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简介:本文是以十字元件为背景光源,经过一个透镜元件成像在探测器上,并显示其热成像图。 gVs8W3GW UmRI! WQl 成像示意图 ATb[/=hP<R 首先我们建立十字元件命名为Target C
{GSf`D!T 0Q1sJDa. 创建方法: 8"\g?/ [e:mRMi 面1 : 7fg +WZ 面型:plane %;Dp~T`0 材料:Air ] hxE^/8 7 孔径:X=1.5, Y=6,Z=0.075,形状选择Box P;#}@ /E OEN!~-u +4,v.B@ 辅助数据: +Xg]@IS-eg 首先在第一行输入temperature :300K, p+;[i%` emissivity:0.1; ^\X-eeA -R[ *S " 3O:gZRxK 面2 : `6.rTs$< 面型:plane $1h , <$5H 材料:Air YRy5.F%? 孔径:X=1.5, Y=6,Z=0.075,形状选择Box jJN.( H
',Nt G@O~*k1v 位置坐标:绕Z轴旋转90度, O<1qU
M Zljj %b
H1We 辅助数据: [a&|c%h 4EO,9#0 首先在第一行输入temperature :300K,emissivity: 0.1; Fnnk}I} pL{h1^O} _IA@X. )? Target 元件距离坐标原点-161mm; AQ>8] `e` ="$9
<wt yJ(p-3O5 单透镜参数设定:F=100, bend=0, 位置位于坐标原点
vj+x( 5s >UM@}) nH#|]gVI 探测器参数设定: wX_s./#JJ _7AR2 在菜单栏中选择Create/Element Primitive /plane ?(&)p~o wz-#kH5? ;_.%S *W\ z8SrZ#mg 0$ -N [dK5kO 元件半径为20mm*20,mm,距离坐标原点200mm。 <_S>- ;by *LTFDC 光源创建: -/>SdR$D7 5$,dpLbL 光源类型选择为任意平面,光源半角设定为15度。
u;fD4CA rKR2v(c U{2[nF 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 )F\tU HMQi:s7% 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 m'))prl i )Hjmf3 (RP"VEVR 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 q;dg,Om |fx*F}1 创建分析面: OC$Y8Ofr yw|O,V<4N <<zYF.9L] 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 0-ISOA& n+Ia@$|m yG)zrRU 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 LV4]YC eIzT(3( FRED在探测器上穿过多个像素点迭代来创建热图 Gz]p2KBg f?_UT}n FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 3d qj:4[f 将如下的代码放置在树形文件夹 Embedded Scripts, os<B}D[ S\"/=|\ /bE=]nM 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 GXV<fc"1 ,O[HX?> 绿色字体为说明文字, vJ__jO"Sq R<}n?f\#JZ '#Language "WWB-COM" ;(cqaB 'script for calculating thermal image map 0B0Uay'd_ 'edited rnp 4 november 2005 qNI2+<u)j *_
2db 'declarations O1+2Z\F Dim op As T_OPERATION q[l!kC+Eh Dim trm As T_TRIMVOLUME Q+
r4 Dim irrad(32,32) As Double 'make consistent with sampling H"_ZqEg Dim temp As Double EgAM,\ Dim emiss As Double >wiW(Ki} Dim fname As String, fullfilepath As String s2-`}LL l6^IX0&p 'Option Explicit |!VSed#FSn Yx4TUA$c' Sub Main "*E#4e[ 'USER INPUTS h|^RM*x nx = 31
jpcbW ny = 31 w)A@ numRays = 1000 C?v_ig minWave = 7 'microns 1'c maxWave = 11 'microns 1]wx Ru sigma = 5.67e-14 'watts/mm^2/deg k^4 ?[n{M fname = "teapotimage.dat" U$;FOl ~)';[Ha Print "" V=)0{7-9 Print "THERMAL IMAGE CALCULATION" %d<uOCf\Q l+e L:C! detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 XH_XGzBQS 0'Kbh$LU Print "found detector array at node " & detnode |a7W@LVYD 95Q{d'& srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 t{\,vI RcQo1 Print "found differential detector area at node " & srcnode qJY'"_Q{ Lq#>N_72W0 GetTrimVolume detnode, trm 3z^l detx = trm.xSemiApe }pP<+U dety = trm.ySemiApe JZQT} area = 4 * detx * dety E;[ANy4L Print "detector array semiaperture dimensions are " & detx & " by " & dety %1E:rw@ Print "sampling is " & nx & " by " & ny RQzcsO n9.