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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。 z>p]/Sa (7~%B" 成像示意图 [1U{ci&=p 首先我们建立十字元件命名为Target 2qjyFTT NN mM#eB:4 创建方法:
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14-]esSa 面1 : <S&]$?`{Wi 面型:plane %jTw 材料:Air E>"8/ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box e,"FnW )P%4:P \C7q4p?8 辅助数据: Qh8C,"a 首先在第一行输入temperature :300K, R(`]n!V2 emissivity:0.1; \?dTH:v/E `,P
>mp)uU Wj tft% 面2 : +KP_yUq[ 面型:plane jqtVpNwM 材料:Air 86qcf"?E 孔径:X=1.5, Y=6,Z=0.075,形状选择Box -"tY{}z YD9!=a$ %I0}4$ 位置坐标:绕Z轴旋转90度, ^e%k~B^ WN\PX!K9
QAUykS8 辅助数据: 1mix+.d +99Bi2H}o 首先在第一行输入temperature :300K,emissivity: 0.1; e=L*&X g>T f"P$f8$ Target 元件距离坐标原点-161mm; "k, K ~@} #N9d$[R* 8i[LR#D) 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 _#vGs:-x& 1$( t}~UYG(h~ 探测器参数设定: ]x_F{&6U8 O2lIlCL 在菜单栏中选择Create/Element Primitive /plane bw5T2wYZ )qd={ 5*1#jiq 7>&1nBh. f tR;{. S (tEwXy 元件半径为20mm*20,mm,距离坐标原点200mm。 QTE:K? Y/D-V 光源创建: 7_%2xewV| s`1^*Dl%+ 光源类型选择为任意平面,光源半角设定为15度。 U{HML| n.ct]+L nALnB1 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。 =y<0UU Km"&mT $ 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&%vj.Kc 63C(Tp" 0Az/fzJlz 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。 gmDR{loX j.B>v\b_3 创建分析面: 8t=3 O{u[+g *v&*% B 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。 =]d^3bqN =hhvmo ~QCA -Yud 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。 xU:4Y0y8 wE4;Rk1 FRED在探测器上穿过多个像素点迭代来创建热图 v8 Ko+al {2 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。 <r3Jf}%tT 将如下的代码放置在树形文件夹 Embedded Scripts, dE GX3 - +N8aq<l ftaBilkjp 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。 IX.sy )$h-ZYc 绿色字体为说明文字, cd+^=esSO k% NrL@z '#Language "WWB-COM" ?b"Vj+1:x 'script for calculating thermal image map b|6 !EGh 'edited rnp 4 november 2005 5;(0 $4I nzWQQra|? 'declarations L^)qe^%3 Dim op As T_OPERATION 7IQqN&J Dim trm As T_TRIMVOLUME )vQNiik# Dim irrad(32,32) As Double 'make consistent with sampling 9cz )f\ Dim temp As Double mYzcVhV Dim emiss As Double vbedk+dd?A Dim fname As String, fullfilepath As String {KsVK4\r )tvc/)&A} 'Option Explicit y
qkX:jt CC>($k" Sub Main Vf$1Sj w 'USER INPUTS i(P>Y2s nx = 31 Lrlk* ny = 31 =EWD
|< numRays = 1000 7N6zqjIB minWave = 7 'microns @2?=3Wf maxWave = 11 'microns ey*,StT5a sigma = 5.67e-14 'watts/mm^2/deg k^4 F "!`X# fname = "teapotimage.dat" ~ur)fAuF2 tI'e ctn Print "" y}Cj#I+a Print "THERMAL IMAGE CALCULATION" GBW 7Y 5c)wZ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 w0aHEvH/ "raj>2@ Print "found detector array at node " & detnode TG?fUD V leR"j srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 -CwWs~! }FZp840 Print "found differential detector area at node " & srcnode *5^ze+: sI$:V7/! GetTrimVolume detnode, trm ^>eFm8`N detx = trm.xSemiApe f)WPOTEY dety = trm.ySemiApe 4 #G3ew area = 4 * detx * dety sE}sE=\ Print "detector array semiaperture dimensions are " & detx & " by " & dety Xz"
