Abstract：In order to solve the problem of low accuracy and mutual interference in multi-component gas detection, a kind of multi-component gas detection network with high accuracy was designed. A semiconductor laser with narrow bandwidth was utilized as light source and a novel long-path gas cell was also used in this system. By taking the single sine signal to modulate the spectrum of laser and using space division multiplexing (SDM) and time division multiplexing (TDM) technique, the detection of multi-component gas was achieved. The experiments indicate that the linearity relevance coefficient is 0.99 and the measurement relative error is less than 4%. The system dynamic response time is less than 15 s, by filling a volume of multi-component gas into the gas cell gradually. The system has advantages of high accuracy and quick response, which can be used in the fault gas on-line monitoring for power transformers in real time.
Key words：Multi-component gas detection for power transformers;Spectral modulation;Harmonic detection;Long-path cell
范 洁，陈 霄*，黄奇峰，周 玉，陈 刚 . 变压器油中多组分气体高精度在线检测研究 [J]. 光谱学与光谱分析, 2013, 33(12): 3326-3329.
FAN Jie, CHEN Xiao*, HUANG Qi-feng, ZHOU Yu, CHEN Gang . Study on High Accuracy Detection of Multi-Component Gas in Oil-Immerse Power Transformer. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(12): 3326-3329.
