Combined Detection Technology of Trace Acetylene Gas Photothermal Interference and Multi-harmonic Signal

PAN Xingya; WANG Chao; SHAO Jianwei; ZHOU Yang; QIAO Ruixun

doi:10.13296/j.1001-1609.hva.2025.01.013

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Combined Detection Technology of Trace Acetylene Gas Photothermal Interference and Multi-harmonic Signal

Research & Analysis | 更新时间：2025-04-26

- Combined Detection Technology of Trace Acetylene Gas Photothermal Interference and Multi-harmonic Signal
- High Voltage Apparatus Vol. 61, Issue 1, Pages: 112-120(2025)
- 作者机构：
  
  武汉大学电气与自动化学院，武汉　 430072
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(61827820;62075170)
- DOI：10.13296/j.1001-1609.hva.2025.01.013
  CLC：
- Received：20 September 2024，
  
  Revised：25 November 2024，
  
  Published：16 January 2025
- 稿件说明：
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PAN Xingya, WANG Chao, SHAO Jianwei, et al. Combined Detection Technology of Trace Acetylene Gas Photothermal Interference and Multi-harmonic Signal[J]. High voltage apparatus, 2025, 61(1): 112-120.
DOI：

PAN Xingya, WANG Chao, SHAO Jianwei, et al. Combined Detection Technology of Trace Acetylene Gas Photothermal Interference and Multi-harmonic Signal[J]. High voltage apparatus, 2025, 61(1): 112-120. DOI： 10.13296/j.1001-1609.hva.2025.01.013.

摘要

乙炔作为油浸式变压器故障诊断的主要特征气体，其在变压器油中的溶解浓度能够反映变压器的绝缘状态，光热光谱气体检测技术是可用于电气设备在线监测的新方法。文中在光热干涉原理的基础上，提出了基于2+4次谐波联合分析、2+4+6次谐波联合分析的多谐波痕量乙炔气体检测方法，对不同谐波检测方法的调制深度进行了优化，并基于空芯光纤构建的法布里—珀罗干涉仪进行实验验证。相比于单2次谐波分析法，多谐波在0.5 h内的联合信号波动幅度低于1%，线性拟合优度

均高于0.999，且2+4次谐波联合分析法与单2次谐波分析法的检测极限均约为125 ppb（1 ppb=1×10

-9

）。结果表明多谐波信号联合分析用于痕量乙炔气体检测有助于提高检测稳定性和线性度。

Abstract

Acetylene is the main characteristic gas for fault diagnosis of oil-immersed transformers. Its dissolved concentration in transformer oil can reflect the insulation status of the transformer. Photothermal spectroscopy gas detection technology is a new method for online monitoring of electrical equipment. Based on the principle of photothermal interference

a multi-harmonic trace acetylene gas detection method based on the 2+4th harmonic joint analysis and the 2+4+6th harmonic joint analysis is proposed in this paper. The modulation depth of different harmonic detection methods is optimized and is experimentally verified by the Fabry-Perot interferometer based on hollow-core fiber. Compared with the single 2nd harmonic analysis method

the combined signal fluctuation amplitude of multiple harmonics within 0.5 h is less than 1%

the linear goodness of fit

is higher than 0.999

and the detection limit of the 2+4th harmonic combined analysis method and the single 2nd harmonic analysis method are both about 125 ppb (1 ppb=1×10

-9

). The results show that the combined analysis of multi-harmonic signals for the detection of trace acetylene gas would be helpful to improve the stability and linearity of detection.

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