利用胶片长度计算一次透照长度L_3和最小焦距F

L3F(,138008)CALCULATIONOFSINGLEEXPOSURELENGTHL3ANDMINIMALFOCALLENGTHFBYMEANSOFFILMLENGTHLIUHua2gang(BoilerPressureVesselTestStation,QianguoOilRefinery,SongyuanJilin138008,China):TG115.28:B:100026656(2002)0520225202,310m,1030mm100%,,,,,,,,,L3F1JB47301994,AB,K1.031A,B,,10mmA,B1:2001204224A,B,ABLeffLeffLeff=l-20mm(1)l1AAD,L2=L2tgL2TLL=2TtgK=1.03=cos-111.03=13.86L=2Ttg13.86=0.49TT2(2)1,L3L3=Leff-L2-L2=Leff-L=Leff-T2L3=l-20-T2(3)PAC,,L1L1=L32cot=L32cot13.862L3(4)1PAC,,FF=Leff2cot=Leff2cot13.862Leff(5)52224520025NDTVol.24No.5May2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2,300mm,,,,2,A,B,AB,Leff=l-20mmL2=AC=DBTtgL=2Ttg2AB,Tndo,K=1.1=cos-111.1=24.62L=0.92T(6)L3L3=CD=Leff-L2-L2=Leff-LL3=Leff-0.92T(7)2=360diCD()L3L3=AB=do3602L3=dodiCDL3=dodiL3(8)di,do2,PAO,L1+Rsin(180-)=Rsin(-)L1+Rsin=Rsin(-)L1=Rsinsin(-)-R(9)RF=L1+T=Rsinsin(-)-R+T3(FR)3,FR,A,B,A,B3Leff=AB=l-20mm(10)L3=Leff-2TtgAB,Tndo,K=1.1=cos-111.1=24.62L3=Leff-0.92T(11)2=360doCD=360doL3L3=di3602L3=didoL3(12)OPB,R-Fsin=rsin(+)rF=R-rsinsin(+)(13),,,622:L3F'1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.