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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。 [{>1wJ Pdj >oi?aD% 成像示意图 =L?2[a$2; 首先我们建立十字元件命名为Target n7/&NiHxv/ Vkf{dHjW 创建方法: ZC^NhgX Q^xk]~G$( 面1 : N>)Db 面型:plane Ue>{n{H"y 材料:Air ZhC,nbM 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ttBqp|.?S U+["b-c mO8/eVws[M 辅助数据: <29K!
[ 首先在第一行输入temperature :300K, 5x,/p emissivity:0.1; gr@Ril^ 50T^V`6 `9T5Dem|# 面2 : /wP2Wnq$ 面型:plane & Yx12B\ 材料:Air `UqX`MFz 孔径:X=1.5, Y=6,Z=0.075,形状选择Box [1z.JfC :S B;piO-hH H_aG\
位置坐标:绕Z轴旋转90度, h7o.RRhK U: )Gc G9GLRdP 辅助数据: |goK@< +NiCt S 首先在第一行输入temperature :300K,emissivity: 0.1; sN#ju5 n@q-f-2 hp2$[p6O Target 元件距离坐标原点-161mm; mGkQx
-| _qo\E=E v?%vB#A^ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 [r'A8!/|[ cF?0=un dt"& 探测器参数设定: } .<(L M9Nr/jE 在菜单栏中选择Create/Element Primitive /plane $3%+N|L
deTD|R $~%h4 L1y71+iqU K{B| ~CdW:t 元件半径为20mm*20,mm,距离坐标原点200mm。 n.C5w8f qL[SwEc 光源创建: XGjFb4Tw7 \wK4bvUrX 光源类型选择为任意平面,光源半角设定为15度。 f/iMI)J RAuVRm=E N0JdU4' 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 >[~7fxjK- !_B*Po 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 @~UQU)-( xH}bX- m DQaE9gmC 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 DVJn;X^T: XP?)xDr8 创建分析面: Z_Y'#5o# \<G"9w PrA(==FX/ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 Xil;`8h >7S@3,C3ke O}p<"3Ub 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 LIQ].VxIs xtLP4VL FRED在探测器上穿过多个像素点迭代来创建热图 Q;A\M mVh;=>8K FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 ik;F@kdm` 将如下的代码放置在树形文件夹 Embedded Scripts, M CP GDr z0 #2?o EbVva{;#$; 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。 DH.UJ+ PL3hrI 5 绿色字体为说明文字, XrWWV2[ +lhCF*@*N '#Language "WWB-COM" =Vazxt@[ 'script for calculating thermal image map +%u3% } 'edited rnp 4 november 2005 c"pOi& aql8Or1[ 'declarations = Dim op As T_OPERATION \<09.q<8 Dim trm As T_TRIMVOLUME {IaDZ/XS6 Dim irrad(32,32) As Double 'make consistent with sampling 5Z5x\CcC3 Dim temp As Double L[,19;( Dim emiss As Double cC NRv$IO\ Dim fname As String, fullfilepath As String D|Wlq~IpQ zNdkwj p+ 'Option Explicit ~id:Rh>o ;ko6igx)+ Sub Main oD1k7Gq1 'USER INPUTS 5b*knN> nx = 31 <JU3sXl ny = 31 o)^Wz numRays = 1000 CH
29kQ minWave = 7 'microns 0K26\1 maxWave = 11 'microns bv b\G sigma = 5.67e-14 'watts/mm^2/deg k^4 ( N};.DB1Y fname = "teapotimage.dat" vv{+p(~**O +@?'dw Print "" v+W'0ymbnV Print "THERMAL IMAGE CALCULATION" f.+1Ubq!5 hh&$xlO)(v detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 f5FEHyj| a !%,2|U Print "found detector array at node " & detnode .9PT)^2 3}F>t{FDk srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 DL1nD5 Q{L:pce- Print "found differential detector area at node " & srcnode ' BS.:^ q!@!eC[b GetTrimVolume detnode, trm ]a4+] vLK detx = trm.xSemiApe kP ,8[r dety = trm.ySemiApe ?4Rd4sIM$u area = 4 * detx * dety m m`#v
