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Coherent-OTDR technology is one of acoustic distributed fiber-sensing systems. Because of the advantages of anti-electric magnetic field interference, anti-corrosion and flexibility, it has been attracting more and more interest. Because the sound pressure is weak, the strain generated on the fiber is tiny and the sensitivity of the sensing system is low. Although many research has been made on expanding measuring distance and improving response frequency, the acoustic signals in the experiments are always replaced by PZT's mechanical stretching. In this work, a device for increasing sensitivity for acoustic in the passive acoustic detection system based on coherent optical time domain reflection (C-OTDR) is promoted. A way of improving sensitivity partly based on a thin-walled corrugated tube was promoted. The thin-walled corrugated tube was used as the element to transmit the energy of acoustic into the vibration of fiber. In section 2, a mathematical model of sensing based on corrugated tube was established. Theoretical result shows that the vibration of fiber is mainly caused by the tube movement along the axis direction. And it also shows the linear relationship between the vibration and the sound pressure. The sensitivity of the improved sensing devices is calculated and a computational formula for sensitivity calculating are also given. In section 3, the C-OTDR acoustic distributed fiber-sensing systems are set up. Fiberring and three types of thin-walled corrugated tubes are used for acoustic sensing. The minimum detection sound pressure level reaches 60.1 dB and the phase sensitivity reaches 2.975 rad/Pa. The experimental phase sensitivity of different sensing devices with different parameters change similarly to the theory results. The experimental results show that the way of improving sensitivity and the mechanical model for calculating sensitivity are effective. This research provides theoretical and experimental basis for further development of distributed optical fiber sensing.
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Keywords:
- coherent detection /
- optical time domain reflection /
- acoustic sensing /
- sensitivity improving
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[18] Luo W 2006 M. S. Dissertation (Qinhuangdao:Yanshan University) (in Chinese)[骆伟2006硕士学位论文(秦皇岛:燕山大学)
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[1] Teixeira J G V, Leite I T, Silva S, Frazo O 2014 Photon. Sens. 4 198
[2] Wild G, Hinckley S 2008 IEEE Sens. J. 8 1184
[3] Takahashi N, Hirose A, Takahashi S 1997 Opt. Rev. 4 691
[4] Wang S, Lu P, Liao H, Zhang L, Liu D, Zhang J 2013 J. Mod. Opt. 60 1892
[5] Sakai T, Suzuki S, Wakayama S 2016 Exp. Mech. 56 1439
[6] Moccia M, Pisco M, Cutolo A, Galdi V, Bevilacqua P, Cusano A 2011 Opt. Express 19 18842
[7] Guo F, Fink T, Han M, Koester L, Turner J, Huang J 2012 Opt. Lett. 37 1505
[8] Wei P, Shan X, Sun X 2013 Opt. Fiber Technol. 19 47
[9] He H, Shao L, Li Z, Zhang Z, Zou X, Luo B, Pan W, Yan L 2016 Sensors-Basel 16 681
[10] Hussels M T, Chruscicki S, Habib A, Krebber K 2016 In Sixth European Workshop on Optical Fibre Sensors (EWOFS') Limerick, Ireland, May 30, 2016 p99162Y
[11] Palmieri L, Schenato L 2013 The Open Opt. J. 7 104
[12] Lu Y, Zhu T, Chen L, Bao X 2010 J. Lightwave Technol. 28 3243
[13] Wu Y, Gan J, Li Q, Zhang Z 2015 IEEE Photonics J. 7 1
[14] Shang Y, Yang Y, Wang C, Liu X, Wang C, Peng G 2016 Measurement 79 222
[15] Wang D H, Jia P G, Ma Z G, Xie L F, Liang Q B 2014 Electron. Lett. 50 649
[16] Wang C, Shang Y, Liu X, Wang C, Peng G D 2014 Asia Communications and Photonics Conference Shanghai, China, November 11-14, 2014 pATh3A-213
[17] Iida D, Toge K, Manabe T 2016 Optical Fiber Communications Conference and Exhibition Anaheim, California United States, March 20-22, 2016 pM2D-6
[18] Luo W 2006 M. S. Dissertation (Qinhuangdao:Yanshan University) (in Chinese)[骆伟2006硕士学位论文(秦皇岛:燕山大学)
[19] L D C, Zhang X P 2010 Acta Opt. Sin. 25 1025 (in Chinese)[吕丁成, 张晓萍2010光学学报25 1025]
[20] Zhao L J 2010 Acta Phys. Sin. 59 6219 (in Chinese)[赵丽娟2010 59 6219]
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