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A new earthquake detection demodulation system for monitoring several points and several parameters at the same time is proposed by using the linear sideband of super-fluorescent fiber source as an edge filter. The sensitivity of whole demodulation system is determined by the detecting sensitivity of source light. Through the optimization of light, the slope of light linear part is improved greatly. According to the rising and the falling of light, the system is divided into two parts each with four channels. Through the stimulation experiments of all the channels, the static wavelength sensitivities of the two parts are 887.5 mV/nm and -971.7 mV/nm, and their stain resolutions reseach 0.95με and 0.86με respectively. This demodulation system has high sensitivity, good stability, quick demodulation speed, etc. It is the most important is that it can realize real-time detection for several points and several parameters at the same time.
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Keywords:
- fiber optics /
- seismic detection /
- edge filter /
- fiber light source
[1] Nellen P M, Mauron P, Frank A 2003 Sensors and Actuators 103 364
[2] Kersey A D, Davis M A, Patrick H J 1997 Lightwave Technology 15 1442
[3] Sun J L 2001 Acta Phys. Sin. 50 2382 (in Chinese) [孙家林 2001 物理学报 50 2382]
[4] Wang Y P, Rao Y J, Ran Z L, Zhu T 2003 Acta Phys. Sin. 52 1432 (in Chinese) [王义平、饶云江、冉曾令、朱 涛 2003 物理学报 52 1432]
[5] Qiao X G, Jia Z A, Fu H W, Li M, Zhou H 2004 Acta Phys. Sin. 53 494 (in Chinese) [乔学光、贾振安、傅海威、李 明、周 红 2004 物理学报 53 494]
[6] Zhu T, Rao Y J, Mo Q J 2006 Acta Phys. Sin. 55 249 (in Chinese) [朱 涛、饶云江、莫秋菊 2006 物理学报 55 249]
[7] Xue L F, Zhao D Q, Liu J G, Guo T, Huang G L, Liu L H 2006 Acta Phys. Sin. 55 2804 (in Chinese) [薛力芳、赵启大、刘建国、郭 团、黄桂岭、刘丽辉 2006 物理学报 55 2804]
[8] Zhang J L, Yu C X, Wang K R, Zhao D X, Lin M M, Li C 2009 Acta Phys. Sin. 58 3988 (in Chinese) [张锦龙、余重秀、王葵如、赵德新、林妹妹、李 成 2009 物理学报 58 3988]
[9] Shu X W, Huang D X, Deng G H, Shi W, Jiang S 2000 Acta Phys. Sin. 49 1731 (in Chinese) [舒学文、黄德修、邓桂华、施 伟、江 山 2000 物理学报 49 1731]
[10] Zhang C, rao Y J, Jia X H, Chang L, Ran Z L 2010 Acta Phys. Sin. 59 5523 (in Chinese) [张 超、饶云江、贾新鸿、苌 亮、冉曾令 2010 物理学报 59 5523]
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[1] Nellen P M, Mauron P, Frank A 2003 Sensors and Actuators 103 364
[2] Kersey A D, Davis M A, Patrick H J 1997 Lightwave Technology 15 1442
[3] Sun J L 2001 Acta Phys. Sin. 50 2382 (in Chinese) [孙家林 2001 物理学报 50 2382]
[4] Wang Y P, Rao Y J, Ran Z L, Zhu T 2003 Acta Phys. Sin. 52 1432 (in Chinese) [王义平、饶云江、冉曾令、朱 涛 2003 物理学报 52 1432]
[5] Qiao X G, Jia Z A, Fu H W, Li M, Zhou H 2004 Acta Phys. Sin. 53 494 (in Chinese) [乔学光、贾振安、傅海威、李 明、周 红 2004 物理学报 53 494]
[6] Zhu T, Rao Y J, Mo Q J 2006 Acta Phys. Sin. 55 249 (in Chinese) [朱 涛、饶云江、莫秋菊 2006 物理学报 55 249]
[7] Xue L F, Zhao D Q, Liu J G, Guo T, Huang G L, Liu L H 2006 Acta Phys. Sin. 55 2804 (in Chinese) [薛力芳、赵启大、刘建国、郭 团、黄桂岭、刘丽辉 2006 物理学报 55 2804]
[8] Zhang J L, Yu C X, Wang K R, Zhao D X, Lin M M, Li C 2009 Acta Phys. Sin. 58 3988 (in Chinese) [张锦龙、余重秀、王葵如、赵德新、林妹妹、李 成 2009 物理学报 58 3988]
[9] Shu X W, Huang D X, Deng G H, Shi W, Jiang S 2000 Acta Phys. Sin. 49 1731 (in Chinese) [舒学文、黄德修、邓桂华、施 伟、江 山 2000 物理学报 49 1731]
[10] Zhang C, rao Y J, Jia X H, Chang L, Ran Z L 2010 Acta Phys. Sin. 59 5523 (in Chinese) [张 超、饶云江、贾新鸿、苌 亮、冉曾令 2010 物理学报 59 5523]
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