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1.国网青海省电力公司 电力科学研究院,青海 西宁 810008
2.国网青海省电力公司,青海 西宁 810008
3.江南大学 光电信息与物理科学学院,江苏 无锡 214122
Received:03 April 2026,
Revised:2026-05-05,
Online First:14 August 2026,
Published:10 August 2026
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莫冰玉,王海亭,马国祥等.用于油中溶解乙炔气体检测的微腔光热传感器[J].光学精密工程,2026,34(15):2271-2279.
MO Bingyu,WANG Haiting,MA Guoxiang,et al.Microcavity photothermal sensor for detecting dissolved acetylene gas in oil[J].Optics and Precision Engineering,2026,34(15):2271-2279.
莫冰玉,王海亭,马国祥等.用于油中溶解乙炔气体检测的微腔光热传感器[J].光学精密工程,2026,34(15):2271-2279. DOI: 10.37188/OPE.20263415.2271. CSTR: 32169.14.OPE.20263415.2271.
MO Bingyu,WANG Haiting,MA Guoxiang,et al.Microcavity photothermal sensor for detecting dissolved acetylene gas in oil[J].Optics and Precision Engineering,2026,34(15):2271-2279. DOI: 10.37188/OPE.20263415.2271. CSTR: 32169.14.OPE.20263415.2271.
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(C
2
H
2
)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 Division 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C
2
H
2
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C
2
H
2
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C
2
H
2
气体的检测提供了技术支持。
An in situ method for online detection of dissolved acetylene (C
2
H
2
) in transformer oil is proposed 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 single 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 C
2
H
2
sensitivity was 0.064 pm/(μL·L
-
1
). Experiments yielded a detection limit of 0.7 μL/L for the volume fraction of dissolved C
2
H
2
in oil. The system offers a compact sensing chamber, immunity to electromagnetic interference, pump-free operation, and convenient field deployment, providing a practical approach to transformer-oil dissolved-gas monitoring.
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