g, Print "detector array semiaperture dimensions are " & detx & " by " & dety "QxULiw Print "sampling is " & nx & " by " & ny !$oa6*<1 dnU-v7k,{ 'reset differential detector area dimensions to be consistent with sampling Br7q. pixelx = 2 * detx / nx 3IlVSR^py pixely = 2 * dety / ny k:R\;l5 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False k4{|Xn
Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 iaeNY;T Zd>sdS`#r 'reset the source power x5BS|3W$a SetSourcePower( srcnode, Sin(DegToRad(15))^2 )
h-?yed*? Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" jYRSV7d V3q`V/\ 'zero out irradiance array 5)lcgvp For i = 0 To ny - 1 W/>a 1 For j = 0 To nx - 1 \GxqE8 irrad(i,j) = 0.0 o
/[7Vo Next j ;M4[Liw~O Next i ]Z8u0YtM) 3WGE T[3 'main loop 8Sj<,+XFq EnableTextPrinting( False ) C|TQf8 >{tn2Fkg> ypos = dety + pixely / 2 zdRVAcrwQ For i = 0 To ny - 1 tjb$MW$(' xpos = -detx - pixelx / 2 ]B=*p0~j^n ypos = ypos - pixely *YvtT(Gt w.(W G+ EnableTextPrinting( True ) uH%b rbrU Print i otR7E+*3 EnableTextPrinting( False ) IONo&~-l (4/"uj5 zdrP56rzZ For j = 0 To nx - 1 |xFA} nsU7cLf"^V xpos = xpos + pixelx aO&{.DO2 ISs&1`Y 'shift source f^B8!EY#: LockOperationUpdates srcnode, True s0f+AS|} GetOperation srcnode, 1, op ~^Cx->l op.val1 = xpos bXF8V op.val2 = ypos Kgr<OL}V J SetOperation srcnode, 1, op ZY`9 LockOperationUpdates srcnode, False q| 1%G Nb -EP1Rl`\ raytrace Su6kpC!EW DeleteRays )2?]c CreateSource srcnode Yu_*P-Ja6 TraceExisting 'draw y,x 2f%x pxTtV g. 'radiometry KJec/qca For k = 0 To GetEntityCount()-1 81{8F If IsSurface( k ) Then Twa(RjB< temp = AuxDataGetData( k, "temperature" ) l+"p$iZs emiss = AuxDataGetData( k, "emissivity" ) p7Wt(A If ( temp <> 0 And emiss <> 0 ) Then 6GunEYK!N8 ProjSolidAngleByPi = GetSurfIncidentPower( k ) [S,$E6&j$" frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) +\Jo^\ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 0q"4\#4l End If MSS[-} m_/Ut End If Tty'ysH q *&H Next k L.'61ZU qSr]d`7@ Next j :k1?I'q% q x)\{By Next i /e>%yq<9B EnableTextPrinting( True ) Q/]~`S 1*hE bO 'write out file j;`Q82V\ fullfilepath = CurDir() & "\" & fname S}JOS}\^j Open fullfilepath For Output As #1 TS6xF? Print #1, "GRID " & nx & " " & ny m)p|NdTZc8 Print #1, "1e+308" 2.%)OC!q&5 Print #1, pixelx & " " & pixely _{k*JT2 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 MQwxQ{ zb9G&'7 maxRow = nx - 1 RQ8d1US maxCol = ny - 1 vlkwWm For rowNum = 0 To maxRow ' begin loop over rows (constant X) xcW\U^1d row = "" K{DC{yLu For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ik(YJw'i7E row = row & irrad(colNum,rowNum) & " " ' append column data to row string p"%D/-%Gu Next colNum ' end loop over columns crb^TuN uxTgK'3 Print #1, row pmB
{b HfSx*@\s Next rowNum ' end loop over rows iuY,E Close #1 .ifz9jM' VNWB$mM.2 Print "File written: " & fullfilepath iZn0B5]ikj Print "All done!!" ^>l <)$s End Sub Mn
,hmIz 3XQa%|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: V>QyiB n3~axRPO bp9RF
d{ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 DW7E ]o
Q ")Xg: :%sBY0 yF 打开后,选择二维平面图: AA=Ob$2$ !2!Zhw2u
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