基于旋光色散效应的波长检测技术在光纤光栅传感解中的应用.pdf

《基于旋光色散效应的波长检测技术在光纤光栅传感解中的应用.pdf》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、中文摘要光纤光栅传感网络可以实现准分布式多点测量，在国防、工业、大型建筑物的结构健康监测等领域己获得广泛应用。光纤光栅传感解调技术是把敏感光纤光栅中心波长的移位准确检测出来，是光纤光栅传感网络的的关键技术环节。目前已报道的波长标定方法有气体吸收法、光栅阵列法、F．P标准具法、F．P激光器法等。本论文中提出了基于旋光色散效应的波长检测方法，该方法可实现对扫描波长的实时标定，这是一项有很好应用前景的研究。其原理是利用旋光色散介质的旋光率与入射波长问有着一一对应关系，通过拟合的旋光色散曲线和测得的旋光角来确定入射光的波长。实验上搭建了相应的检测装置，利用石英晶体作为旋光

2、色散介质对129511111。1356nlll、1525nm-1640lllTI波段进行了实验研究，并对测量结果进行了MATLAB六阶拟合分析。该方法的主要优点是可标定范围大、精度高，实验上实现了对1525nm-1640111／1波段的115llnl波长范围内的全程标定，标定后的波长准确度可达到士10pm，与目前已报道的最好结果相当。关键词：旋光色散：波长解调；旋光率：光纤布喇格光栅黑龙江大学硕士学位论文AbstractFiberBragggratingsensingnetworkcanrealizequasi-distributedmultipointmeasu

3、rement，andhasbeenwidelyappliedintheaspectofstructuralhealthdetectioninthefieldsofnationaldefense，industryandlargebuildings．ThetechniqueoffiberBragggratingsensingdemodulationcalldetectthecenterwavelengthshiftofsensitivefibergratingexactly,whichisthekeytechniqueinthefibergratingsensingn

4、etwork．Nowadays，thereportedmethodsforwavelengthcalibrationcontaingasabsorptionmethod，gratingarraymethod，F-Petalonmethod，F—PlaserandSOon．Inthispaper,weproposedwavelengthdetectionbasedonopticalrotatorydispersioneffect，whichcanrealizethereal—timecalibrationforthescanningwavelength,thisis

5、averygoodapplicationprospectsofresearch．Thepincipleofthismethodisapplyingthecorrespondingrelationshipsbetweentherotatoryratioofopticalrotatorydispersionmaterialsandwavelengths．WeCangivethewavelengthofincidentlightbyfittingtheopticalrotatorydispersioncurveandmeasuredopticalrotatoryangl

6、es．inOUrexperiment,weconstructedthecorrespondingdetectionsetup，usingquartzcrystalasopticalrotatorydispersionmediumtocarryouttheexperimentsforthewavelengthrangeof1295nm一1356nmand1525nm-1640珈咀，andhascarriedontheMATLABsixorderfittinganalysistothemeasurementresults．Theadvantagesofthismeth

7、odincludethewiderangeofcalibrationandhighprecision,therealizationoffullscalecalibrationfor15rⅡnfrom1525lllnto1640nlTlinexperimentwiththewavelengthresolutionof士lOpm，whichisconsistentwiththebestresultsreported．Keywords：opticalrotatorydispersion；wavelengthinterrogation；rotatorypower；fibe

8、rBrag