提出了Sagnac光纤水听器锯齿波主动相位偏置方案,分析了锯齿波2π复位误差对系统性能的影响。采用频率为94.05kHz,复位电压为10.84V的锯齿波对信号进行调制,将系统偏置在π/2附近。为抑制2π复位误差的影响,采用与锯齿波同步的脉冲信号控制模/数(A/D)转换器定时采样,采样结果就是所需的声音信号。实验表明,该系统在10kHz频率响应处信号幅度平均值为0.067rad,方差为3.08×10-5rad,信号幅度相对变化仅为0.046%,系统相位偏置十分稳定。 Proposed Sagnac fiber hydrophone sawtooth active phase bias scheme, analysis of the sawtooth 2π reset error on the system performance. The signal is modulated with a sawtooth at a frequency of 94.05 kHz and a reset voltage of 10.84 V, biasing the system around π / 2. In order to restrain the influence of the 2π reset error, the pulse signal controlled by the sawtooth wave is used to control the A / D converter to sample regularly, and the sampling result is the required sound signal. Experiments show that the average amplitude of the system at 10kHz frequency response is 0.067rad, the variance is 3.08 × 10-5rad, the relative amplitude of signal amplitude is only 0.046%, and the system phase offset is very stable.