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FabricationandFlyerDrivingCapabilityCharacterisationofanIntegratedExplodingFoilInitiator         8 9 3

         compositionprocessat680℃,160Pa,andatthisstepwe          Theoutputfiberwasconnectedtotheexperimentalfix
         would getthe activated parylene monomer; Finally, the  ture,asshowninFig.4.ThePDV probepositionedatabout
         parylenemonomerwillpolymerizeonthesubstrateat25℃,   6-10mm awayfrom theEFIassembly,inaddition,thereisa
         10Paimmediately.                                     opticglasswindow betweenthem fortheprotectionofprobe
                                                              from impactdamage.















         Fig.1 FabricationprocessoftheintegratedEFI
                                                              Fig.4 PictureofEFIassemblyonexperimentplatform
           Forthefabricationofbarrel,theSu8photoresistwascoa    Afterthefiringsettriggered,thefoilbridgeexplodedim
         teddirectlyontheparyleneCfilm.Afterthedevelopmentpro
                                                              mediately.ThentheparyleneCfilm wouldbeshearedtoform
         cedure,wewouldgettheintegratedEFIcomponents.Thede   aflyerandsubsequentlyacceleratedtoahighspeed.There
         tailoftheintegratedEFIcomponentswasillustratedinFig.2.
                                                              flectionoflaserbeam bythehighspeedflyeriscollectedby
                                                              theprobeofPDV system andtheraw dateofbeatfrequency
                                                              signalwouldberecordedbytheoscilloscope.Inadditionthe
                                                              SlidingFastFourierTransform (SFFT)isperformedtoextract
                                                              thetimeresolvedbeatfrequencyfrom thecapturedsignalfor
                                                              thedeterminationoftheflyervelocity.
                                                                 ThePDV system wascarriedoutbyreflectingasingle
                                                              modelaserbeam from amovingsurface,andthencombining
                                                              thereflectedbeam withaportionoftheoriginalbeam,which
                                                              wouldproduce a beatfrequency between the two signals,
                                                              relatedtothevelocityby:
         Fig.2 SEM profileofEFIcomponents                       λ laser
                                                              v=   f                                       (1)
                                                                 2  beat
                                                                 Theoriginalconceptofvelocitymeasurementisshowed
         3 ExperimentalTechniques
                                                              inFig.5.
           AnEFIsystem consistsofasmallcapacitorchargedbya
         highvoltage,aswitch,an explodingfoilbridge,aplastic
         disk,abarrelandanexplosivepellet.Forvelocitymeasure
         ment,theexplosivepelletisreplacedbythelaserprobeof
         PDV,whichcoulddetecttheminiflyerandmeasuretheve
         locityofit.Theschemeoftheflyerlauncherandprobeconfig
         urationisillustratedinFig.3.



                                                              Fig.5 TheconstitutionofthePDVflyervelocitydiagnosticsystem

                                                             4 AnalysesandDiscussion


                                                             4.1 InfluencesofComponentsMaterialontheFlyerAccel
                                                                  erationCapabilityofEFI
         Fig.3 EFIassembledwithaflyervelocitydiagnosticprobe    Inthepresentwork,thebridgewidthofallthetestsam



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