Abstract：SF6 gas has been widely used in the power equipments as an excellent electric insulating and arc-quenching medium. In the present paper, a baseline correction method based on the optimum wavelet basis for spectrum detection is proposed to measure the composition content of the SF6 insulating gas to secure the power safety. In this method, the optimum wavelet basis is selected in the wavelet packet according to constructor function on the energy concentration criterion to express the spectrum signal in the time-frequency domain. Then the strong spectrum composition is removed from the spectrum signal with the threshold method to eliminate the interference with the continuous spectrum fitting. Finally we remove the continuous spectrum which is fitting result from the origin spectrum and obtain the useful signal of line spectrum. The intensities of spectral line processed with the proposed algorithm could reflect the concentration of the conponents to be measured in SF6 gas. Experiments to analyze the absorption spectrum of the SF6 insulating gas mixture show that the proposed algorithm can estimate and correct the drifting baseline accurately, and its performance is better than the algorithm based on iterative wavelet.
刘 艳1, 2，刘 凯1，陶维亮2，王先培2 . SF6绝缘气体光谱信号的最佳小波基基线校正算法 [J]. 光谱学与光谱分析, 2010, 30(06): 1688-1691.
LIU Yan1, 2, LIU Kai1, TAO Wei-liang2, WANG Xian-pei2 . Baseline Correction Method for Spectrum Signal of SF6 Insulating Air with Optimum Wavelet Basis . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(06): 1688-1691.
[1] LIU You-wei, WU Li-yuan, GONG Yan-peng(刘有为，吴立远，弓艳朋). Power System Technology(电网技术), 2009, 33(05): 58. [2] ZHANG Xiao-xing, YAO Yao, TANG Ju, et al(张晓星，姚 尧，唐 炬, 等). High Voltage Engineering(高电压技术), 2008, 34(04): 664. [3] XU Yuan-zhe, LIU Xian, HU Zhi-hui, et al(徐元哲，刘 县，胡智慧, 等). High Voltage Engineering(高电压技术), 2009, 35(02): 250. [4] Tai H, Yamamoto K, Uchida M, et al. Photonics Technology Letters, IEEE. 1992, 4(7): 804. [5] Weldon V, O’Gorman J, Phelan P, et al. Sensors and Actuators B: Chemical Proceedings of the 2nd European Conference on Optical Chemical Sensors and Biosensors. 1995, 29: 101. [6] YE Xian-feng, TANG Wei-zhong(叶险峰，汤伟中). Semiconductor Optoelectronics(半导体光电), 2000, 21(03): 218. [7] WANG Yi-ding, ZHONG Hong-jie, JIN Qin-han, et al(王一丁，钟宏杰，金钦汉, 等). Acta Scientiarum Naturalium Universitatis Jilinensis(吉林大学自然科学学报), 2001, (4): 69. [8] TAO Wei-liang, WANG Xian-pei, LIU Yan, et al(陶维亮，王先培，刘 艳, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2009, 29(05): 1241. [9] Hussam A, Alauddin M, Khan A H, et al. Journal of Environmental Science and Health, Part A, 2002, 37(7): 1223. [10] Maleki M R, Mouazen A M, Ramon H, et al. Biosystems Engineering, 2007, 96(3): 427. [11] Acharya T, Chakrabarti C. The Journal of VLSI Signal Processing, 2006, 42(3): 321. [12] LUO A-li, ZHAO Yong-heng(罗阿理，赵永恒). Acta Astrophysica Sinica(天体物理学报), 2000, 20(04): 427. [13] Starck J L, Siebenmorgen R, Gredel R. The Astrophysical Journal, 1997, 482(2): 1011. [14] PENG Yu-hua(彭玉华). Wavelet Transform and Application in Engineering(小波变换及其在工程中的应用). Beijing: Science Press(北京: 科学出版社), 2002. 137. [15] ZHAO Xue-zhi, CHEN Tong-jian, PENG Yong-hong, et al(赵学智, 陈统坚, 彭永红, 等). Signal Processing(信号处理), 2002, 18(06): 543.
