光学精密工程2026，Vol.34Issue(15)：2271-2279,9.DOI:10.37188/OPE.20263415.2271
用于油中溶解乙炔气体检测的微腔光热传感器
Microcavity photothermal sensor for detecting dissolved acetylene gas in oil
摘要
Abstract
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.关键词
光热光谱/光纤光热传感/溶解气体检测/微量气体检测Key words
photothermal spectroscopy/fiber-optic photothermal sensing/dissolved gas detection/trace gas detection分类
数理科学引用本文复制引用
莫冰玉,王海亭,马国祥,李辰溪,李子彬,韩梦龙,陈珂..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):2271-2279,9.基金项目
国网青海省电力公司科技项目(No.52280725000W) （No.52280725000W）
