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报道了基于激光吸收光谱学原理的天然气管道泄漏移动遥测技术,通过模拟天然气泄漏实验, 分析了移动遥测的关键技术问题.为了定量遥测天然气管道微量泄漏,引入一个和剩余幅度调制(RAM) 等值反相的信号对偏差进行补偿,降低RAM对谐波信号的影响,提高系统检测灵敏度. 针对遥测回波吸收光谱特征,提出了改进软阈值小波去噪法,就提高系统信噪比而言, 比传统软阈值去噪法高2倍多,同时对二次谐波(2f)信号形状也有很好的保留,通过探测限计算, 系统移动遥测灵敏度达到80 ppm/m.
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关键词:
- 激光吸收光谱技术 /
- 天然气管道泄漏 /
- 剩余幅度调制 /
- 改进软阈值小波去噪法
Quantitative remote sensing of natural gas pipeline leakage based on laser absorption spectroscopy is reported. Key technical issues of mobile laser remote sensing are discussed through simulating leak detection. For quantitative remote sensing of trace leakage, the signals with counter-phase and isovalue of residual amplitude modulation are introduced. Then the offset is compensated, the influence of harmonic signal is reduced and sensitivity is improved. The improved soft-threshold denoising method is proposed by analyzing the characteristics of echo absorption spectrum. The results show that the signal-to-noise ratio is improved two times as great as that by the traditional soft-threshold denoising method and the shape of second harmonic (2f) signal is well preserved. The minimum remote sensitivity will be 80 ppm/m under the mobile remote sensing.-
Keywords:
- laser absorption spectroscopy /
- natural gas pipeline leakage /
- residual amplitude modulation /
- improved soft-threshold denoising method
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[5] Werle P, Mücke R, Amato F D 1998 Appl. Phys. B 67 307
[6] Amato F D, Mazzing H P, Castagnoli F 2002 Appl. Phys. B 75195
[7] Qi F, LiuWQ, Zhou B 2003 Acta Phys. Sin. 52 2197 (in Chinese)[齐锋, 刘文清, 周斌 2003 物理学报 52 2197]
[8] Normand E, McCulloch M, Duxbury G, Langford N 2003 Opt.Lett. 28 16
[9] Kan R F, Liu W Q, Zhang Y J 2005 Acta Phys. Sin. 54 1927 (inChinese) [阚瑞峰, 刘文清, 张玉钧 2005 物理学报 54 1927]
[10] Roths J, Zenker T, Parchatka U 1996 Appl. Opt. 35 7075
[11] Zhu X, Cassidy D T 1995 Appl. Opt. 34 8303
[12] Duan Y G, Ma L Y, Li Y J, Wang T H 2010 Sci. Tech. Eng. 235755 (in Chinese) [段永刚, 马立元, 李永军, 王天辉 2010 科学技术与工程 23 5755]
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[1] Wang D Q, Gao H L 2006 Nat. Gas Ind. 26 120 (in Chinese) [王大庆, 高惠临2006 天然气工业 26 120]
[2] Fan H, Gao X M, Bao J, Wang X, Hang T 2006 Spectrosc. Spect.Anal. 26 1423 (in Chinese) [樊宏, 高晓明, 鲍健, 王霞, 黄腾 2006 光谱学与光谱分析 26 1423]
[3] Zhang S, Liu W Q, Zhang Y J 2010 Chin. Opt. Lett. 8 443
[4] Jason J N, Joanna M D I, Murray J T 2002 Appl. Opt. 41 446
[5] Werle P, Mücke R, Amato F D 1998 Appl. Phys. B 67 307
[6] Amato F D, Mazzing H P, Castagnoli F 2002 Appl. Phys. B 75195
[7] Qi F, LiuWQ, Zhou B 2003 Acta Phys. Sin. 52 2197 (in Chinese)[齐锋, 刘文清, 周斌 2003 物理学报 52 2197]
[8] Normand E, McCulloch M, Duxbury G, Langford N 2003 Opt.Lett. 28 16
[9] Kan R F, Liu W Q, Zhang Y J 2005 Acta Phys. Sin. 54 1927 (inChinese) [阚瑞峰, 刘文清, 张玉钧 2005 物理学报 54 1927]
[10] Roths J, Zenker T, Parchatka U 1996 Appl. Opt. 35 7075
[11] Zhu X, Cassidy D T 1995 Appl. Opt. 34 8303
[12] Duan Y G, Ma L Y, Li Y J, Wang T H 2010 Sci. Tech. Eng. 235755 (in Chinese) [段永刚, 马立元, 李永军, 王天辉 2010 科学技术与工程 23 5755]
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