DOMAILLE ENGINEERING DE2510 Series User guide

DE2510Series–User’sGuide

BarefiberInterferometer



Features:

 HighresolutionvideoandCCDcamera

 20xnon‐contactinterferometer

 Pitch‐Yawstageforfiberalignment

ManufacturedbyDomailleEngineeringLLC,theDE2510SeriesVideoMicroscope

aredesignedforvisualend‐faceinspectionoffiberopticconnectorsina

productionenvironment.

DE2510:Equippedwitha±20°tiltinggoniometerandinterferometer,thismodel

isprimarilyusedforbarefiberinspection.

Withinthismanualisalltheinformationneededtooperateandmaintainthe

DE2510SeriesVideoMicroscope.DomailleEngineeringLLC,isalwaysdesigning

innovativenewproductswhilemaintainingandfurtherdevelopingexistingones.



PrintingHistory

Edition2,April2014

©Copyright2014byDomailleEngineeringLLC

Parts&Functions

(Chart&Image)

InitialSetup

AfterunpackingtheME2510seriesmicroscopeandaccessories,setupcanbequicklyachieved

throughafewsimpleconnections.Therearethreemaincomponentstothemicroscopesystem,

themicroscope,powersupply,andmonitor(orcomputerusingaframegrabber).

TheME‐12013LEDControlleroperatesfroma24voltDCoutputpoweradapter(ME‐12015)with

switchingtransformertoacceptACvoltage90‐240volt,50‐60Hzfordomesticorinternational

use.ThisunitisusedtopowerboththeCCDCameraandtheilluminationofthemicroscope.

Currentlyweprovidetwodifferentmanufacturer’smodelmonitors,inseveraldifferentsizes.

Thesemonitorsarehighresolutionmonitorsspecificallychosentoprovidethebestsolutionfor

inspectingconnectorend‐faces.Wedonotrecommendanyofthelowerpricedsecuritytype

monitorsastheresolutionandimagequalityarenotsufficient.Acomputermayalsobeusedto

captureimages,contactDomailleEngineeringformoreinformationondigitalcameraoptionsor

videoframegrabbers.

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Focusing

ThefocusadjustmentknobontheDE2510seriesisconvenientlylocatednexttothestage.

Turningtheknobadjuststhecontrastoftheimagewithprecisionandcontrol.

Clockwise=Focusesthestagein

Counter‐Clockwise=Focusesthestageout

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Lighting

TheilluminationcanbecontrolledusingtheintensitycontrolknoblocatedontheME‐12013

LEDController.Thisallowstheoperatortocontrolthebrightnessoftheimagewheninspecting

thedarkfibercladdinghighlyreflectivemetalorceramicferrules.

Forgreateramountofcontroloverthelighting,theME‐12013LEDControllerisequippedwith

a3turnelectronicrheostat.OlderanalogmodelsmaybeupgradedbycontactingDomaille

Engineering.

Clockwise=IncreasesIllumination

Counter‐Clockwise=DecreasesIllumination

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ChangingMagnifications

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TheDE2510isequippedwiththreeobjectiveslenses:5x,10x,anda40x.Mountedtoatypical

microscopeturretornosepieceallowstheoperatortoquicklychangemagnificationswhen

inspectingconnectors.Optional3.3xand40xobjectivesareavailable.

Formoreinformationonmagnificationorcalibrationseeourwebsiteat

www.DomailleEngineering.com



UsingtheScope

StageAdjustments

1. FocusorY‐axisadjustmentmovestheentirestageassemblyforwardandbacktofocus

thefiber.

2. HorizontalorX‐axisadjustmentmovesthebarefiberholderlefttoright,alongthe

horizontalplane.

3. VerticalorZ‐axisadjustmentmovesthebarefiberholderupanddownalongthe

verticalplane.

4. Pitchadjustmenttiltstheangleofthebarefiberholderfromtheforetoaft.

5. Yawadjustmentrotatesthebarefiberholderfromlefttoright.

AdjustingBareFiberHolder

Dependingonthediameterofthebarefiber,itmaybenecessarytoadjustthesetscrewsto

applythecorrectamountoftensiontosecurethefiber.

1. Placethefiberintothefiberholderandclosethedoor.

2. SlowlytightenthesetscrewclosesttotheobjectivesuntilthefiberwillNOTslideinand

out.

