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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。 47xJ(yO z Uqt^_ 成像示意图 I"^ `!8<q 首先我们建立十字元件命名为Target shwKB 5 uJ4RjLM` 创建方法: >uuP@j BOLG#}sm 面1 : J}qk:xGL 面型:plane P"%i 4-S 材料:Air $Blo`' 孔径:X=1.5, Y=6,Z=0.075,形状选择Box #k1%}k= qHfs*MBJ% z6vRTY 辅助数据: HPAd@5d( 首先在第一行输入temperature :300K, sH(AsKiNKe emissivity:0.1; \Clz#k8l1 ?]081l7cd `5;O|qRq 面2 : !Re/W
ykY 面型:plane i8w(G<Y= 材料:Air ^.F@yo2} 孔径:X=1.5, Y=6,Z=0.075,形状选择Box )p>BN|L m&DDz+g `Y-uNJ'.N 位置坐标:绕Z轴旋转90度, v6
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辅助数据: P@:#NU[ |<\LB 首先在第一行输入temperature :300K,emissivity: 0.1; g6$X { VkT8l4($X< G8@({EY Target 元件距离坐标原点-161mm; 2i#wJ8vrF YMwMaU)K, X&h4A4#P 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 u4NMJnX WEUr;f ;Br8\2=$ 探测器参数设定: k/O|ia6 vV-ATIf
^ 在菜单栏中选择Create/Element Primitive /plane ,)XT;iGQe D{h1"q @0?Mwy! /yyed{q H=z@!rJc. ePK^v_vBD 元件半径为20mm*20,mm,距离坐标原点200mm。 4s~YqP{K )MLOYX 光源创建: iCao;Zb gVsAz 光源类型选择为任意平面,光源半角设定为15度。 n[CESo%[ TS)p2# {QTfD~z^K 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。 "0+_P{w+ T.GY 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。 b~ ||cG/I&, BS>|M}G)r 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。 [ECSJc&i 6gJy<a3 创建分析面: bQow,vf 3zp)!QJi g4&zBn 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。 `{CaJ6. ,(}7 ST cfMj^*I 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。 mfQQ<Q@ C[gCwDwl FRED在探测器上穿过多个像素点迭代来创建热图 dY68wW>d| E:T<mI?d 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。 !m^;Apuy 将如下的代码放置在树形文件夹 Embedded Scripts, ?ah-x""Y ;&37mO/T 1Z6<W~,1OM 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。 BJ<hP9# SfyZ,0 绿色字体为说明文字, XU5/7
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*oL?R2#7 '#Language "WWB-COM" uDay||7^g 'script for calculating thermal image map ~dC)EG 'edited rnp 4 november 2005 b/5?)!I ++-HdSHY 'declarations Yw"o_ Dim op As T_OPERATION Q}d6+ C Dim trm As T_TRIMVOLUME S=~[ 6;G Dim irrad(32,32) As Double 'make consistent with sampling 6C4c.+S Dim temp As Double lPSyFb" Dim emiss As Double 3ox%1x NA Dim fname As String, fullfilepath As String oS0l Tf\ b4ZZyw 'Option Explicit 4Pe%*WTX rE;*MqYt& Sub Main __teh>MC 'USER INPUTS *9y)B|P^ nx = 31 m.pB]yq& ny = 31 c [sydl numRays = 1000 zUXQl{ minWave = 7 'microns 0f&B;?)! maxWave = 11 'microns 7"@^JxYN sigma = 5.67e-14 'watts/mm^2/deg k^4 VdjS\VYe, fname = "teapotimage.dat" _t||v JS<S?j?*/ Print "" &l"/G%W Print "THERMAL IMAGE CALCULATION" kfr' P u f6vhW66:?x detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 3_|<CE6 Xyy;BO: Print "found detector array at node " & detnode Atc9[<~WG c[J?`8 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 [Gop-Vi/~ Q)c3=.[> Print "found differential detector area at node " & srcnode Yz]c'M@ dv-L!C GetTrimVolume detnode, trm G
