Single photon synchronous detection04681805

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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