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.