中文摘要：

现有的水声管吸声系数测量的脉冲法,由于水声管高度的限制,存在低频限制。提出了基于＂后置＂＂逆滤波的宽带脉冲声测试方法,在测量获得系统的传递函数后,换能器发射宽频短脉冲信号,然后对接收到的标准反射体和待测样本的反射信号分别进行逆滤波处理,恢复未经传递系统＂污染＂的反射信号,计算待测样品的反射系数和吸声系数。仿真实验分析了＂后置＂逆滤波相对于传统＂前置＂逆滤波的在低频测试方面优势。对橡胶材料样品进行了实验测试,无论在低频段还是中高频段,宽带脉冲法和CW（Continuous Wave）脉冲法测试结果均吻合较好。宽带脉冲法是一种有效的测试方法,其低频测试能达到350 Hz,能有效拓展低频测试范围。

英文摘要：

The traditional underwater absorption coefficient measurement is limited in low frequency due to the lim- itation of the pulse tube length. A wide-band pulse tube method based on the ＂post-processing＂ inverse is proposed. The first procedure is to measure the response of the entire system for signal processing. Then, excite the transducer with wide-band, short-duration signals. Finally, process the received signals with the tested system transfer function and recover the ＂blurred＂ reflective signals of standard reflector and testing sample respectively. Simulation work was implemented to verify the advantage of ＂post-processing＂ inverse filter over ＂pre-processing＂ inverse filter in terms of low frequency measurement. To verify the proposed method, two different wide-band pulses of separate frequency range are adopted to measure the same rubber material. Experimental results indicate that wide-band pulse method and CW pulse method have good agreement in both low frequency range and high frequency range. Wide-band pulse method is of high efficiency, and the low frequency reaches 350 Hz. It can widen the low frequency range.