基于相位载波解调的声低通滤波光纤水听器抗混叠性能实验研究  

Experimental Investigations on Anti-Aliasing Properties of Acoustic Low-Pass Filtering Fiber-Optic Hydrophones Based on Phase Generate Carrier Demodulation

作　　者：王泽锋[1] 胡永明[1] 孟洲[1] 罗洪[1] 倪明[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2009年第8期2064-2069,共6页Chinese Journal of Lasers

基　　金：国家863计划(2006AA09Z121);国防科技大学优秀研究生创新目录(0623)资助课题

摘　　要：报道了声低通滤波光纤水听器的抗混叠实验结果。声低通滤波光纤水听器是为解决高频混叠问题而提出的一种新型光纤水听器。理论分析和实验研究已经表明,该类光纤水听器的声压灵敏度频响具有较好的低通滤波特性,对高频声信号有很强的抑制作用。通过设计对比实验.研究了高频干扰对普通光纤水听器系统信号解调的影响,以及声低通滤波光纤水听器的抗混叠性能。结果表明,当强高频干扰使得普通光纤水听器系统无法进行正确的信号解调时,声低通滤波光纤水听器的信号解调系统仍然能够正常工作,解调得到的声信号与没有干扰时的结果一致性非常好,相关系数在0.99以上。Experimental investigations on anti-aliasing properties of acoustic low-pass filtering fiber-optic hydrophones are reported. Acoustic low-pass filtering fiber-optic hydrophones is a novel kind of fiber-optic sensors, which is proposed to eliminate the aliasing in fiber-optic hydrophone arrays. Theoretical and experimental results show that it has good acoustic low-pass filtering properties, and can restrain the high frequency interference strongly. Effects of high freqeuncy interference on demodulation results of fiber-optic hydrophones without acoustic filter and anti-aliasing properties of fiber-optic hydrophones with acoustic filter are studied experimentally. Results show that fiber-optic hydrophones without filter cannot work normally when the high frequency interference is strong, while the acoustic low-pass filtering fiber-optic hydrophones still work well. The demodulation results of acoustic low-pass filtering fiber-optic hydrophone are in good agreement with the results without interference, and the correlation coefficient of the demodulation acoustic signals is higher than 0.99. Acoustic low-pass filtering fiber- optic hydrophones provide an effective solution to the aliasing existing in modern photoelectric sonar systems.

关 键 词：光纤光学 光纤传感器 光纤水听器 声压相位灵敏度 声滤波器 

分 类 号：TB133[机械工程—光学工程] TB565.1[理学—光学]