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借助 1× 3光开关和可调F P滤波器对充当环形腔激光器端镜的 3× 10空、波分复用光纤光栅传感器阵列进行查询 ,用非平衡Michelson扫描干涉仪将来自传感光栅的波长漂移信息变为相移信息实现解调 ,实验证实系统的应变传感灵敏度为 1 6 817Deg με,与理论值 1 6 843Deg με非常吻合。锁定来自某一光栅的信号后 ,反馈装置保证系统具备自动追踪感测信号的能力。
A 1 × 3 optical switch and an adjustable FP filter were used to interrogate the 3 × 10 null and WDM FBG arrays which act as ring laser end mirrors. The unbalanced Michelson scanning interferometer was used to separate the wavelength from the sensing grating The drift information is transformed into phase shift information to realize demodulation. Experiments show that the sensitivity of strain sensing system is 1 6 817Deg με, which is in good agreement with the theoretical value of 1 6 843Deg με. After locking a signal from a grating, the feedback device ensures that the system has the ability to automatically track the sensed signal.