可調(diào)諧激光瓦斯?jié)舛葯z測(cè)系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn).pdf

1、武漢理工大學(xué)碩士學(xué)位論文可調(diào)諧激光瓦斯?jié)舛葯z測(cè)系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)姓名：李勇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：周祖德20080401AbstractItisgascalamitythatimperilsthesafetyofminingindustryinourcountryInminingexploitation，hiddentroubleinsafetyhasincreasedgraduallyTheratioofgasa

2、ccidenttowholeminingaccidenthasincreasedgraduallySo，detectingtheorigin，leakanddensityofmethane(themaincomponentofgas)intimeiscrucialtothesafetyofminingindustryandpersonalsecurityandsafetyThisprojectistheexperimentfocusin

3、gonfiberopticsensorandthewholesystem，SOthatthesystemCanwidelybeappliedintoindustrialfield。Theinstrumentanddataanalysissystemaredeveloped，whichrealtimedetectstheconcentrationofmethaneintheenvironmentofexcavatingworkingfac

4、e，windlanewayandSOonBesides，thesystemCandisplaytheinstantconcentration，alarmatthethresholdoflimitation，andthefrequencysignalisoutputwhichislineartomethaneconcentrationdetectedThedesigninfactisthesafetyandexplosiveavoidon

5、eThatiswhyitCanbeusedinmanydangerouscoalminesIntheexplosiveavoidmonitoringsystem，thesystemCanbeusedwithothermonitoringsystems，whicharecompatibleHere，themainassignmentincludesseveralschemesasfollows：(1)Thespectrumabsorpti

6、ontheoryandthetechnologyofTDLASisdetailed(2)HITRUNisusedtochooseabsorptionapexThenthesourceandphotoelectricitydiodeareselected，basedonthewavelengthandmeasuringmethodthatisselected(3)Accordingtothetheoreticalanalysis，thel

7、ightpath，circuitandgaschannelaredesignedThefeeblesignalisobtainedbyphaselockedamplifierThenoisewillberestrainedinmaximumdegreeAlsothesignaltonoiseratiowillberaisedUsingwavelettransformtofilter、smoothanddenoisingthewaves(