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v _ detx = trm.xSemiApe p.6C.2q~s] dety = trm.ySemiApe `|coA2$rw area = 4 * detx * dety TwlX'iI_; Print "detector array semiaperture dimensions are " & detx & " by " & dety iGB1f*K%x Print "sampling is " & nx & " by " & ny pMB!I9q }A jE- K{ 'reset differential detector area dimensions to be consistent with sampling ve($l"T pixelx = 2 * detx / nx mSLA4[4{ pixely = 2 * dety / ny |_."U9!Z^ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 2(LF @xb Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 */c4b:s ;\j7jz^uC 'reset the source power kvcDa+# SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) c?5?TJpm Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" !q\MXS($#u 5. ibH 'zero out irradiance array dUN{@a\R0 For i = 0 To ny - 1 QO2@K1Y For j = 0 To nx - 1 V=^B7a.;> irrad(i,j) = 0.0 G0#<SJ,) Next j !Gob `# r Next i YP
E1s /tm2b<G 'main loop m)AF9#aT2 EnableTextPrinting( False ) M~%P1@% &!P' M ypos = dety + pixely / 2 UE9RrfdN For i = 0 To ny - 1 yY[9\! xpos = -detx - pixelx / 2 |RjAp.pm ypos = ypos - pixely o|:c{pwq e!W U EnableTextPrinting( True ) Tp46K\}Uf Print i "@z X{^: EnableTextPrinting( False ) [ Y+Ta, X)e#=w!fi3 Sq&r
; For j = 0 To nx - 1 Qb%o%z?hee GCf,Gfmr xpos = xpos + pixelx b5Q|$E kEgpF{"%n 'shift source !"2S'oQKS LockOperationUpdates srcnode, True {Qi J-[q GetOperation srcnode, 1, op l1bkhA b
op.val1 = xpos }!Y=SP1e op.val2 = ypos Gv[s86AP, SetOperation srcnode, 1, op i0:1+^3^U LockOperationUpdates srcnode, False t4iD<{4 0iYo&q'n raytrace X=+|(A,BdY DeleteRays zO`4W!x& CreateSource srcnode _ amP:h TraceExisting 'draw _9g-D9 #M%K82" 'radiometry @Jx1n Q^ For k = 0 To GetEntityCount()-1 H;R~d%!b If IsSurface( k ) Then y8_$YA/g temp = AuxDataGetData( k, "temperature" ) ;j.-6#n emiss = AuxDataGetData( k, "emissivity" ) qJ sH If ( temp <> 0 And emiss <> 0 ) Then br^
A<@,d ProjSolidAngleByPi = GetSurfIncidentPower( k ) 2X<%BFsE frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) c/Fgx/hr irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi "OwK- End If a:8 MoH 4 d~AL4~} End If Gx
%=&O h%U}Y5Ps~ Next k 5 w(nttYH s7afj t Next j w3ATsIw O wuc9 Next i C{,^4Eh3r EnableTextPrinting( True ) p^|6 /b ~4pP(
JP 'write out file HMC-^4\%[ fullfilepath = CurDir() & "\" & fname LPBa!fq Open fullfilepath For Output As #1 7O'.KoMw Print #1, "GRID " & nx & " " & ny PW|=IPS Print #1, "1e+308" d!w3LwZ Print #1, pixelx & " " & pixely lP*n%Pn) Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 1
_Oc1RM %YK xdp maxRow = nx - 1 .dMdb7 maxCol = ny - 1 {1Y@%e For rowNum = 0 To maxRow ' begin loop over rows (constant X) #M{qMJHDo row = "" `3i<jZMG For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ,cL;,YN row = row & irrad(colNum,rowNum) & " " ' append column data to row string )l$}plT4 Next colNum ' end loop over columns (:qc[,m =w}JAEE|(i Print #1, row ,,BP}f+l$ 6F!B*lr Next rowNum ' end loop over rows 9Q^cE\j Close #1 Bcarx<P-p ^P^%Q)QXl Print "File written: " & fullfilepath @J&korU Print "All done!!" C+uW]]~I) End Sub *<W8j[? mM72>1~L* 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: |dqHpogh D/f4kkd +^lB"OcOX@ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 # H
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Syq}Y3 打开后,选择二维平面图: _<LL@IX A
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