3. Tightenthe2ndsetofscrewsforaddedsupport.

4. Whenthefiberneedstoberotated,simplyliftthedoorbeforerotating.

AlignmentofStage

Itisnecessarytomakesurethatthebarefiberholderisperpendiculartotheopticsinorderto

getacorrectcleaveanglecalculationusingtheinterferometer.

1. Placethecalibrationpininthebarefiberholder,makingsurethepinissecureatthe

bottomofthe“V”

2. Usingthe5xobjectivelensfocusonthecalibrationpinandcentertheimageusingtheX

andZaxisadjustments.

3. Repeattheprocessusingthe10xand20xobjectivestomakesurethepinisvisibleon

themonitor.

4. Usingtheinterferometer,focusinonthecalibrationpinfringes.

5. UsingthePitchandYawadjustmentsonthestage,tiltthestageuntilonly1fringeis

visible.

6. Rotatethecalibrationpinandcheckthefringesagain.Oncethecalibrationpincanbe

rotatedatanydegreeand1fringeismaintainedthestageisperpendiculartotheoptics.

Procedureforcheckingbarefibercleave

Thenon‐contactinterferometerlensprovidesvaluableinformationaboutthetopographyof

thefiberendface.Thispatternofthesurfacealsooffersinformationaboutthequalityofthe

cleavingtool,breakpoint,andanystressthatmayhaveoccurredduringthebreak.

1. Placethebarefiberintheholder,makingsurethepinissecureatthebottomofthe

“V”.Itisrecommendedtoleaveapprox.3mmoffiberstickingoutbeyondtheholder.

2. Usingthe5xobjectivelensfocusonthecalibrationpinandcentertheimageusingtheX

andZaxisadjustments.

3. Repeattheprocessusingthe10xand20xobjectives.Usethe20xobjectivetocheckthe

surfacequalityofthecleaveforchips/debrisand/orhackle(roughsurfacearea).

4. Usingtheinterferometer,adjustthefocuscarefullyuntilthefringescomeintoclear

view.

5. Onceyouhaveaclearimagewiththeinterferometer.Rotatethefiber(simplyliftthe

dooronthefiberholdertorotate)andfocustheinterferometeragain.Thesamefringe

patternshouldbemaintained.Ifnotthestagemayneedtobere‐aligned.

6. CountthenumberofDARKfringestocalculatecleaveangle.Refertothechartonthe

(nextpage).



InterferometricAnalysisofCleavedFiber

Thefringecountwillvaryaccordingtodifferentfiberdiameters

Pleasenote:Themarginoferrorasresultoffixturesormisalignmentoftheholdercanbe±

1.5fringes.

FRINGESPERDEGREEFORVARIOUSFIBERDIAMETERS

FiberDiameterFringeCountPerDegree

80µm5.8

125µm8.9

140µm10.1

230µm16.7



TheangleofthefibercanbecalculatedbycountingthenumberofDARKfringesonthefiber

endfaceanddividebytheappropriatecountoffringesperdegree.Typicalcleaveanglesare1

degreeorless.



Calculationsbehindtheanalysis:

Tangentof1degree=H÷D=Nλ ÷2D

Tangent of 1 degree = 0.01745

H = Height of the fiber away from the reference mirror inside of the micrometer

D = Diameter of the fiber in microns

N= Number of fringes per degree

λ = Wavelength of light ( blue LED is approx. .480 microns)

λ÷2 = Height of 1 fringe

Using a 125 micron fiber as an example:

0.01745 = (N x .480) ÷ (2 x 125)

N = 8.9

Using a 80 micron fiber as an example:

0.01745 = (N x .480) ÷ (2 x 80)

N = 5.8

Interferograms Representing Individual and Combinations of Aberrations

Preventive Maintenance

Caution:

Thefollowinginstructionsshouldonlybeperformedbyqualifiedservicepersonnel.



Ifequipmentisusedinamannernotspecifiedbythemanufacturer,the

protectionprovidedbytheequipmentmaybeimpaired.



ThereisNOSERVICEABLEEQUIPMENTinsidetheME‐12013LEDController.All

equipmentrequiringrepairshouldbesentbacktothemanufactureroran

authorizeddealer.



