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  • 简介:Laser-inducedbreakdownspectroscopy(LIBS)isananalyticaldetectiontechniquebasedonatomicemissionspectroscopytomeasuretheelementalcomposition.LIBShasbeenextensivelystudiedanddevelopedduetothenon-contact,fastresponse,highsensitivity,real-timeandmulti-elementalde-tectionfeatures.ThedevelopmentandapplicationsofLIBStechniqueinAsiaaresummarizedanddiscussedinthisreviewpaper.TheresearchersinAsiaworkondifferentaspectsoftheLIBSstudyinfundamentals,dataprocessingandmodeling,applicationsandinstrumentations.Accordingtothecurrentresearchstatus,thechallenges,opportunitiesandfurtherdevelopmentofLIBStechniqueinAsiaarealsoevaluatedtopromoteLIBSresearchanditsapplications.

  • 标签: LASER-INDUCED BREAKDOWN SPECTROSCOPY (LIBS) QUANTITATIVE analysis
  • 简介:我们由导致激光的故障光谱学(解放)的炸药的察觉上的最近的工作在这份报纸被考察。我们学习了器官的炸药的导致激光的血浆的物理机制,TNT。在单个光子的刺激下面的TNT的解放系列用MATLAB被模仿。碳,氢,氧,和氮对血浆温度的原子排放线紧张的变化也被模仿。我们也调查普通无机的爆炸、黑粉末的解决时间的解放系列,在二种包围气氛,表情和氩,并且发现黑色的O原子排放线SBR的最大的价值搽粉发生在596ns的门延期。我们的工作的另一个焦点在使用象原则部件分析(PCA)和部分最少的广场判别式分析(PLS-DA)那样的chemometic方法把器官的炸药与象塑料那样的器官的材料区分开来上。为分类的一个PLS-DA模型被造。TNT和塑料的七种类型被选择为样品测试模型。试验性的结果证明解放结合了chemometric技术有能力从塑料区别器官的炸药。

  • 标签: 激光诱导等离子体 无机炸药 光谱探测 击穿 MATLAB仿真 等离子体温度
  • 简介:Ultrashortlaserpulsesareusedtocreatesurfacestructuresonthin(25μm)silicon(Si)wafers.Scanningthewaferwithagalvanometricmirrorsystemcreateslargehomogeneouslystructuredareas.Thevarietyofstructureshapesthatcanbegeneratedwiththismethodisexemplifiedbytheanalysisofshape,heightanddistanceofstructurescreatedintheambientmediaairandisopropanol.Astudyofthecorrelationbetweenstructureheightandremainingwaferthicknessispresented.Thecomparativelyeasymanufacturingtechniqueandthestructurevarietythatallowsforcustom-tailoredtargetsshowgreatpotentialforhighrepetitionrateionaccelerationexperiments.

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  • 简介:Wereportsingle-shotdamagethresholdasafunctionofpulseduration(50-900fs)forMgF2/ZnS800-nmomnidirectional-reflectionfilm,interferencefilter,andgoldfilm.Theresultsindicatethatthedamagewithultrashortpulseisnonthermal,whichisdifferentfromthatwithlongpulse.Additionally,theablationcraterdepthsof45°high-reflectionfilmandinterferencefilterarepresented.Alogarithmicrelationbetweentheablationdepthandpulsefluence,whichissimilartothatoftransparentmaterials,isfound.

  • 标签: 毫秒激光器 多层断裂诱导 金薄膜 超短脉冲
  • 简介:Thelaser-inducedrelativisticshockwavesaredescribed.Theshockwavescanbecreateddirectlybyahighirradiancelaserorindirectlybyalaseraccelerationofafoilthatcollideswithasecondstaticfoil.Aspecialcaseofinterestisthecreationoflaser-inducedfusionwherethecreatedalphaparticlescreateadetonationwave.Anovelapplicationissuggestedwiththeshockwaveorthedetonationwavetoigniteapre-compressedtarget.Inparticular,thedeuterium–tritiumfusionisconsidered.Itissuggestedthatthecollisionoftwolaseracceleratedfoilsmightserveasanovelrelativisticacceleratorforbulkmaterialcollisions.

