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报道了一种新颖的具有抗混叠功能的无源零差迈克耳孙型光纤水听器。它由一个普通的芯轴型光纤水听器和一个圆柱型亥姆霍兹共振器构成。在驻波罐中对其声压相位灵敏度频响进行了测量,结果表明该光纤水听器具有较好的声低通滤波特性,能有效地抑制声信号中的高频成分,从而实现抗混叠滤波。该光纤水听器的低频声压相位灵敏度主要由传感光纤长度和弹性增敏层的物理特性决定,约为-159dB(0dB=1rad/μPa)。在1150Hz附近出现了一个共振峰,这主要由圆柱型亥姆霍兹共振器的声学特性决定。1150~2280Hz频段内的灵敏度衰减率约为50dB/倍频程,1500Hz以后的灵敏度衰减量大于10dB。这对于提高我国未来声纳系统的抗干扰能力具有十分重要的意义。
A novel passive zero-difference Michelson optical fiber hydrophone with anti-aliasing function is reported. It consists of a common core-type fiber optic hydrophone and a cylindrical Helmholtz resonator. The frequency response of the sound pressure phase sensitivity was measured in the standing wave tank. The results show that the optical hydrophone has better sound low-pass filter characteristics, which can effectively suppress the high frequency components in the acoustic signal, so as to achieve anti-mixing Stack filter. The low-frequency sound pressure phase sensitivity of the fiber hydrophone is mainly determined by the sensing fiber length and the physical characteristics of the elastic sensitization layer, which is about -159dB (0dB = 1rad / μPa). A formant appears near 1150 Hz, which is mainly determined by the acoustic properties of the cylindrical Helmholtz resonator. Sensitivity decay rate in the frequency band of 1150 ~ 2280Hz is about 50dB / octave, sensitivity attenuation after 1500Hz is greater than 10dB. This is of great significance for improving anti-interference capability of China’s future sonar system.