差分光學吸收在線測量有害氣體研究.pdf

1、電子科技大學碩士學位論文差分光學吸收在線測量有害氣體研究姓名：徐理明申請學位級別：碩士專業(yè)：光學指導教師：楊小麗20100501ABSTRACTABSTRACTWiththeacceleratedprocessofindustrialization，environmentalissueshavebeenthefocusofthepeople’SattentionOneoftheenvironmentalissues，airpolluti

2、oncausesmoreandmoreimpactonthepeople’ShealthSOthedetectionofenvironmentalpollutiongasbecomesessentialThereareseveralmethodsofgasdetection，thetraditionalmethodshavethedrawbacks，suchascomplicatedoperation，heavyequipmentsom

3、ehazards，notreal—timemeasurementThisthesisusestheopticalabsorptionprincipletodothegasconcentrationmeasurementdesignforthreecommonharmfulgasescarbonmonoxide，methaneandformaldehyde，aimingtodesignasafe，convenient，real—timem

4、onitoringanddetectingsmallregionalatmosphericgasmeterThelawofopticalabsorptionprincipleCallbedescribedbyLambert—BeerlawInordertoapplythelawforthegasdetection，theanalysisofthegases’opticalabsorptionpropertiesisnecessaryTh

5、isthesisgiveswavebandanalysisforthethreegasescarbonmonoxide，methaneandformaldehydeinthebandofabsorptionspectraandthecomparativeanalysisforeachotherThreegasabsorptionpeaksforthegasesinthemidinfraredaretakenastheirmeasurem

6、entwavesDirectBseofLambertBeerlawingasconcentrationdetectionhasmanydifficultiesduetotheexistenceofsomekindsof組rorsInthisthesis，thedifferentialopticalabsorptionmeasurementmethodiSusedtodesignthestructureofgasconcentration

7、measurementDifferentialopticalabsorptionmeasurementmethodhasseveralspecificformsThisthesisanalyzesseveralimportantways，andadoptsaimproveddualwavelengthsinglebeammethodwhichisprovidedinthisthesisTheLEDtogetherwiththeuseof

8、opticalfilteriSselectedtoobtaindualwavelengthlightSOurCeSDual—wavelengthsinglebeammethodononehanddetectstheintensityofthelightabsorptionatoneofthegasabsorptionpeaks，whichCallbeusedtocalculategasconcentrationontheotherhan

9、dimplementsthesamemeasureatthereferencewavelengthneartheabsorptionpeakwavelengthintendingtousethequotientofthedetectedlightintensityatthegasabsorptionpeakwavelengthandthedetectedlightintensityatthegasreferencewavelengtht