基于脉冲压缩技术的宽带反射系数测量方法

doi:10.3969/j.issn.1000-1093.2012.08.009

兵工学报 ›› 2012, Vol. 33 ›› Issue (8): 951-955.doi: 10.3969/j.issn.1000-1093.2012.08.009

基于脉冲压缩技术的宽带反射系数测量方法

于盛齐，宋扬，黄益旺

（哈尔滨工程大学水声技术重点实验室, 黑龙江哈尔滨 150001）

收稿日期:2011-06-30 修回日期:2011-06-30 上线日期:2014-03-04
作者简介:于盛齐(1985—)，男，博士研究生

A Wide-band Method for Measurement of Reflection Coefficient Based on Pulse Compression Technique

YU Sheng-qi， SONG Yang， HUANG Yi-wang

(Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, Heilongjiang, China)

Received:2011-06-30 Revised:2011-06-30 Online:2014-03-04

摘要/Abstract

摘要： 反射系数是材料的一项重要声学参数，为了在水池中对材料的反射系数进行测量，提出了一种基于脉冲压缩技术的测量方法，对接收信号进行压缩来提取直达波和反射波。该方法不仅可以克服实验过程中经常遇到的多途干扰，而且测量过程简单，可以同时获得测量频带内所有频点的反射系数，即实现了对反射系数的宽带测量。通过仿真验证了该方法的可行性，并且给出了30~40 kHz频率范围内对铝板的水池实验结果。通过测量结果与理论值的比较可以发现，测量曲线存在一定的偏差和起伏，但可以通过增大发射信号带宽提高压缩效果或采用适当的窗函数压低旁瓣的方法来得到更为精确的测量结果。

关键词: 声学, 脉冲压缩技术, 反射系数, 宽带, 多途干扰

Abstract: The reflection coefficient is one of the most important acoustic parameters of materials. In order to measure it in water tank, a method based on pulse compression technique was proposed to extrct the directive and reflective waves from the received compressing signal. This method can overcome unavoidable multi-path disturbance in experiments and easily obtain the reflection coefficient at different frequencies in the measured frequency band. That is, the wide-band measurement for reflection coefficient was realized. The method was verified through simulation. Further more, the experiment results in water tank for an aluminum plate in the frequency range of 30-40 kHz were given also. Comparison of experimental results with theoretical value shows that, although the experiment curve exhibits some deviation and fluctuation, a more accurate result would be obtained by increasing the frequency band of transmitting signal to improve the compression effect or applying appropriate window functions to suppress the level of side lobes.

Key words: acoustics, pulse compression technique, reflection coefficient, wide-band, multi-path disturbance

中图分类号:

于盛齐，宋扬，黄益旺. 基于脉冲压缩技术的宽带反射系数测量方法[J]. 兵工学报, 2012, 33(8): 951-955.

YU Sheng-qi， SONG Yang， HUANG Yi-wang. A Wide-band Method for Measurement of Reflection Coefficient Based on Pulse Compression Technique[J]. Acta Armamentarii, 2012, 33(8): 951-955.

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基于脉冲压缩技术的宽带反射系数测量方法

A Wide-band Method for Measurement of Reflection Coefficient Based on Pulse Compression Technique

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