现有变压器油中溶解气体监测存在需要载气及标气，色谱柱老化，检测精度低等缺点，本课题拟采用空心光子晶体光纤(HC-PCF)及光纤光栅腔体衰减振荡检测技术(FBG-FLCRD )进行油中气体检测，解决现有技术存在的问题。本课题将探索掌握HC-PCF 气室构型及飞秒激光表面纳米孔洞制备方法，调控HC-PCF 及纳米孔洞的形状、密度和直径，提升HC-PCF 气体传感单位等效气室长度；探索普通单模光纤与HC-PCF 的熔接工艺，降低熔接损耗；结合掺铒光纤放大器的增益钳制技术，提出并构建基于HC-PCF 和FBG-FLCRD 的油中溶解烃类气体检测光路拓扑；探寻并建立传感器灵敏度、精度、响应时间等动静态指标及老化性能与HC-PCF 孔密度和直径、运行温度、激光功率、背景气体等因素的量化关系。最终获得高精度、长期稳定的HC-PCF & FBG-FLCRD 油中溶解气体检测系统。

Conventional on-line Dissolved Gas Analysis (DGA) has several disadvantages: carrier gas requirement, regular calibration, low accuracy and poor reliability. In order to solve these problems, we propose a novel monitoring system based on Hollow Core-Photonic Crystal Fiber (HC-PCF) and Fiber Bragg Grating Fiber loop cavity ring-down detection (FBG-FLCRD). In the research, gas cell structure, hole density, and hole diameter of the HC-PCF will be investigated to enlarge the equivalent gas cell length, and the preparation processes of the HC-PCF and gas cell will be obtained. Then, the splicing method between single mode fiber and HC-PCF will be researched to reduce the splicing loss. After that, a new configuration of gain-clamped Erbium-Doped Fiber Amplifier will be proposed to form an optical topology which is suitable to DGA based on HC-PCF and FBG-FLCRD. Moreover, lots of experiments will be carried out, and the dynamic, static and reliable parameters of the detection system will be related with the HF-PCF hole density, HF-PCF hole diameter, temperature, laser power, and background gas. After the research, a highly accurate and reliable HC-PCF & FBG-FLCRD dissolved gas detection system will be obtained.