基于空心光子晶体光纤的变压器油中溶解气体光学腔衰减振荡检测方法研究

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.