【摘要】 阐述了一种新的水声无源材料声学性能实验室测量装置，测量频率范围10－100kHz，最大静水压至3．0MPa，被测材料样品典型尺寸为300×300mm~2。装置应用多基元平面换能器基阵，大面积声透明PVDF薄膜水听器以及宽带窄脉冲信号和现代信号处理技术，在小型压力罐中建立近似的平面波自由声场，测量材料声学性能随频率、静水压的变化规律。测量参数包括复反射系数（口声降低）、复透射系数（插入损失）、衰减系数、复声阻抗和纵波声速。通过对多种不同性能材料样品的测量分析，验证了本装置的测量能力，装置的稳定性考核表明其反射测量扩展不确定度为1．2dB，透射测量扩展不确定度为0．8dB。更多还原

【Abstract】 A new facility in a laboratory is described that measures the acoustic properties of underwater acoustical materials in the frequency range from 10-100 kHz, at hydrostatic pressure to 3.0 MPa. And the typical size of material sample is 300×300 mm~2. By using plane transducer arrays composed of many elements, two large acoustically transparent PVDF films hydrophones and broadband narrow pulses together with the technique of modern signals processing, an approximate plane-wave free field is built in a small pressure vessel. So, the variance of acoustic properties of material as a continuous function of frequency at a hydrostatic pressure can be obtained. The acoustic parameters include complex reflection and transmission coefficient (echo reduction and insertion loss), attenuation coefficient, complex acoustic impedance and sound speed. Measurements are made on a number of samples with widely varying properties to illustrate the capability of this facility. Its stability is also checked and the results show that the expanded uncertainty in reflection and transmission measurement is 1.2 dB and 0.8 dB.更多还原