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《基于差分后谐波检测的瓦斯浓度传感器研究.pdf》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、第24卷第6期传感技术学报、_01.24No.6CHINESEJOURNALOFSENSORSAND4fFi'l7:'~TORSJune20112011年6月ResearchonMethaneConcentrationSensorBasedonDifferenceandHarmonicDetection4YANGWeihong,,Keming,XUGuangming,RENLanzhu,f1.,School{《MechanicalEngineering,LiaoningTechnicalUniversity,FuxinL
2、ioong123000,China、l2.SchoolofMechanicalEngineering,A~rtheasternUniversity,Shenyang110004,China;lI3.Sch00lofMechanica2Engineering.UniversityofScienceandTechno~ogyBeijing,Beijing100083,ChinoAbstract:Basicprincipleofmethaneconcentrationsensorsystemwasintroduced.Meth
3、aneconcentrationdetectionmodelbasedondifferenceandharmonicdetectionwaspresented.Mathlematicalmodelofmethaneconcentrationsen—sorwasestablished.Systemstructureofthesensorwasdesigned,andexperimentalresearchOilthesensorwascar—riedout.Usingthedifferencebetweenre~rence
4、dlightintensityandmetricallightintensity,differenceandharmonicdetectionmodelcancounteractthefirstharmoniccomponent.Throughdetectingthesecondharmonicoff{ifereneesignal,andthendetectingtheratioofthesecondharmonicandthefirstharmonic,gasconcentrationcanbeob—tained.In
5、gaschamber,linearlypolarizedlightwhichisusedasinputopticalsignalisproducedbypolarizerandde—tectedbyanalyzer.Theexperimentalresultsshowthatthesystemabilityofopticalpathanti—interfm’enceanddetec—tingthesecondharmonic,componentisimproved,andthesensitivityandresoluti
6、onofthesystemareincreasedtoobyusingthismethod.Thismethodhasgooddetectionefects.Keywords:sensortechnology;difference;harmonicdetection;polarizedlight;methaneEEACC:7230Edoi:10.3969/j.issn.1004-1699.2011.06.005基于差分后谐波检测的瓦斯浓度传感器研究木杨伟红,刘克铭,徐广明,任兰柱,,1.辽宁工程技术大学机械学院,辽宁阜新
7、123000;、l2.东北大学机械学院,沈阳110004;lI3.北京科技大学机械学院,北京100083/摘要:介绍了瓦斯浓度传感器系统的基本原理,提出了基于差分后偕波检测的瓦斯浓度检测模型,建立丁瓦斯浓度传感器数学模型,没计了传感器系统结构,对传感器进行r实验研究。差分后偕波检测模型利用参考光路与检测光路光强的差分消去一次谐波分量,对差分后的信号再进行二次谐波榆测,最后检测二次谐波与一次蜻波的比值得¨{气体浓度在气室中利用起偏器产生线偏振光作为光信号输人,利用榆偏器检测线偏振光实验结果表明使用该方法提高了系统光路的抗干
8、扰能力和检【斗l二次谐波分暴的能力,有效地提高了系统的灵敏度和分辨率,具有良好的捡测效果。关键词:传感器技术;差分;偕波榆测;偏振光;瓦斯中图分类号:TP212.14文献标识码:A文章编号:1004-1699(2011)06-0803-05瓦斯是易燃易爆气体,是煤矿生产中的主要有害时,吸收系数将发生变化,引起检测结果
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