pec电子工程英语证书考试-光电子学术语

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1、PEC电子工程英语证书考试-光电子学术语AABSORPTION-Lossesinanopticalfibercausedbythepresenceofsomeimpurities-iron,copper,cobalt,vanadium,andchromium.Foropticalfibers,evenoneortwopartsperbillionoftheseimpuritiesareconsideredunacceptable.ACCEPTANCEPATTERN-Curveoftotaltra

2、nsmittedlightplottedagainsttheincidentangleALPHANUMERICDISPLAY-ReadoutofnumbersandlettersANALOGDISPLAY-Readoutthatprovidesacontinuous,illuminatedmovementalongapredeterminedcalibratedpathtoprovideanindicationofadesiredmeasurementANALOGMETER-Readouttha

3、tprovidesacontinuousnumberedscalealongwhichapointermovesCCLADDING-Athinglassorplasticmaterialappliedtothesurfaceofafiberopticstrandcore,havinglessdensitythanthecore.Ifalightstrikestheboundarybetweenthetwomaterialsatasuitableangle,thelightisreflectedb

4、ackintothedensercore.CONNECTORINSERTIONLOSS-Lightloss,expressedindecibels(dB),causedbytheinsertionofamatingconnectorbetweentwosectionsofafiberoptictransmissionsystemCONTRAST-Thedifferenceinlightoutputbetweentheareasofadisplaythatareilluminatedandnon-

5、illuminatedCORE-Theinnersectionofafiberopticstrandmadeofeitherpureglass(silica)orplasticthroughwhichlightisguided.Typically,itisapproximately.01to.05inchesindiameter.CURRENTTRANSFERRATIO(CTR)-Ratioofanopto-coupler'soutputcurrenttoitsinputcurrentDDARK

6、CURRENT-Theoutputcurrentofaphotodetectorwithnolightatitsinput.DECODER/DRIVER-Acircuitthatconvertsdigitalinformationintoanalogvoltages,thenamplifiesthevoltagestoanadequateleveltoenergizetheelementsofadisplayDIGITALDISPLAY-Areadoutofalphanumerics(lette

7、rsandnumbers)asopposedtoanalogorlinearmeterindicationsDOMINANTWAVELENGTH-Thewavelengththatisaquantitativemeasureofthecoloroflightasperceivedbythehumaneye.DOT-MATRIXDISPLAY-Aformationofdotsarrangedinanarrayofrowsandcolumns,capableofbeingindividuallyil

8、luminatedtoproducealphanumericcharactersandgraphicsDYNAMICSCATTERINGLCD¯-OnetechniquethatcausesambientlighttobescatteredwhentheLCDsegmentsareproperlyenergized,producingareadoutEELECTROLUMINESCENT(EL)DISPLAY-Adisplayofsegmentsordotsoftransparentconduc