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介绍了闭环反馈控制法稳定法布里-珀罗型光纤水听器相位工作点的基本原理,给出了法布里-珀罗型光纤水听器的声压相移灵敏度的表达式,推导了法布里-珀罗干涉透射光强替代函数的傅里叶变换解析式,用MathCAD软件绘制了该式对应的傅里叶变换谱线,通过谱线可以直观地了解系统输出信号的组成和特点。在实验中用频谱分析仪器记录了法布里-珀罗型光纤水听器透射光强的傅里叶变换谱,与软件仿真的理论谱线较好地吻合。通过实验进一步指出反馈临界点频率的选择方法,检验了反馈控制法在法布里-珀罗型光纤水听器相位工作点稳定过程中的实际效果,证明了该方法的可行性。
The basic principle of the closed-loop feedback control method to stabilize the phase operating point of the Fabry-Perot fiber optic hydrophone is introduced, and the expression of the phase-to-phase sensitivity of the Fabry-Perot fiber hydrophone is given. Fourier transform analysis of the Fabry-Perot interference substitution intensity function is carried out, and the corresponding Fourier transform spectrum of the equation is drawn by using MathCAD software. The composition of the output signal of the system can be intuitively understood through the spectral line Features. In the experiment, the Fourier transform spectra of the Fabry-Perot fiber optic hydrophone transmitted light intensity were recorded by spectrum analyzer, which is in good agreement with the theoretical spectrum of the software simulation. The experiment further points out the choice of the critical frequency of feedback and verifies the practical effect of the feedback control method in the steady state of Fabry-Perot fiber hydrophone operating point, and proves the feasibility of this method.