量子电子学报2025，Vol.42Issue(5)：620-628,9.DOI:10.3969/j.issn.1007-5461.2025.05.004
基于光声光谱的变压器油中溶解气体高灵敏检测技术
High sensitivity detection technology for dissolved gases in transformer oil based on photoacoustic spectroscopy
摘要
Abstract
A detection technology for dissolved fault characteristic gases in insulating oil based on photoacoustic spectroscopy is proposed to meet the real-time monitoring requirement of transformer operation status.Considering the characteristics of low total amount and difficult separation of fault characteristic gases dissolved in transformer insulation oil,a high-performance miniaturized non-resonant photoacoustic cell is designed.By constructing a two-way excitation structure in the photoacoustic cell with a coaxial high-reflection mirror,the amplitude of the photoacoustic signal is effectively enhanced.By connecting a vacuum degassing device with the high-performance non-resonant photoacoustic cell through a gas circuit,an automated detachment and analysis system for dissolved fault characteristic gases in transformer oil is formed.By optimizing the selection of absorption spectral lines,the cross-interference of water vapour on the characteristic fault gas acetylene is suppressed and the detection accuracy is improved.In addition,by combining wavelength modulation technology with second harmonic detection technology,the background noise is reduced and the detection sensitivity of acetylene is further improved.The experimental results show that this proposed scheme can achieve a detection limit of 0.05 μL/L for acetylene in transformer insulation oil.关键词
光谱学/光声光谱/真空脱气/变压器/油中溶解乙炔Key words
spectroscopy/photoacoustic spectroscopy/vacuum degassing/transformer/dissolved acetylene in oil分类
数理科学引用本文复制引用
陈兴龙,陈可友,万国华,张春晓,陈珂..基于光声光谱的变压器油中溶解气体高灵敏检测技术[J].量子电子学报,2025,42(5):620-628,9.基金项目
国家自然科学基金(62275040) （62275040）
