用于油中溶解乙炔气体检测的微腔光热传感器OA
Microcavity photothermal sensor for detecting dissolved acetylene gas in oil
为实现变压器油中溶解气体的在线检测,提出一种基于微腔光热传感器的油中溶解乙炔(C2H2)气体检测方法.基于光热光谱气体检测技术,设计了集油气分离和气体检测功能于一体的微型光纤光热传感探头,且气室体积仅为1 μL.将光纤法布里-珀罗(F-P)微腔作为气体吸收池和光学干涉仪,近红外激发光和探测光通过波分复用器(Wavelength Di-vision Multiplexing,WDM)由单根光纤传输.其中,气体吸收产生的光热信号由光纤F-P干涉仪检测,并通过白光干涉相位解调方法读取信号.激发光经过掺铒光纤放大器(Erbium-Doped Fiber Amplifier,EDFA)后输出功率达到 410 mW,系统对C2H2气体体积分数的检测灵敏度为0.064 pm/(μL/L).实验结果表明,所设计的光纤光热气体传感系统对油中溶解C2H2气体体积分数检出限达到0.7 μL/L.该传感系统具有气室体积小、抗电磁干扰、无需抽油和现场便于安装的优势,为变压器油中溶解C2H2气体的检测提供了技术支持.
An in situ method for online detection of dissolved acetylene(C2H2)in transformer oil is pro-posed using a microcavity photothermal(PT)sensor.A fiber-optic PT sensing probe integrating oil-gas separation and gas detection was designed based on PT spectroscopy.The sensing chamber has a volume of only 1 μL.The fiber-optic Fabry-Perot(F-P)microcavity functions simultaneously as a gas absorption cell and an optical interferometer.Near-infrared excitation and probe beams are transmitted through a sin-gle fiber via a wavelength-division multiplexer.The PT signal induced by gas absorption is detected using the F-P interferometer and retrieved through white-light interferometric phase demodulation.After erbium-doped fiber amplification,the excitation power reached 410 mW,and the C2H2 sensitivity was 0.064 pm/(μL·L-1).Experiments yielded a detection limit of 0.7 μL/L for the volume fraction of dis-solved C2H2 in oil.The system offers a compact sensing chamber,immunity to electromagnetic interfer-ence,pump-free operation,and convenient field deployment,providing a practical approach to transform-er-oil dissolved-gas monitoring.
莫冰玉;王海亭;马国祥;李辰溪;李子彬;韩梦龙;陈珂
国网青海省电力公司 电力科学研究院,青海 西宁 810008国网青海省电力公司,青海 西宁 810008国网青海省电力公司,青海 西宁 810008江南大学 光电信息与物理科学学院,江苏 无锡 214122国网青海省电力公司 电力科学研究院,青海 西宁 810008国网青海省电力公司 电力科学研究院,青海 西宁 810008江南大学 光电信息与物理科学学院,江苏 无锡 214122
数理科学
光热光谱光纤光热传感溶解气体检测微量气体检测
photothermal spectroscopyfiber-optic photothermal sensingdissolved gas detectiontrace gas detection
《光学精密工程》 2026 (15)
2271-2279,9
国网青海省电力公司科技项目(No.52280725000W)
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