Note:TheDE2510seriesmicroscopeisrelativelylowinmaintenance.Basiccareandprecautioninusing

theinstrumentisrequired.Dependinguponthecleanlinessofthegeneralworkingareaaswellasthe

ageoftheequipment,wewouldsuggestatleastsemi‐annualserviceandmaintenance.



GeneralCleaning

Harshsolventsarenotrecommendedonaregularbasis.Typicalsafedegreasersolventscanbe

usedtocleanoldgreaseorgrimefrommechanicalparts.Lenscleanerissafetouseonthe

opticsofourmicroscopes.Lenscleanercanbeusedwithasoftlenstissue/clothtoremoveany

soil,fingerprints,etc.Fromthefrontoftheobjectives.



Centeringtheillumination

CenteringtheilluminationoftheDE2510iscriticalinordertomaximizeperformanceofthe

microscope.Allscopesaresetupfromthefactory,butreplacinglampsorperiodiccleaningof

thebeamsplittermayrequiretheoperatortore‐centertheillumination.

1. Usinga3/32”hexwrench,loosenthefoursocketheadscrewssurroundingthelight

block.

2. Whileviewingafiberonthemonitor,slidethelightblockarounduntilthegreatest

amountoflightisoverthecladdingareaofthefiber.

3. Re‐tightenthefourscrews.



Incorrect Illumination:

Notice how the light is towards the bottom of the screen.



Correct Illumination:

Notice how the light surrounds the cladding. Light scratches can now be easily detected.



Cleaningobjectivelenses

Oils,dirt,andfingerprintsmayreducetheresolvingpoweroftheobjectivelenses.Toensure

maximumlevelsofperformanceoftheDE2510series,wipethelensoftheobjectiveswitha

lint‐freetissueandlenscleaner.Ordinarylenscleaner,availableatmostphotographysupply

storesworksthebest.Performthisprocedureweeklyorasneeded,dependingonthetypeof

environmentinspectionisbeingheld.



CleaningtheCCDCamera

Useextremecautionwhenattemptingtocleanthecamera.Anyscratches,solvent,streaksordirtleft

ontheIRfilteroftheCCDwillshowupinthefieldofviewofthemicroscopes.



BeforeattemptingtocleantheIRfilterontheCCDcamera,firstconfirmthatthevisibledirton

themonitorisactuallyonthecamera.Whileviewingthesuspecteddirtonthevideomonitor,

slowlyrotatetheCCDcameraontheMicroscope.



DuetotheorientationoftheCCD,ifthedirtremainsinthesamespotanddoesnotrotatewith

thecamera,thenitmostlikelyisonthecameraitself.



1. Carefullyunscrewthecamerafromthecameramount.

2. Usingclean,compressedair,blowacrossthesurfaceoftheIRfilter.

3. Recheckthecamerafordirt.

4. Ifthedirtisstillthere,useplastictweezers,softlensclothandlenscleanertocarefully

wipethesurfaceoftheIRfilter.Useawipingspiralpatternfromcenteroffilteroutto

edges,toremovedebris.

5. Re‐checkthecamerafordirt.

6. Repeatthisprocessuntilthecameraisclean.



BlowairacrossandnotdirectlyattheCCDsensorofthecamera.



Determiningactualmagnification

Thebestmethodtocalculatetheexact“total”magnificationusedontheDE2500seriesisto

measurethecladdingonthevideodisplay.Takethemeasurementinmillimetersanddivide

thatamountbythe125microncladding.Theresultisthe“total”opticalandvideo

magnificationbeingused.



Forexample:takingasetofcalipers,wemeasuredthediameterortheferruleviewedthrough

DE2510onamonitortobeapproximately



Actualsizeondisplay/claddingdiameterinmm=totalmagnification

53.49mm/.125mm=427.92X



Lubricatingthefocusmicrometer

Occasionallubricationofthefocusmicrometerwillensureaccurateandrepeatableresults.

1. Unscrewthefocusknobandcarefullyremovethemicrometerdrum

2. Cleanthemicrometerdrumwithdegreaser

3. Lubricatethedrumandthreadswithalightgrease

4. Carefullyreplacethemicrometerdrumbyscrewingitbackintothehousing.



DOMAILLE ENGINEERING DE2510 Series User guide

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