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  • 简介:Thedetailsofthespecialthree-dimensionalmicro-nanoscalerippleswithaperiodofhundredsofmicronsonthesurfacesofaZr-basedandaLa-basedmetallicglassirradiatedseparatelybysinglelaserpulseareinvestigated.Weusethesmall-amplitudecapillarywavetheorytounveiltherippleformationmechanismthroughconsideringeachofthemoltenmetallicglassesasanincompressibleviscousfluid.Ageneralizedmodelispresentedtodescribethespecialmorphology,whichfitstheexperimentalresultwell.Itisalsorevealedthattheviscositybringsaboutthebiggesteffectonthemonotonedecreasingnatureoftheamplitudeandthewavelengthofthesurfaceripples.Thegreatertheviscosityis,theshortertheamplitudeandthewavelengthare.

  • 标签: 金属玻璃 广义模型 表面结构 激光诱导 表面波纹 激光脉冲
  • 简介:Atheoreticalmodelisproposedtodescribethemechanismoflaser-inducedplasmashockwaveevolutioninair.Toverifythevalidityofthetheoreticalmodel,anopticalbeamdeflectiontechniqueisemployedtotracktheplasmashockwaveevolutionprocess.Thetheoreticalmodelandtheexperimentalsignalsarefoundtobeingoodagreementwitheachother.Itisshownthatthelaser-inducedplasmashockwaveundergoesformation,increaseanddecayprocesses;theincreaseandthedecayprocessesofthelaser-inducedplasmashockwaveresultfromtheoverlappingofthecompressionwaveandtherarefactionwave,respectively.Inaddition,thelaser-inducedplasmashockwavespeedandpressuredistributions,bothafunctionofdistance,arepresented.

  • 标签: 激光诱导等离子体 等离子体冲击波 演变 空气 机制 衰变过程
  • 简介:导致激光的血浆今天代表普遍分光镜的排放来源。它能容易用紧缩、可靠的毫微秒被产生材料的一个大变化上的搏动的激光。它为例如有导致激光的故障光谱学(解放)的spectrochemical分析的申请变得那么流行一个人趋于忘记导致它的产生并且管理它的进化的复杂物理、化学的过程。这篇评论文章的目的是总结必要的背景从它的产生理解并且描述导致激光的血浆到它的扩大进周围的气体。目的是不详细说明每个过程的细节;在文学为那有众多的专业化论文和书。这里的目标是在必要理解元素需要从一个复杂过程把导致激光的血浆描述为结果的一份一样的报纸聚在一起。这些元素能在背景气体在象激光事相互作用,材料的激光脱离,热、电离的气体的光、热力学的性质,或血浆繁殖那样的几块相关却独立的地里被驱散。我们相信那介绍以一条全面的路并且在这份报纸的有限的页理解导致激光的血浆的元素的整体将对进一步的开发有用并且优化LIBS技术的使用。每次如此的说明变得可能、有用,在我们的实验室获得的试验性的结果被用来说明学习物理过程。

  • 标签: 激光诱导等离子体 等离子体光谱 发射源 纳秒脉冲激光 光谱化学分析 物理过程
  • 简介:我们开发一个系统在我们的实验室用导致激光的故障光谱学(解放)测量无准备的样品的元素的作文,它能在固体,液体和喷雾器被用于元素的决心。包括激光,样品房间和察觉,对乐器学的描述被简短讨论跟随。在气压的铝的解决时间的解放被介绍。在结束,可能性和这种技术的以后的使用简短被讨论。

  • 标签: 光谱学 LIBS 烟雾剂 测试技术
  • 简介:Objective:Laser-inducedCoulombexplosionofgoldnanoparticlesforbreastcancerhasbeenstudiedbynanophotolysistechnique.Thisstudyaimedtoinvestigatewhetherlaser-inducedbubbleformationduetoCoulombexplosioncanprovideaneffectiveapproachforselectivedamageofbreastcancerwithgoldnanoparticles.Method:Numericalmethodinvolveslaser-inducedCoulombexplosionofgoldnanoparticles.Differentparametersrelatedtonanophotolysissuchaslaserfluence,tumordepth,clusterradius,laserpulseduration,andbubbleformationisstudiednumerically.NumericalsimulationwasperformedusingMatlab.Results:Thegoldnanoparticlesof10,20,30,40,and50nminradiuscouldpenetrateintotumor1.14,1.155,1.189,1.20and1.22cmindepthrespectively.Themaximumpenetrationdepthintumorcouldbeobtainedwithnanoparticlesof50nmradius.Shortlaserpulseof40nswithnanoparticlesof10nmradiuscouldpenetrateintotumor1.14cmindepth.Bubbleswitharadiusof9μmcouldeffectivelykillbreastcancercellswithoutdamaginghealthyones.Thebubbleradiusincreasedfrom4to9μmwithanincreaseinpulsedurationintherangeof10to30ns.Conclusions:Goldnanoparticleswithincreasingradiusandbubbleformationforselectivedamageofbreastcancercellsaresuccessfullyprobed.Thepresentcalculatedresultsarecomparedwithotherexperimentalfindings,andgoodcorrelationisfoundbetweenthepresentworkandpreviousexperimentalvalues.Itwasdemonstratedthatbubbleformationintumormayfurtherincreasetheefficacyofbreastcancertreatment.