` 5BH7/ 'reset differential detector area dimensions to be consistent with sampling b2x8t7%O pixelx = 2 * detx / nx 7_,)"J2^ pixely = 2 * dety / ny Ok7i^-85 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False >Ux5UD Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 }]0f -} +b<q4W 'reset the source power ghXh nxG SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) j7&57' Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" o.qeF4\d6 &&Sl0(6x[T 'zero out irradiance array SDY!! . For i = 0 To ny - 1 ~-r*2bR For j = 0 To nx - 1 m2!y;)F0 irrad(i,j) = 0.0 5ZG-3qj Next j ,j{$SuZM Next i `4Jlf! v!oXcHK/ 'main loop 7x
*] EnableTextPrinting( False ) &|t*9D -p|@En n ypos = dety + pixely / 2 l56D?E8 For i = 0 To ny - 1 9UD~$_<\ xpos = -detx - pixelx / 2 <"|BuK ypos = ypos - pixely F-MN%WD~ Pb05>J3N EnableTextPrinting( True ) JJL#Y Print i *KF-q?PBb EnableTextPrinting( False ) oM`[&m., 3Lx]-0h xngK_n For j = 0 To nx - 1 G.KZZ-=_4 VGLE5lP X xpos = xpos + pixelx '%&i#Eb 9Ra_[1 'shift source 16q"A$ LockOperationUpdates srcnode, True Z!Y ^iN GetOperation srcnode, 1, op Xne{:!btw op.val1 = xpos N :E7rtT,M op.val2 = ypos pgg4<j_mn SetOperation srcnode, 1, op |2,'QTm= LockOperationUpdates srcnode, False v#EXlpS vO#4$, raytrace 5Qb%g)jZ DeleteRays 4zyy CreateSource srcnode H]a; <V9[ TraceExisting 'draw I4%&/~! S:qML]RO 'radiometry \TM%,RC3K For k = 0 To GetEntityCount()-1 V!=1 !"}OG If IsSurface( k ) Then @}&o(q1M0 temp = AuxDataGetData( k, "temperature" ) y:Ycn+X. emiss = AuxDataGetData( k, "emissivity" ) HhfuHZ< If ( temp <> 0 And emiss <> 0 ) Then 9;3f`DK@2k ProjSolidAngleByPi = GetSurfIncidentPower( k ) Z/=x(I0 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) nKn,i$sO/. irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi !Kv.v7'N/k End If ,@2d<d] 0*?~I;.2m$ End If ^hOnLy2 zItf>j7|Z Next k T9enyYt% OA#AiQUR Next j 3RpDIl`0 p;av63i Next i A!}Wpw%(/ EnableTextPrinting( True ) 3DRXao mO$]f4} 'write out file )ymd#?wq fullfilepath = CurDir() & "\" & fname FilHpnQCt Open fullfilepath For Output As #1 S[!-M\b Print #1, "GRID " & nx & " " & ny 6AgevyVG Print #1, "1e+308" =8`,,=P^ Print #1, pixelx & " " & pixely =VkbymIZ4y Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ol^J- nU$;W maxRow = nx - 1 4}sfJ0HhX maxCol = ny - 1 8/Z For rowNum = 0 To maxRow ' begin loop over rows (constant X) 2T!pFcc row = "" o@[yF< For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) `A O_e4D0i row = row & irrad(colNum,rowNum) & " " ' append column data to row string Y4,~s64e Next colNum ' end loop over columns (xffU%C^ T1ZAw'6(K
Print #1, row &CW,qY,sh =\7o@ 38 Next rowNum ' end loop over rows MH|!tkW>: Close #1 w|?<;+ &d]%b`EXq Print "File written: " & fullfilepath B5"(NJ; Print "All done!!" Q:$<`K4) End Sub hR"j[ #)`N 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: )F;`07 +Ze HZjd H)S&sx#q] 找到Tools工具,点击Open plot files in 3D chart并找到该文件 I,
9!["^| 8"R;axeD _SM5x,Zd 打开后,选择二维平面图: +VSJve | o9+"6V|.
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