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简介:ThereflectivecharacteristicsofSAWbyslantingmetalstripsonthesurfaceofYZ-LiNbO3havebeenstudied.ByusingbothSimpleModelandMulti-ReflectionModel,thereflectivecharacteristicsofSAWbyaperiodicmetalstriparrayandtheSAWdistributioninthearrayhavebeencalculated.Furthermore,Byusinganimprovedlaserprobe,thereflectiveSAWfieldbythearrayhasalsobeenmeasured.Bycomparingthetheoreticalresultswiththeexperiments,itisshownthattheresultsofMul-ti-ReflectionModel,beingmoreexactthantheSimpleone,areinbetteragreementwiththeexperiment
简介:Inthispaper,theangularspreadoftheSAWbeamdiffractedbyBragggrating,denotedbyδθ1,isana-lysedbasedontheequationsofthedeflectionangleandthedeflectioneffciency.AparameterδθBisde-finedtoreferto"Braggangularspectrumwidth"ofthegrating.Theimportanceofthisparameterindis-tinguishingtheangularspreadrangeofthedeflectedbeamfordifferentregimesisdiscussedaswell.Itisshowfromtheanalysisthatifthespreadangleoftheincidentbeamlabelledwithδθincislargethanthe"Braggwitdthoftheangularspectrum"ofthegrating,thespreadangleδθ1ofthedeflectedbeamwillequaltoδθB;butiftheangulardivergenceoftheincidentbeamislessthanδθB,thenδθ1=δθincExperimentally,fourkindsofsampleswithdifferentconfigurationsareinvestigatedbyopticalmethod,twoofwhichoperateintheregimeofδθinc<<δθBandtheotherscorrespondtothecaseintheregimeofδθinc>>δθB.Thewidthsoftheangularspreadoftheinciden
简介:Uniformdiamondfilmsarehighlydesirableforcuttingindustries,duetotheirhighperformanceandlonglifetimeusedoncuttingtools.Nevertheless,theyaredifficulttoobtainoncuttingtoolswithcomplicatedshapes,greatlylimitingtheapplicationsofdiamondfilms.Inthisstudy,anovelapproachofdepositionforuniformdiamondfilmsisproposed,oncircularsawbladesmadeofcementedcarbideusingreflectorsofbrasssheets.Diamondfilmsaredepositedusinghotfilamentchemicalvapordeposition(HFCVD).Anovelconcavestructureofbrasssheetsisdesignedandfabricated,improvingthedistributionoftemperaturefield,andovercomingthedisadvantagesoftheconventionalHFCVDsystems.ThisincreasestheenergyefficiencyofusewithoutchangingthestructureandincreasingthecostofHFCVD.Thegrainsarerefinedandtheintensitiesofdiamondpeaksarestrengthenedobviously,whichisconfirmedbyscanningelectronmicroscopyandRamanspectrarespectively.
简介:在里面常规多乐队直角的频率部门multiplexing极端宽带(MB-OFDMUWB)接收装置,快Fourier变换(快速傅里叶变换)算法被昂贵、消费力量的数字信号处理器(DSP)认识到芯片。在这篇文章,更低的力量,更低的费用,和更低的复杂性即时模拟表面声学的波浪(锯)啁啾Fouriertransform设备被用来代替DSP部分。MB-OFDMUWB接收装置基于M-C-MSAWchirpFourier变换被介绍,并且从输入信号的信号转变的步也被描绘。当在环境由IEEE802.15SG3a建议了的隧道使用了时,模拟结果证明建议接收装置与充分数字的接收装置相比提供类似的位错误性能。
简介:选择了六氟-2-羟基异丙基聚硅氧烷(SXFA)作为声表面波(SAW)化学传感器的敏感膜材料,采用Langmuir—Blodgett膜技术进行镀膜,得到超薄且厚度均匀的多层膜,并且研究了不同膜厚的传感器对甲基膦酸二甲酯(DMMP)的响应情况。
简介:设计制作了11-巯基-1,1-二(三氟甲基)十一醇(MTFUOL)自组装膜声表面波化学传感器(SAW-MTFUOL—P),利用该传感器对有机膦毒剂模拟剂甲基膦酸二甲酯(DMMP)进行了检测研究。研究结果证实,SAW-MTFUOL—P自组装镀膜传感器对DMMP具有较高的响应灵敏度,且响应时间短、恢复快。
简介:以β-环糊精衍生物(β-CDs)为膜材料,结合自组装成膜(SAM)和分子印迹技禾(MIP),在声表面波(SAW)金延迟线上镀上了对O-乙基-S-(β-二异丙氨基乙基)审基硫赶膦酸酯敏感的化学敏感膜。结果表明镀了膜的传感器对目标化合物检测取得了较好的效果,并以有机磷杀虫剂等为罩扰气体,检验了敏感膜对目标分子的特异选择性,探讨了O-乙基-S-(β-二异丙氨基乙基)甲基硫赶膦酸酯在敏感膜上的吸附情况。