高精度准分布式光纤光栅地震检波解调系统的研究
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摘要
提出了一种利用光纤超荧光光源的线性边带做边缘滤波器进行多点多参量实时测量的地震波信号解调系统.由于光源波长检测灵敏度对解调系统的灵敏度起决定作用,故对光源进行了优化设计,使得光源所用的线性段斜率得到了大幅度提高.所设计的解调系统以光源在吸收峰1530nm处的两段斜边将系统分为两个部分,各部分对应4个通道.通过对其中两个通道进行地震检波模拟测量,传感解调系统的两部分静态波长灵敏度分别为887.5mV/nm和-971.7mV/nm,应变分辨力分别达到了0.95με和0.86με.解调系统采用全光结构,解调灵敏度高,稳定性好,性价比高且反应速度快,可实现对地震信号的多点多参量实时检测.
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.
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.
引文
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[2]Kersey A D,Davis M A,Patrick H J1997Lightwave Technology151442
[3]Sun J L2001Acta Phys.Sin.502382(in Chinese)[孙家林2001物理学报502382]
[4]Wang Y P,Rao Y J,Ran Z L,Zhu T2003Acta Phys.Sin.521432(in Chinese)[王义平、饶云江、冉曾令、朱涛2003物理学报521432]
[5]Qiao X G,Jia Z A,Fu H W,Li M,Zhou H2004Acta Phys.Sin.53494(in Chinese)[乔学光、贾振安、傅海威、李明、周红2004物理学报53494]
[6]Zhu T,Rao Y J,Mo Q J2006Acta Phys.Sin.55249(in Chinese)[朱涛、饶云江、莫秋菊2006物理学报55249]
[7]Xue L F,Zhao D Q,Liu J G,Guo T,Huang G L,Liu L H2006Acta Phys.Sin.552804(in Chinese)[薛力芳、赵启大、刘建国、郭团、黄桂岭、刘丽辉2006物理学报552804]
[8]Zhang J L,Yu C X,Wang K R,Zhao D X,Lin M M,Li C2009Acta Phys.Sin.583988(in Chinese)[张锦龙、余重秀、王葵如、赵德新、林妹妹、李成2009物理学报583988]
[9]Shu X W,Huang D X,Deng G H,Shi W,Jiang S2000Acta Phys.Sin.491731(in Chinese)[舒学文、黄德修、邓桂华、施伟、江山2000物理学报491731]
[10]Zhang C,rao Y J,Jia X H,Chang L,Ran Z L2010Acta Phys.Sin.595523(in Chinese)[张超、饶云江、贾新鸿、苌亮、冉曾令2010物理学报595523]
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