煤矿瓦斯光纤传感检测仪的研制

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1、武汉理工大学硕士学位论文煤矿瓦斯光纤传感检测仪的研制姓名：赵磊申请学位级别：硕士专业：测试计量技术与仪器指导教师：王洪海20090501武汉理工大学硕七学位论文AbstractThegasiSoneofthesourceswhicharethemajornaturaldisastermthecoalmine．Firedampexplosionnotonlyinfluencesthenormalproductionofthemineral，butalsothreatenstothesafetyofthecoalmineworkersseriously．Itisveryimpor

2、tanttomeasurethedistributionofmethaneconcentrationinreal·time．Thisarticleisbasedontheprincipleofgasspectralabsorption,developtheopticalfibergassensor,takesomeindustrializationexperiment，tomakesurethatthesystemCallbeappliedintheindustrialfield．Inthisarticlewefocusontheresearchofthedetectiono

3、fcn4，anddeveloptheopticalfibergassensorwhichhasrealizedthefunctionthatitcallcontinuouslydetectstheconcentrationofmethaneintheenvironmentofexcavatingworkingface，丽IldlanewayandSOon．Besides，itcandisplaytheinstantconcentration，outputthefrequencysignalwhichisproportionaltothemeasuredmethaneconce

4、ntration，alarmatthethresholdoflimitationandSOon．Ourcircuitdesignissafetyinessenceandwetakeverificationtoit，makesurethatitCanbeusedinmanydangerouscoalmines．Inthecoalminesafetymonitoringsystem，theopticalfibersensorCanbeusedwithothercoalminesafetymonitoringsystems，whichalecompatible．Themainwor

5、kinthisarticleincludetheaspectasfollows：1)Someresearchweredoneontheworkingprincipleoftunablediodelaserabsorptionspectroscopy(TDLAS)，usethewavelengthmodulationandharmonicdetectiontechnologytoimprovedetectionsensitivity，andbasedonthegasabsorptionpeal(thatisselected，theDFBLDwhichwavelengthis16

6、65nmisselectedasthelightSOurCe．2)Accordingtothetheoreticalanalysis，thelightpathandcircuitweredesigned．ThefeeblesignalisobtainedbyFour-Channel，Four-QuadrantAnalogMultiplierMLT04，andthephaselockedamplifycircuiteliminatetheeffectsofthephasedifferencebetweenthetestsignalandthereferencesignalwhi

7、chcausesbythedelayoftheopticalfibertransmissionandthecircuititself,andgetthesecondharmonicamplitudeinformationfromthehardwaredirectly．II武汉理工大学硕士学位论文Inviewofpoorworkingenvironmentforcoalmine．thestmcnIreofthesensor’Sshellandthegaschamberweredesignedspecial