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:100722276(2001)0220112206,,(,430074):,,,,,,:;;;:TN21:ASimulativecalculationmethodsofatmospherictransmittanceofLWIRunderseaandskybackgroundPENGDe2quan,ZHOUCheng2ping,DINGMing2yue(StateEducationCommissionKeyLaboratoryforImageProcessingandIntelligentControlInstituteforPatternRecognitionandArtificialIntelligenceHuazhongUniversityofScienceandTechnology,Wuhan430074,China)Abstract:Basedonoriginaltheoreticalcalculation,theexpressionofdepositvaporvolumeinatmosphereunderseabackgroundisdeduced,andcalculationofsaturatedwatervaporpressureinatmosphereismodified.Atmosphericmoleculeabsorptionindifferentheightisconsidered.Spectraltransmittancefunctionsofvaporandcarbondioxidearepresentedrespectively.Inaddition,theinfluenceofozoneisanalyzed.Expressionofatmo2spherictransmittanceisshown.Keywords:Infraredradiation;Atmospherictransmittance;Seaandskybackground;Simulativecal2culation1,,,,(),(N2)(O2)(CO2)(CO)(O3):2000207212;:2001201230:(19762),,,,,421130220014Vol.30No.2InfraredandLaserEngineeringApr.2001(78%)(20%)1%0.03%0.05%,,:(1);(2);(3)()a():a()=()P()r()(1)();P();r(),,,,,,;,;,;,,2(),p():p=3.91DV0q(2)DV;00.555m(0.61m);(m)(DV50km),q=1.6;(DV=10km),q=1.3;,(DV6km),q=0.585DV1P3;0.314m,q=1.3(2)p():p()=exp(-pR)=exp-3.91DV0qR(3)R10.6m:=0.66J0.66km-1(4)=6.5J0.7km-1(5)JJ,mmPh:()=exp(-R)()=exp(-R)(6)R:r()=()()(7)3814m3.1,,,,;,,O3,1040km,2030km4.8m9.6m14.2m9.6m311:,9.49.8m;,0.1;20km,O3,,O320km,O3;20km9.6m(9.49.8m),t1;814mt2,814m:O3=t1(9.8-9.4)+t2[6-(9.8-9.4)]P(14-8)=(0.4t1+3.6t2)P6(8)3.2,,SaDL(mm):=0D(9)0f=100%,mmPkmf=100%,,,,3.2.1nm(xi,yj)(i=0,1,,n-1;j=0,1,,m-1)zij,:f(x,y)=p-1i=0q-1j=0aijxiyj,y,xm,k(x)(k=0,1,,p-1),:f(x,y)=p-1i=0ijk(x),j=0,1,,m-10(x)=1,1(x)=x-0k+1(x)=(x-k)k(x)-kk-1,k=1,2,,p-1:dk=n-1i=02k(xi),k=0,1,,p-1:k=n-1i=0xi2k(xi)Pdk,k=0,1,,p-1k=dkPdk-1,k=1,2,,p-1:kj=n-1i=0zijk(xi)Pdkk=0,1,,p-1;j=0,1,,m-1,y:hk(y)=q-1l=0ukll(y),k=0,1,,p-1l(y)(l=0,1,,q-1),:0(y)=1,1(y)=y-0l(y)=(y-l)l(y)-ll-1(y),l=1,2,,q-1:l=m-1j=0l2(yj),l=0,1,,q-1:l=m-1j=0yj2l(yj)Pl,l=0,1,,q-1l=lPl-1,l=1,2,,q-1:kl=m-1j=0kjl(yj)Plk=0,1,,p-1,l=0,1,,q-1:f(x,y)=p-1k=0q-1l=0klk(x)l(y):411:f(x,y)=p-1k=0q-1l=0aijxiyj,,xiyj:xi3=xi-x0,i=0,1,,n-1yj3=yj-y0,j=0,1,,m-1x0=n-1i=0xiPn;y0=m-1j=0yiPm,:f(x,y)=p-1i=0q-1j=0aij(x-x0)i(y-y0)j(10)3.2.2,;,,:0=2.167104Tfe(11)f(%);e,Pa;T,Ke:e=6.10810-4Ksexp19.851-273.16T(Pa)(12)T,K;Ks,(s):Ks=1-0.527s(13)(10):fH2O(,w)=6i=05j=0aij(-1)i(-1)j(14)aij;;;1;1,:fCO2(,D)=6i=05j=0bij(-1)i(D-D1)j(15)bij;;D;1;D13.3(1)H2O()tB,R,(11)0,Hr,0(Hr),:=0(Hr)R=0RHr(16),(14),H2O()(2)CO2(),,CO2,,CO2,,CO2()CO2()(15)3.4511:,,,,,,:e=0Hre-0.5154H1-e-0.5154H20.5154cos(17)eH1H2;Hr;()H1=0,H2=H,:e=0Hr1-e-0.5154H0.5154cos(18),,:Re=e-0.313H1-e-0.313H20.313cos(19)ReH1H2;(17)0H,H1=0,H2=H,:Re=1-e-0.313H0.313cos(20)3.5:(1)1),(11)Hr=100%,0;2)();3)e,:e=0Hr();4),H2O()(2)CO21),,,(19)(20)Re;2),CO2CO2()(3)O3:(8)O3()(4)(),:()=H2O()CO2()O3()(21)4812m280km66.42(ab),11Fig.1ImagingofFLIR1,:(3%,,a[i][j]),2(812m,1),:,,611:1Tab.1ComparisonoftransmittancebeforeandafterfittedWavelength(m)Atmospherictemperature()Atmospherichumidity(%)SeawatersalinityAtmosphericvisibility(km)Amountofrainfall(mmPh)Amountofsnowfall(mmPh)FittedornotTransmittance1120800.0353000Yes0.3395331120800.0353000No0.330420920800.0353000Yes0.259930920800.0353000No0.2574282Tab.2ComparisonofatmospherictransmittancebetweenconsideringallfactorsandpartoffactorsHeightandtiltconsideredSeawaterconsideredConsiderabsorptionofozoneAverageatmospherictransmittanceWarp(%)YesYesYes0.27705600(Standard)NoYesYes0.0000000100YesNoYes0.26682303.7YesYesNo0.30445729.9NoNoNo0.0000000100:[1]KneizysFY,ShettleEP,GallergWO.Atmospherictransmit2tancePradiance:TheLOWTRAN5Code[J].SPIE,AtmosphericTransmission.1981,277:119.\;[2]Hans2JurgenBolle,etal.Investigationoftheinfraredemissionspectrumoftheatmosphereandearth[R].AD2278155.[3].[J].,1998,6(4).[4][]BT,[]N,[Z];,1994.[5].[M].:,1992.[6],,.[M].:,1989.[7][]EB;.[M].:,1979.[8],,.[M],:,1986.[9].[J],,1998,9(1).,,,(AIAA);,,,16,80,,():62133711: