理论模型计算值有较好的吻合。
In this paper, a new technique for measuring the acoustic properties of underwater acoustical materials in the frequency range of 2.5～20kHz in an anechoic water tank is described. The typical size of material sample is about 1000mm×1000mm. And the acoustic parameters include reflection and transmission coefficients (echo reduction and insertion loss). Measurements are made on a standard sample and the results quite agree with the values of the theory. It shows that the measurement technique has a great potential for development.
出处
《计量学报》
CSCD
北大核心
1999年第4期308-313,共6页
Acta Metrologica Sinica
关键词
水声材料
信号处理
声性能
声学测量
自由场
Underwater acoustical materials
Signal processing
Acoustic properties
Acoustical measurements
