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采用3×3耦合器的光纤光栅激光传感系统(FBGLS)的波长解调结果依赖于3×3耦合器的物理特性,解调结果会因3×3耦合器三路输出的直流项、干涉条纹可见度和相位差参数的不稳定而发生一定程度的失真。理论推导给出了标定参数的方法并实现了计算机编程,能够在较大信号时实时给出标定结果,同时给出了相应的解调方案。计算机模拟发现采用上述方法消除了由3×3耦合器三路输出的参数不稳定带来的谐波,实验中解调结果的对比表明该方法带来一定程度的改善,和标准参考传感器测量结果有很高的相关性,此外基于该解调方案的光纤光栅激光传感系统具有较高的分辨率、动态范围和线性度。
The wavelength demodulation result of FBGLS with 3 × 3 couplers depends on the physical characteristics of the 3 × 3 coupler. The demodulation result will be affected by the DC term of the 3 × 3 coupler output, interference Streak visibility and phase difference parameters are not stable and a certain degree of distortion occurs. The theoretical derivation gives the method of calibrating parameters and realizes the computer programming. It can give the calibration results in real time when there is a large signal. At the same time, the corresponding demodulation scheme is given. Computer simulation found that using the above method to eliminate the output of the 3 × 3 coupler three-way output parameters caused by the instability of the harmonic comparison of the experimental results show that the method to some extent improved, and the standard reference sensor measurements In addition, the fiber grating laser sensing system based on the demodulation scheme has high resolution, dynamic range and linearity.