基于PGC光纤传感器的全数字化解调设计与分析
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摘要
介绍了一种基于Mach-Zehnder和Sagnac混合干涉型分布式光纤传感器的相位产生载波(PGC)全数字化解调系统。针对GD32F103信号算法处理芯片,进行了PGC数字解调系统的设计,对系统性能进行了分析,最后与模拟解调效果进行了性能对比分析。实验待测信号为0~50 kHz,理想情况下管道泄漏点距离法拉第旋转镜距离为8 045 m,实际情况下距离为8 188.7 m,绝对误差为143.7 m,相对误差为1.75%。本数字系统具有良好的稳定性和较高的定位精度。
A kind of phase generated carrier( PGC) digital demodulation system of distributed optical fiber sensor based on hybrid interferometric configuration of Mach-Zehnder and Sagnac is introduced. For the GD32F103 chip of signal processing of algorithm,design PGC digital demodulation system,performance analysis of PGC digital demodulation system is carried out,and comparison with analog demodulation effect and analysis is carried out.The test signal is 0 ~ 50 kHz in the experiment,in an ideal condition,distance between leak point and Faraday rotation mirror is 8 045 m,actual distance is 8 188. 7 m,absolute error is 143. 7 m,the relative error is 1. 75 %. This digital system has good stability and high positioning precision.
A kind of phase generated carrier( PGC) digital demodulation system of distributed optical fiber sensor based on hybrid interferometric configuration of Mach-Zehnder and Sagnac is introduced. For the GD32F103 chip of signal processing of algorithm,design PGC digital demodulation system,performance analysis of PGC digital demodulation system is carried out,and comparison with analog demodulation effect and analysis is carried out.The test signal is 0 ~ 50 kHz in the experiment,in an ideal condition,distance between leak point and Faraday rotation mirror is 8 045 m,actual distance is 8 188. 7 m,absolute error is 143. 7 m,the relative error is 1. 75 %. This digital system has good stability and high positioning precision.
引文
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[12]黄悦,王强,杨其华,等.水下天然气管道分布式光纤泄漏检测系统实验分析[J].激光与光电子学进展,2014,51(11):106-111.
[13]李玉,黄俊斌,谢顺依,等.光纤激光水听器的PGC实时全数字解调系统[J].海军工程大学学报,2012,24(1):97-100.
[2]Huang Shihchu,Lin Wuuwen,Tsai Mengtsan.Fiber-optic in-line distributed sensor for detection and localization of the pipeline leaks[J].Sensors and Actuators A:Physical,2007,135(2):570-579.
[3]许海燕,吴红艳,肖倩.基于相位生成载波的全光纤传感器定位研究[J].传感器与微系统,2015,34(11):30-32.
[4]陈宇,林京,孟强.基于3×3耦合器光纤水听器的数字化解调方案[J].仪器仪表学报,2008,29(4):755-759.
[5]Xu Wei,Wang Jinhai,Chen Caihe,et al.Design of demodulation system of interferometric sensor based on Lab VIEW[J].Semiconductor Photonics and Technology,2008,14(2):115-120.
[6]朱俊,王强,谷小红,等.混合干涉型分布式光纤传感器PGC信号解调设计与实验分析[J].应用光学,2015,35(4):660-666.
[7]吴红艳,贾波,叶佳,等.基于光纤干涉定位系统的信号解调技术[J].传感器与微系统,2007,26(5):45-51.
[8]刘明,闫超.定点化PGC数字解调算法原理与应用[J].电声技术,2012,36(4):51-55.
[9]蓝天,张春熹,李立京,等.全数字PGC解调的载波相位超前技术[J].光电工程,2008,35(7):49-52.
[10]王利威,刘阳,张敏,等.干涉型光纤传感器相位生成载波技术研究与改进[J].光子学报,2009,38(4):766-769.
[11]张楠,孟洲,饶伟,等.干涉型光纤水听器数字化外差检测方法动态范围上限研究[J].光学学报,2011,31(8):92-98.
[12]黄悦,王强,杨其华,等.水下天然气管道分布式光纤泄漏检测系统实验分析[J].激光与光电子学进展,2014,51(11):106-111.
[13]李玉,黄俊斌,谢顺依,等.光纤激光水听器的PGC实时全数字解调系统[J].海军工程大学学报,2012,24(1):97-100.