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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,theSu8photoresistwascoa Afterthefiringsettriggered,thefoilbridgeexplodedim
teddirectlyontheparyleneCfilm.Afterthedevelopmentpro
mediately.ThentheparyleneCfilm 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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