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报道了一种基于环形腔光纤激光器和1×4模拟电子开关的具备实时监测功能的光纤光栅传感网络查询技术,利用级联的波分复用光栅串充当环形腔光纤激光器端镜,借助可调法布里珀罗滤波器对反射的信号光进行扫描,调整光路结构并增加抽运光强度使信号光得到足够的增益,则可获得各传感元工作波长的激光脉冲,且依时序输出。又引入1×4模拟电子开关,将转换为电信号的激光输出按时序分配至4个输出信道。结合非平衡扫描干涉解调技术,实现了对4光栅传感阵列的查询解调。1555 nm波长时系统传感灵敏度的实验值为1.630°/με,与理论值1.674°/με基本吻合。
A fiber grating sensing network query technology with real-time monitoring based on ring cavity fiber laser and 1 × 4 analog electronic switch is reported. The cascaded wavelength division multiplexed grating string acts as ring cavity fiber laser end mirror, The Fabry-Perot filter scans the reflected signal light, adjusts the optical path structure and increases the pump light intensity so that the signal light has enough gain, then the laser pulses of the working wavelength of each sensing element can be obtained and output in time sequence . Also introduced 1 × 4 analog electronic switch, the laser output converted to electrical signals in time sequence assigned to the four output channels. Combined with unbalanced scanning interferometric demodulation technology, the demodulation of 4-grating sensing array is realized. The sensitivity of the system at 1555 nm wavelength is 1.630 ° / με, which is basically consistent with the theoretical value of 1.674 ° / με.