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With the increase in the number of oil and gas pipelines laid in China, more attention needs to be paid to pipeline maintenance work. At present, the main methods of detecting natural gas leaks in oil and gas transmission stations include manual inspections, opposing natural gas detection equipment, and cloud desktop natural gas detection equipment. Hand held natural gas detection equipment is used for manual inspection, which requires regular manual inspection. However, the response speed is poor and gas leaks cannot be detected in a timely manner. The opposed laser gas detection method can only detect the presence of gas on the beam path. If a larger area of leakage detection is desired, more equipment needs to be installed, resulting in a greatly increase in hardware costs. The existing cloud desktop laser gas detection method controls the deflection of the laser beam through the cloud platform to achieve leak detection at various points in the area to be tested. However, the rotation speed of the cloud platform is slow, and a complete detection cycle takes dozens of minutes, and only the presence of gas can be detected. For accurate leak location, manual on-site survey is also required to further determine the leak location. In order to meet the needs of the real-time monitoring and rapid positioning of oil and gas pipeline leaks, in this work, a fast and accurately controlled dual wedge scanning mirror system is designed, which combines tunable semiconductor laser absorption spectroscopy technology to convert the gas measurement laser beam from point measurement to surface measurement, thereby obtaining the two-dimensional distribution of gas, which is conducive to subsequent analysis and positioning of gas leakage sources. By using the inverse solution iterative optimization algorithm, the angle of the wedge mirror is controlled to obtain an efficient and uniform beam scanning trajectory. The deflection direction and detection position of the laser beam are fused with the corresponding methane concentration information, and a methane concentration data containing position information is constructed. In order to quantitatively verify the measurement accuracy and spatial resolution in the experiment, a standard air bag is used to simulate the methane leakage distribution. The results show that the minimum detection limit of the system can be lower than 5×10–4 m, and the spatial resolution can be less than 6 cm. At the same time, this method can adjust the scanning step node based on the measurement distance of the oil from gas station, thereby achieving adjustable imaging resolution. This imaging method provides a new idea for accurately positioning and detecting the methane leakage location and amount.
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Keywords:
- tunable diode laser absorption spectroscopy /
- methane gas detection /
- double wedge scanning mirror /
- gas imaging
[1] 王小强, 王保群, 王博, 林燕红, 郭彩霞 2018 石油规划设计 29 1
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Wang X Q, Wang B Q, Wang B, Lin Y H, Guo C X 2018 Petroleum Planning Eng. 29 1
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Qi L R, Xing L L, Liu Y, Wang Y J 2022 Urban Gas 4 9
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[5] 朱云伟 2023 管道技术与设备 2 19
Google Scholar
Zhu Y W 2023 Pipeline Technique and Equipment 2 19
Google Scholar
[6] 庞涛, 王煜, 夏滑, 张志荣, 汤玉泉, 董凤忠 2016 光子学报 9 104
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Pang T, Wang L, Xia H, Zhang Z R, Tang Y Q, Dong F Z 2016 Acta Photon. Sin. 9 104
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[7] 徐俊, 李云飞, 程跃, 檀剑飞, 刘东, 周振 2023 激光与光电子学进展 6 376
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Google Scholar
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Google Scholar
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Fan D P, Zhou Y, Lu Y F, Hei M, Xiong F C, Li K 2013 Chin. Opt. 2 136
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Sun L Y 2016 M. S. Thesis (Chengdu: University of Electronic Science and Technology of China
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[21] 秦聪明 2021 硕士学位论文 (成都: 中国科学院大学, 中国科学院光电技术研究所)
Qin C M 2021 M. S. Thesis (Chengdu: University of Chinese Academy of Sciences, Institute of Optics and Electronics, Chinese Academy of Sciences
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Google Scholar
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Zeng H W, Li S, Zhang Z Y, Wu Y 2019 Opt. Precis. Eng. 27 1444
[25] Sandoval J D, Delgado K, Fariña D, de la Puente F, Esper-Chaín R, Martín M 2022 Appl. Sci. Basel 12 21
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Google Scholar
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Google Scholar
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图 1 双楔形扫描镜光束传输原理图
Figure 1. Schematic diagram of dual wedge scanning mirror.
