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1、Single-PhotonSynchronousDetectionCristianoNiclass,ClaudioFavi,TheoKluter,FrédéricMonnier,andEdoardoCharbonEcolePolytechniqueFédéraledeLausanneCH-1015LausanneSWITZERLAND1Abstract—AnovelimagingtechniqueisproposedforfullyCMOS[6].However,allthesemethodsstillsufferfromthedigitaldetectionofphaseandin
2、tensityoflight.AfullyfactthatthephasesignalisanalogandthusitneedsintegratedcameraimplementingthenewtechniquewasamplificationandA/Dconversiononapixel-by-pixelbasis.fabricatedina0.35μmCMOStechnology.WhencoupledtoaAsaresult,severalsourcesofnoiseandnon-idealitiesaremodulatedlightsource,thecameracan
3、beusedtoaccuratelypresentandmaybesevere.Moreover,inthisapproachandrapidlyreconstructa3Dscenebyevaluatingthetime-of-backgroundilluminationcaninprinciplebeeliminatedbyflightofthelightreflectedbyatarget.Inpassivemode,itvirtueofthefactthatitappearsasacommon-modesignalallowsbuildingdifferentialphase
4、mapsofreflectionpatternsacrossthedifferentialsignalofeachdetector.However,forimageenhancementpurposes.Testsshowthesuitabilityofwhensaturationisreached,thedifferentialsignalbeginstothetechniqueandconfirmphaseaccuracypredictions.compress,causingbackgroundeffectstoresurfaceandcontrasttobeslashed.I
5、.INTRODUCTIONEvaluationofintensityandphaseofanimpingingrayofInthispaperweproposeafullydigital,multi-pixelmulti-ormonochromaticlighthasshownitsusefulnessinaphasedetectionmethodbasedonsingle-photonavalanchenumberofapplications.Oneofthefirstapplicationsofdiodes(SPADs).Wecallthismethodsingle-photon
6、phase-basedimaginghasbeenhistoricallyopticalsynchronousdetection(SPSD).Inthismethod,aphotonrangefinding,wherethetime-of-flight(TOF)ofareflecteddetectedbyaSPADtriggersadigitalpulsethatisrayoflightiscomputedfromthephasedifferencebetweenaccumulatedinadigitalcounter.Thechargeredirectionofanoutgoing
7、andanincomingopticalsignal.Traditionally,conventionalmethodsisreplacedwithasimpletheevaluationofthephaseofalightsourceisperformeddemultiplexer.Differentlocationsforaccumulationareusingtechniquessimilartohomodyneandheterodynereplac
