光纤法布里-珀罗(F-P)传感器反射光谱的对比度直接影响解调精度, 利用模式耦合理论分析了端面倾斜角度对F-P传感器的反射光谱对比度以及信号强度的影响。通过理论和试验证明:随着光纤端面倾斜角度的增大, 反射光谱对比度迅速下降, 当角度达到5°以上时, 反射光谱无法解调。

Reflectance spectrum of optical fiber Fabry Perot (F-P) sensor contrast directly affects the demodulation precision. The end face of the tilt angle of the F-P sensor reflectance spectra contrast and signal intensity of influence from the mode coupling theory are analyzed. It is proved by theory and experiment that when the angle of inclination of the fiber end is increased, the contrast of the reflection spectrum decreases rapidly, and the reflection spectrum can not be demodulated when the angle reaches 5 degree.