图 2 双楔形扫描镜扫描轨迹 (a) 优化前光斑轨迹扫描图; (b) 轨迹半径与角度差$ {{\Delta }}\theta $的关系
Figure 2. Scanning trajectory of dual wedge scanning mirror: (a) Scanning image of spot trajectory before optimization; (b) relationship between trajectory radius and angle difference $ {{\Delta }}\theta $.
图 3 双楔形扫描镜不同角速度差值对应的扫描轨迹 (a) 0.25 (°)/s; (b) 0.2 (°)/s; (c) 0.15 (°)/s; (d) 0.1 (°)/s
Figure 3. Scanning trajectories corresponding to different angular velocity differences of dual wedge scanning mirrors: (a) 0.25 (°)/s; (b) 0.2 (°)/s; (c) 0.15 (°)/s; (d) 0.1 (°)/s.
图 4 光斑轨迹优化流程图
Figure 4. Flow chart of spot trajectory optimization
图 5 不同角速度差值优化后的光斑扫描轨迹 (a) 0.5 (°)/s; (b) 0.25 (°)/s
Figure 5. Optimized spot scanning trajectory with different angular velocity: (a) 0.5 (°)/s; (b) 0.25 (°)/s.
图 6 基于双楔形扫描镜的甲烷气体成像系统原理图
Figure 6. Schematic diagram of methane gas imaging system based on dual wedge scanning mirrors.
图 7 甲烷气体成像过程 (a) 实际扫描区域; (b) 散点图成像; (c) 二维邻域插值算法成像; (d) 滤波处理成像
Figure 7. Methane gas imaging process: (a) Actual scanning area; (b) scatter plot imaging; (c) 2D neighborhood interpolation algorithm for imaging; (d) filter processing imaging.
图 8 实际光束穿过气袋边缘位置的图解
Figure 8. Diagram of actual beam passing through the edge of the airbag.
图 9 甲烷气袋的成像对比实验 (a) 相同气袋充不同浓度的甲烷气体; (b) 相同气袋充不同浓度的甲烷气体成像图; (c) 不同气袋充相同浓度的甲烷气体; (d) 不同气袋充相同浓度的甲烷气体成像图
Figure 9. Imaging comparative experiment of methane gas bags: (a) Filling the same gas bag with different concentrations of methane gas; (b) imaging images of methane gas with the same gas bag filled with different concentrations; (c) filling different gas bags with methane gas of the same concentration; (d) imaging images of methane gas with different gas bags filled with the same concentration.
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[1] 王小强, 王保群, 王博, 林燕红, 郭彩霞 2018 石油规划设计 29 1
Google Scholar
Wang X Q, Wang B Q, Wang B, Lin Y H, Guo C X 2018 Petroleum Planning Eng. 29 1
Google Scholar
[2] 张志荣, 孙鹏帅, 庞涛, 李哲, 夏滑, 崔小娟, 吴边, 徐启铭, 董凤忠 2018 光学精密工程 26 1925
Google Scholar
Zhang Z R, Sun P S, Pang T, Li Z, Xia H, Cui X J, Wu B, Xu Q M, Dong F Z 2018 Opt. Precis. Eng. 26 1925
Google Scholar
[3] 董高华, 赵廉斌, 曹永乐, 梁怿, 葛淩志, 马铁量, 孟书进 2023 化工自动化仪表 3 283
Google Scholar
Dong G H, Zhao L B, Cao Y L, Liang Y, Ge L Z, Ma T L, Meng S J 2023 Contr. Instrum. Chem. Indust. 3 283
Google Scholar
[4] 祁丽荣, 邢琳琳, 刘瑶, 王一君 2022 城市燃气 4 9
Google Scholar
Qi L R, Xing L L, Liu Y, Wang Y J 2022 Urban Gas 4 9
Google Scholar
[5] 朱云伟 2023 管道技术与设备 2 19
Google Scholar
Zhu Y W 2023 Pipeline Technique and Equipment 2 19
Google Scholar
[6] 庞涛, 王煜, 夏滑, 张志荣, 汤玉泉, 董凤忠 2016 光子学报 9 104
Google Scholar
Pang T, Wang L, Xia H, Zhang Z R, Tang Y Q, Dong F Z 2016 Acta Photon. Sin. 9 104
Google Scholar