  • 标签: 金纳米粒子 乳腺癌细胞 库仑爆炸 激光诱导 治疗 脉冲持续时间
  • 简介:Lens-to-sample距离,延期时间,大气的状况,激光脉搏精力,等等在导致激光的故障光谱学的分析表演上有明显的效果。在这份报纸,这些参数详细地被调查,我们将解释他们怎么在分析表演上有影响。结果证明在样品表面下面的焦点的飞机能改进精确和察觉限制,并且延期时间应该根据敏感和精确性被决定。光谱线紧张比氦,氮和空气在氩是更强壮的气体环境。脉搏精力应该超过能产生血浆的精力阀值(大约50mJ),并且精力不应该超过大约300mJ避免血浆防护。分别地在最佳参数,C的集中亲戚标准差,Si,Mn,P,S,Ni,和为被测量11次的低合金的钢(第11278期样品)的Cr下面是2.37%,2.18%,2.23%,7.8%,9.34%,1.92%,和2.13%并且为纯钢的C,Si,Mn,P,S,Ni,和Cr的察觉限制分别地是0.0045%,0.0072%,0.0069%,0.0027%,0.0024%,0.0047%,和0.0024%。

  • 标签: 激光诱导 参数影响 性能 光谱 击穿 等离子体屏蔽
  • 简介:在microfluidic薄片的一样的地方包含同时的LIF和contactless-conductometric大小的一个联合察觉系统被描述。LIF测量根据共焦的原则被设计,一个家具contactless传导性察觉者在C4D被使用。两测量在混合物的分析互相独立、有益。影响反应的各种各样的试验性的参数被检验并且优化。表演被玫瑰精B的同时的察觉表明。并且结果证明联合察觉系统能易感知地并且可靠地被使用。

  • 标签: 感应荧光 电导率 检测方式 化学试验
  • 简介:Micro-depositionofanaluminumfilmof500-nmthicknessonaquartzsubstratewasdemonstratedbylaser-inducedforwardtransfer(LIFT)usingafemtosecondlaserpulse.Withthehelpofatomicforcemicroscopy(AFM)andscanningelectronmicroscopy(SEM),thedependenceofthemorphologyofdepositedaluminumfilmontheirradiatedlaserpulseenergywasinvestigated.Asthelaserfluencewasslightlyabovethethresholdfluence,thehigherpressureofplasmaforthethickerfilmmadethefreesurfaceofsolidphaseburstout,whichresultedinthatnotonlythesolidmaterialwassputteredbutalsothedepositedfilmintheliquidstatewasmadeirregularly.

  • 标签: 飞秒激光 激光诱导向前转移过程 铝膜 微沉积
  • 简介:Asanatomicemissionspectroscopytechnique,laser-inducedbreakdownspectroscopy(LIBS),firstproposedbyBreechandCrossin1962[1],hasattractedmuchaca-demicandindustrialinterestforitsuniqueproperties.Byfocusingapulsedlaserontothesurfaceofatarget,laser-inducedplasmascanbegenerated.Thesimplicityofsamplepreparationofthelaserablationprocessen-ablesLIBStodirectlyanalyzesolid,liquid,orgaseousmaterialsintheatmosphere,makingitaconvenienttoolforchemicalanalyses.TheuniquefeaturesofLIBSsuchasrequiringlittleornosamplepreparation,allowingre-motedetection,andfacilitatingmultipleelementalanal-yseshavecontributedtoitsrapiddevelopmentinrecentyears.

  • 标签: 物理学 LIBS