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基于熔融拉锥技术研制的3 dB宽带耦合器的光纤环形镜的工作原理,提出了一种新型的具有有源闭合腔装置的光纤光栅传感系统。在用作闭合共振腔端镜的环形镜中写入十个波分复用光纤光栅传感元,利用共振腔中接入的法布里-珀罗滤波器,通过控制电压对传感光栅的波长扫描,实现对传感地址的查询。用非平衡的迈克耳孙扫描干涉仪将传感光栅的波长漂移信息变为相移信息,实现传感信号的解调。系统传感灵敏度的实验值为1.5835°/10-6ε,与理论值(1.6662°/10-6ε)基本吻合。
Based on the working principle of fiber loop mirror with 3 dB broadband coupler developed by fused taper technology, a new type of fiber grating sensing system with active closed cavity is proposed. In the ring mirror which is used as a closed cavity endoscope, ten wavelength division multiplexed fiber grating sensing elements are written, and by using the Fabry-Perot filter inserted in the resonant cavity, Wavelength scanning, to achieve the sensor address query. An unbalanced Michelson scanning interferometer changes the wavelength shift information of the sensing grating into phase shift information to demodulate the sensing signal. The experimental sensitivity of the system is 1.5835 ° / 10-6ε, which is basically consistent with the theoretical value (1.6662 ° / 10-6ε).