光纤光栅传感技术及在油气井中的应用研究

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1、中国科学院西安光学精密机械研究所博士学位论文光纤光栅传感技术及在油气井中的应用研究姓名：张向东申请学位级别：博士专业：光学指导教师：李育林;彭文达20040801捅要的解调技术，提出了采用德报分离的曝德FFP滤波懿调和偏振分离静CCD平行攘测解调薪方法。最后对油气井下光纤Bragg光栅温度、压力测爨技术及其试验问题进行了系统研究。以有限元理论为糖导对双侧孔赢双扳射光纤的结构参数避行了理论模揪分析；以浮壁圆筒为弹性元件设计出了高可靠性并下压力增敏、瀛度去敏的FBG双参数同时测量系统，利用合作研制的信号解调和专用压力温度标定设备，对传感系统进彳{j=≯标定并在模拟并中

2、进行了初步试验。关键词：光纤光栅温度测量压力测量油气井雎AbstractFiber-opticgratingsensingtechnologyanditsapplicationOilthemeasurementofoil／gasdown—hole出ZhangXiangdongDirectedbyProf．LiYulinProf．PengWenda111ispaperfocusedintothefiber-opticgratingsensingtechnologyanditsapplicationsonthepressureandtemperaturemeasure

3、mentfortheoil／gasdown-hole，includingthebasictheoryandcharactersoffiber-opticgratings；thesensingmechanismoffiber-opticgratings；thefabricationtechnologiesofsensingfiber—opticgratings；thedemodulatingandmultiplexingtechnologiesofthesensingfiber—opticBragggratings；thetheoreticalandexperime

4、ntalresearchesonthepressureandtemperaturesensingsystems，Firstly，therecentdevelopmentsinthetechnologiesofsensingfiber—opticgratingsarereviewed．Then，severaldifferentfiber-opticsensingtechnologies，particularlyfortheoil／gasdown—holeareanaly麓dinacomparmgway,anditindicatesthatthefiber—optic

5、gratingsensingmethodisthebestoneinallOurdiscussionandhasabrilliantapplicationforeground．Afteranalyzingthephotosensitivitiesoftheopticalfibersandtheirmechanismsofformingfiber—opticgratings，themechanicalandthermalpropertiesofthefiber—opticgratingsarestudiedinatheoreticalway，severalinstr

6、uctiveconclusionsforenhancingthereliabilityofthefiber-opticgratingsensingsystemarededuced．Thepolarizedcoupledmodetheoryforthefiber-opticgratingsisbuilt．Thebirefringentpropertiesofthefibergratingisalsostudied．Then，thesensingmechanismsofthefiber-opticBragggratingsandthelong—periodfiberg

7、ratingsareanalyzedinasystemicway．羽隧spaperfocusesonthesensing+SuoportedbyChineseNationalScienceFoundation(No60177028)．(No。60337030)H1Abstractbirefringentcharactersofthetwokingsofgratings，andtheirapplicationsonthedualandmulti-parametersmeasurementssimultaneouslyThefabricationtechnologie

8、spart