串級散斑統(tǒng)計性質(zhì)與散射表面參數(shù)關系的研究.pdf

1、天津大學碩士學位論文串級散斑統(tǒng)計性質(zhì)與散射表面參數(shù)關系的研究姓名：尚可可申請學位級別：碩士專業(yè)：光學指導教師：劉迎2002.1.10AbstractThepaperinvestigatedthefirst—orderstatisticalpropertyandsecond。orderstatisticalpropertyofcascadedspecklethroughallidealimagingsystemBasedonthetheo

2、ryanalysis，wefurtherresearchedthepropertyofcascadedspecklebycomputersimulationandexperimentInthepaper，wediscussedtheconditionofbeingGaussianspeckle、theprobabilitydensityofspecklefieldandtherelationofTime—correlationfunct

3、ionsanddiflusersInthepaperanewmethodofsimulatingtherandomdiffuserwasusedThroughsimulatingtheconditionofbeingGaussianspeckle，wefoandthatlhestatisticalpropertyofspecklefieldchangesgreatly，andthatthespecklefieldownssomestat

4、isticalpropertyofOaussianspecklefield，whentheroughnessofthediffuserexceedshalfofwavelengthoftheincidencelaserInsimulatingthedynamicpropertyofcascadedspecklewegotthefollowedresults：l，therelationof1／T(thereciprocalofthetim

5、e—correlationlength)andv(thevelocityofthemovingdifluser)islinearity2theloopofthelineincreaseswiththeincreaseofthemovingdiffuser’Sroughnesswhentheroughnessexceedshalfofwavelengthoftheincidencelaser3thephenomenondisappears

6、whentheroughnessiSsmallerthanhalfofwavelengthoftheincidence1aser4thelcopofthelinedecreaseswiththeincreaseofthecorrelationlengthofthemovingdiffuserInsimulatingtheeuquiprobabilitydensityellipseofsinglespeckleandcascadedspe

7、cklewefoundtlatthespecklefieldofcascadedspecklebecomesGaussianspecklefieldmorequicklythallthatofsinglespeckleIntheend，weresearchedthepropertiesofdynamicspecklebyexperimentandcomparedtheresultsgotfromtheoreticalanalysis，c