摘要
透射系数是水声材料的一项重要声学参数,为在水池中对水声材料的透射系数进行测量,提出基于脉冲压缩技术的测量方法,对接收信号进行压缩提取直达波。该方法不仅能克服实验过程中经常遇到的多途干扰,且测量过程简单,可同时获得测量频带内所有频点的透射系数,实现对透射系数的宽带测量。在水池环境下,通过对20～60 kHz频率范围内玻璃缸的窄带测量与宽带测量结果比较,验证该方法的有效性。
Transmission coefficient is one of the most significant parameters of underwater acoustic materials. In order to measure a transmission coefficient in a tank, a method based on pulse compression technique was proposed. With it, a directive wave was extracted from a compressed signal. The method could overcome unavoidable muhi-path disturbance in tests, and easily obtain transmission coefficients for all the frequencies in the measured frequency band simultaneously, i. e. , a wide-band measurement was realized. This method was verified through comparison between the results of narrow and wide-band measurements of a glass box, they were conducted in the frequency range of 20 -60 kHz in a tank.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第3期146-149,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(50909028)
关键词
脉冲压缩技术
透射系数
宽带
多途干扰
pulse compression technique
transmission coefficient
wide-band
multi-path disturbance