[7] 徐俊, 李云飞, 程跃, 檀剑飞, 刘东, 周振 2023 激光与光电子学进展 6 376
Google Scholar
Xu J, Li J, Li Y F, Cheng Y, Tan J F, Liu D, Zhou Z 2023 Laser Optoelectron. Prog. 6 376
Google Scholar
[8] 孙鹏帅, 张志荣, 李俊, 夏滑, 韩荦, 李哲, 谭东杰, 马云宾, 董凤忠 2016 光学与光电技术 5 62
Sun P S, Zhang Z R, Li J, Xia H, Han H, Li Z, Tan D J, Ma Y B, Dong F Z 2016 Opt. Optoelectron. Tech. 5 62
[9] Fox T A , Barchyn T E, Risk D, Ravikumar A P, Hugenholtz C H 2019 Environ. Res. Lett. 14 053002
Google Scholar
[10] van Well B, Murray S, Hodgkinson J, Pride R, Strzoda R, Gibson G, Padgett M 2005 J. Opt. 7 s420
Google Scholar
[11] Wainner R T, Green B D, Allen M G, White M A, Stafford-Evans J, Naper R 2002 Appl. Phys. B-Lasers O 75 249
Google Scholar
[12] Lagueux P, Tremblay P, Morton V, Chamberland M, Farley V, Kastek M, Firmanty K 2017 Meas. Autom. Monit. 63 65
[13] Hu Y Y, Xu L, Shen X C, Jin L, Xu H Y, Deng Y S, Liu J G, Liu W Q 2021 Appl. Opt. 60 9396
Google Scholar
[14] Zhao Q, Nie X, Luo D, Wang J, Li Q, Chen W 2022 Photonics 9 992
Google Scholar
[15] Gibson G M, Sun B Q, Edgar M P, Phillips D B, Hempler N, Maker G T, Malcolm G P A, Padgett M J 2017 Opt. Express 25 2998
Google Scholar
[16] McRae T G, Kulp T J 1993 Appl. Opt. 32 4037
Google Scholar
[17] 范大鹏, 周远, 鲁亚飞, 黑墨, 熊飞湍, 李凯 2013 中国光学 2 136
Google Scholar
Fan D P, Zhou Y, Lu Y F, Hei M, Xiong F C, Li K 2013 Chin. Opt. 2 136
Google Scholar
[18] 孙琳洋 2016 硕士学位论文 (成都: 电子科技大学)
Sun L Y 2016 M. S. Thesis (Chengdu: University of Electronic Science and Technology of China
[19] Marshall G F 1999 Conference on Optical Scanning - Design and Application Denver, Colorado JUL 21–22, 1999 p74
[20] Garcia-Torales G 2022 Conference on Advances in 3OM - Opto-Mechatronics, Opto-Mechanics, and Optical Metrology Opto-Mechanics, and Optical Metrology Timisoara, ROMANIA Timisoara, December 13–14, 2021 p121700H
[21] 秦聪明 2021 硕士学位论文 (成都: 中国科学院大学, 中国科学院光电技术研究所)
Qin C M 2021 M. S. Thesis (Chengdu: University of Chinese Academy of Sciences, Institute of Optics and Electronics, Chinese Academy of Sciences
[22] Sun J F, Liu L R, Yun M J, Wan L Y, Zhang M L 2006 Opt. Eng. 45 043004
Google Scholar
[23] Roy G, Cao X Y, Bernier R, Roy S 2015 Appl. Opt. 54 10213
Google Scholar
[24] 曾昊旻, 李松, 张智宇, 伍煜 2019 光学精密工程 27 1444
Zeng H W, Li S, Zhang Z Y, Wu Y 2019 Opt. Precis. Eng. 27 1444
[25] Sandoval J D, Delgado K, Fariña D, de la Puente F, Esper-Chaín R, Martín M 2022 Appl. Sci. Basel 12 21
[26] Titchener J, Millington-Smith D, Goldsack C, Harrison G, Dunning A, Ai X, Reed M 2022 Appl. Energy 306 118086
Google Scholar
[27] Gibson G, van Well B, Hodgkinson J, Pride R, Strzoda R, Murray S, Bishton S, Padgett M 2006 New J. Phys. 8 26
Google Scholar
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