资源描述：
《石英增强光声光谱技术-研究与探索》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、重庆大学硕士学位论文II英文摘要ABSTRACTThedevelopmentoftracegasdetectionisveryimportantforambientairmonitoring,humanoranimalandplantphysiologicalstatediagnosis,andlong-rangedetectionofexplosives.Sincephotoacousticspectroscopywithhighsensitivity,dynamicrange,detectorresponsehasnothingto
2、dowiththeincidentwavelengthandothercharacteristics,haslongbeenoneofthemostimportantdevelopmentdirectionoftracegasdetectiontechnology.Overtheyears,inordertoimprovethesensitivityofphotoacousticspectroscopy,theimprovedphotoacousticcelldesignandmoresensitivemicrophoneshadbee
3、nused.Emergingquartzenhancedphotoacousticspectroscopy,representsanewdevelopmentdirectionofphotoacousticspectroscopy.Inthispaper,quartzenhancedphotoacousticspectroscopyprinciplewasstudied;asimplefiberopticalpathQEPASsystemwaspresented.Intheopenairenvironment,usingwatervap
4、orintheairasthetracegastobedetected,theQEPASexperimentwascompleted.Theperformanceofthetwotype’sopticalstructureQEPASsystemwasevaluated,usingtheobtainedexperimentaldata.TheprincipleofQEPASinvolvesinfraredgasabsorption,wavelengthmodulationanddemodulationprincipleandimpleme
5、ntationmethodandphotothermalsignalgenerationanddetectionofacoustic.Theinfraredgasabsorptionlineintensity,linearfunctionandlinewidthcalculationmethodwasgiven.OnthebasisofFourieranalysis,atheoreticalanalysisofthewavelengthmodulationanddemodulationprocesswasgiven.Abriefintr
6、oductionofthephotoacousticsignalgenerationisgivenstartingfromthecyclicalenergychange.ConnectionanddifferenceofQEPASandtraditionallaserpasweregiven.ThesignalcharacteristicsofQEPASwereanalyzed.InaQEPASsystem,quarttuningforkplaysadualeffectofphotoacousticenergyaccumulationa
7、ndphotoacousticsignaldetection.Startingfromthepiezoelectriceffectandinversepiezoelectricofquartzcrystal,themechanismofthequartztuningforkastheenergyaccumulatorandtheacousticsensorwasanalyzed.Thequartztuningforkfeaturetestcircuitwasbuilt.Usingthefeaturetestcircuit,thefeat
8、uretestexperimenthadbeendoneandtheresonantfrequencyf0,QValueandtheequivalentresistanceRhadbeenobtained.
