简介:Parameterquantificationprincipleofthree-dimensional(3-D)fluorescentspectrumanditsrealizationtechniquearestudied.Thepotablefiberopticfluorescentmeasurerformineraloilisgiven.Threeparametersoftheexcitinglightwavelength.theeavelengthandtheintensityofthefluorescentlightexcitedbythemeasuredoilareexpressedwith3-Dcoordinatesandareprocessedsoastobesampledagainandtobecurvefitted.
简介:在里面三维(3D)轮廓测量,阶段移动profilometry(PSP)方法是广泛地使用的大多数一个。然而,因为多重设计,PSP的测量速度是很低的。以便改进测量速度,颜色栅栏条纹在这份报纸被用于测量。在测量期间,一仅仅颜色正弦曲线穗在测量目标上被投射。因此,测量速度极大地被改进。自从正在联合或在邻近的颜色栅栏条纹之间的干扰现象,一个颜色修正方法被用来改进测量结果。在修正在修正前比那好以后,为改正测量系统的非线性的错误的一个方法在这份报纸,和获得的图象的正弦曲线性质被建议。试验性的结果证明与这些修正方法,测量错误能被减少。因此,它能为高精确的3D重建支持一个好基础。
简介:Analternativemethodisproposedinthisletterfordescribingthearbitraryshapeandsizeforgranulesin2Dimage.Afterimagebinarization,theedgepointsoncontouraredetected,bywhichthecentroidoftheshapeinquestionissoughtusingthemomentcalculation.UsingPrincipalComponentAnalysis(PCA),themajorandminordiametersarecomputed.Basedonthesignaturecurve-fitting,thefirst-orderderivativeistakensoastoseekallthecharacteristicvertices.Byconnectingtheverticesfound,thesimplifiedpolygonisformedandutilizedforshapeandsizedescriptivepurposes.Thedevelopedalgorithmisrunontwogivenrealparticleimages,andtheexecutionresultsindicatethatthecomputedparameterscantechnicallywelldescribetheshapeandsizefortheoriginalparticles,beingabletoprovideaready-to-usedatabaseformachinevisionsystemtoperformrelateddataprocessingtasks.
简介:Inordertoobtainthethreedimensional(3D)fluorescencespectradirectlyandrapidlybyinsituandinvivophytoplanktonmonitoring,aprototypeoceanlidarsystemwiththeabilityofmeasuring3Dfluorescencespectraisdeveloped,inwhichanopticalparametricoscillator(OPO)andagratingspectrometerareemployed.Usingthesystem,the3Dfluorescencespectraoffivetypicalred-tidespeciesintheEastChinaSeaaremeasuredinlab.Thepreliminaryexperimentalresultsshowthefeasibilityofmonitoringandclassifyingphytoplanktonbythisoceanlidar.
简介:Anovellow-cost4-elementplanararrayantennadirectlyfedbyacoaxialcableforUltra-WideBand(UWB)applicationispresented.Theproposedantennaconsistsof2×2bowtieelementsandasimple1:4powerdividerfeedingnetwork.Comparedtothebasicbowtieelement,theimpedancebandwidthofthearrayantennahasasignificantimprovementthatthelowcut-offfrequencyisextendedfrom6GHzofthebowtieelementto2GHz.Themeasuredresultsshowthattheproposedantennahasalargebandwidthof2GHzto11GHzforVoltageStandingWaveRatio(VSWR)<2,andexhibitsabidirectionalradiationpatternandamodestgainacrosstheoperatingbandandapeakgainofabout9dBiat11GHz.
简介:AnewcompactopticalFanofiltersuitableforbiologicalsensingisproposed,whichpatternsphotoncrystalinsinglecrystallinesiliconnanomembranes(SiNMs)andtransferringontotransparentglasssubstrates.Theeffectsofairholesizeandsiliconthicknessonthetransmissioncharacteristicsofnewfilterarenumericallyinvestigatedbyusingthree-dimensionalfinite-differencetime-domain(FDTD)technique,thespectralresponseisalsostudiedbyback-fillingbioliquid.Theresultsshowthatthedipwavelengthwillshifttowardlongerwavelengthbyeitherreducingairholeradiusorfillingbio-liquid.Thenumberofdipswillincreasewiththeincreaseofsiliconthickness.Thesizeofproposedfiltercanbelessthan1mm2.
简介:Toquicklyobtainaccurate3Ddataofdentalcastmodel,thispaperproposesa3Dreconstructionmethodfordentalcastmodelbasedonstructuredlight.Thismethodcombinesthestructuredlightwiththemotorturntabletoobtainagroupof3Ddataforthedentalcastmodelfrommultipleangles,andautomaticallyregistersthedental3Ddatafrommultipleanglesthroughtheballcalibrationofturntable.Comparedwiththerealdataofthedentalcastmodel,themaximumerrorofthe3Dreconstructionresultsinthispaperis0.115mm.Thereconstructiontimeofthisprocessisabout130s.Theexperimentalresultsshowthatthemethodhashighprecisionandhighscanningspeedforthe3Dreconstructionofthedentalcastmodel.