JY Print "sampling is " & nx & " by " & ny ?nY/, q& F\:{}782u 'reset differential detector area dimensions to be consistent with sampling XGL"gD
pixelx = 2 * detx / nx noFh p pixely = 2 * dety / ny f}A^]6MO: SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False =qan%=0"h Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ,znL,%s r^e-.,+ 'reset the source power (Y&R0jt SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) c'SM>7L Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" $*g{[&L|6 RR8U
Cv 'zero out irradiance array K:C+/O For i = 0 To ny - 1 %sYk0~E For j = 0 To nx - 1 ;>sq_4_ irrad(i,j) = 0.0 2 e) Next j Y/#:)(&@ Next i cS+?s=d 3$;J0{&[i 'main loop O$YJku EnableTextPrinting( False )
I)qKS@ l8eT{!4 ypos = dety + pixely / 2 {3jm%ex For i = 0 To ny - 1 CRP7U xpos = -detx - pixelx / 2 zv>ZrFl* ypos = ypos - pixely WReYF+Uen (gFQK[ EnableTextPrinting( True ) yZQ1]
'^31 Print i A7mMgb_ EnableTextPrinting( False ) H;4oZ[g 34HFrMi 3~#Z E;># For j = 0 To nx - 1 2nVuz9h $eTv6B?m xpos = xpos + pixelx K%o6hBlk_ ':9%3Wq]j 'shift source mOABZ#+Fk LockOperationUpdates srcnode, True 3XM Bu* GetOperation srcnode, 1, op f'8B[&@L op.val1 = xpos b6
J2*;XG op.val2 = ypos O(b"F?
w SetOperation srcnode, 1, op 1v+JCOy LockOperationUpdates srcnode, False +F#=`+V 3^uL`ETm@ 'raytrace ufHuI* DeleteRays btJ,dpir CreateSource srcnode }?\#_BCjx( TraceExisting 'draw 9J't[(
u|u ZP]2/;h 'radiometry WoC\a^V For k = 0 To GetEntityCount()-1 ^'
edE5 If IsSurface( k ) Then iPR!JX
_ temp = AuxDataGetData( k, "temperature" ) <T4 7kL I emiss = AuxDataGetData( k, "emissivity" ) ^^20vwq If ( temp <> 0 And emiss <> 0 ) Then TW;|G'}$ ProjSolidAngleByPi = GetSurfIncidentPower( k ) h+ `J=a|\ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) "H/2r]?GT irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi TZvBcNi End If 8+@1wks rF
<iWM= End If 4DG 9`5. a,F8+
Pb> Next k (@N~ j& 7N-CtQnv Next j , 4h!"c R(n0!h4 Next i v ](G?L9b EnableTextPrinting( True ) ,Yiq$Z{qQ #]N&6ngJ 'write out file x0TnS# fullfilepath = CurDir() & "\" & fname S|z( Open fullfilepath For Output As #1 ^"6D0!'N Print #1, "GRID " & nx & " " & ny jSOa Print #1, "1e+308" wd2P/y42;; Print #1, pixelx & " " & pixely ~0Q\Lp); Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 Z]1z*dv 8Pnqmjjj maxRow = nx - 1 VygXhh^7\ maxCol = ny - 1 ePu2t3E For rowNum = 0 To maxRow ' begin loop over rows (constant X) !<['iM row = "" ID{Pzmt- For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) pE YrmC row = row & irrad(colNum,rowNum) & " " ' append column data to row string T^-H_|/M Next colNum ' end loop over columns H8=vQy qAuUe=w%p Print #1, row Sf.8Ibw 7!` C TE Next rowNum ' end loop over rows ;{F;e)${M Close #1 z!t3xFN&/ '6Z/-V4k Print "File written: " & fullfilepath D;
35@gtj Print "All done!!" ~$TE End Sub /hA}9+/ TnZc.
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: s/p>30Fg ?6.KS [XY:MUe
找到Tools工具,点击Open plot files in 3D chart并找到该文件 =O}%bZ)Q 8t^;O! DlQ[}5STF 打开后,选择二维平面图: )4o=t.O\K zxynEdO
QQ:2987619807 V=8{CmqT
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