基于微型光声传感器的油中溶解气体检测技术  

Technique for Detection of Dissolved Gas in Oil Based on Miniature Photoacoustic Sensor

作　　者：马凤翔 田宇 陈珂 靳丰 张望[4] 祁炯 于清旭 Ma Fengxiang;Tian Yu;Chen Ke;Jin Feng;Zhang Wang;Qi Jiong;Yu Qingxu(Electric Porwer Resarch Institute,Anhui Electric Pouer Co.,Lud.,State Grid,Hefei,Anhui 230601,China;Anhui Electric Power Co..Ltd.,State Grid,Hefei,Anhui 230061,China;School of Optoeletronic Engineering and Instrumentation Science,Dalian University of Technology,Dalian,Liaoning 116024,China;School of Information Science and Technology,Dalian Maritime Unitversity,Dalian,Liaoning 116026,China)

机构地区：[1]国家电网安徽省电力有限公司电力科学研究院,安徽合肥230601 [2]国家电网安徽省电力有限公司,安徽合肥230061 [3]大连理工大学光电工程与仪器科学学院,辽宁大连116024 [4]大连海事大学信息科学技术学院,辽宁大连116026

出　　处：《光学学报》2020年第7期201-207,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61905034,51277021);国家电网有限公司科技项目(521205190014);辽宁省自然科学基金(2019-MS-054)。

摘　　要：为满足油浸式变压器在线监测的需求,根据非共振光声光谱和无孔膜油气分离理论,将直径为40 mm的聚全氟乙丙烯(FEP)高分子膜与体积仅为0.3 mL的光声气室结合,设计了集成光声气体传感器和油气分离膜的微型传感模块,该模块具有体积小、油气分离时间短及可实时在线检测的优点。油中溶解的故障特征气体扩散进入气室中,利用近红外激光光声光谱技术、波长调制和二次谐波检测技术对气室中的气体进行高灵敏度检测。对特征气体C2H2检测的实验结果表明,在油温为60℃时,油中溶解气体传感系统可在3 h内实现油气分离平衡,其中对于体积分数为10-6的油中溶解C2H2气体的体积分数测量误差在±30%之内。Based on the non-resonant photoacoustic spectroscopy and the non-porous membrane oil-gas separation theory, we design a miniature detection module by integrating a photoacoustic gas sensor with an oil-gas separation membrane to satisfy the demand for online monitoring of the oil-immersed power transformer. This design can be realized by combining a polytetrafluoroethylene propylene(FEP) polymer membrane with a diameter of 40 mm with a photoacoustic chamber with a volume of only 0.3 mL. The designed module exhibits a small size, short oil-gas separation time, and real-time online detection. When the fault characteristic gas dissolved in the oil diffuses into the gas chamber, the techniques such as near-infrared laser photoacoustic spectroscopy, wavelength modulation, and second-harmonic detection are used to achieve high-sensitivity gas detection. The experimental detection results of the characteristic C2H2 gas prove that an oil-gas separation balance in the oil sensing system with dissolved gas can be realized within 3 h at an oil temperature of 60 ℃. Furthermore, the measurement error is within ±30% for the C2H2 gas dissolved in oil with a volume fraction of 10-6.

关 键 词：光谱学 光声光谱 微量气体检测 波长调制 高电压与绝缘 油气分离 

分 类 号：O433.5[机械工程—光学工程]