光学学报, 2020, 40 (7): 0730003, 网络出版: 2020-04-15
基于微型光声传感器的油中溶解气体检测技术 下载: 1511次
Technique for Detection of Dissolved Gas in Oil Based on Miniature Photoacoustic Sensor
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 spectroscopy photoacoustic spectroscopy trace gas detection wavelength modulation high voltage and insulation oil-gas separation
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。
Abstract
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.
马凤翔, 田宇, 陈珂, 靳丰, 张望, 祁炯, 于清旭. 基于微型光声传感器的油中溶解气体检测技术[J]. 光学学报, 2020, 40(7): 0730003. Fengxiang Ma, Yu Tian, Ke Chen, Feng Jin, Wang Zhang, Jiong Qi, Qingxu Yu. Technique for Detection of Dissolved Gas in Oil Based on Miniature Photoacoustic Sensor[J]. Acta Optica Sinica, 2020, 40(7): 0730003.