| infotek |
2023-04-06 08:38 |
十字元件热成像分析
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。 <jRFN&"h} 5e/qgI)M5
成像示意图 fr'huvc 首先我们建立十字元件命名为Target ZH;y>Z 4$?wD < 创建方法:
InPy:} CEX}`I*- 面1 : JwI`"$>w 面型:plane 7Js>!KR 材料:Air V@f6Lj 孔径:X=1.5, Y=6,Z=0.075,形状选择Box E &];>3C sR>`QIi(a
Tn@UX(^, 辅助数据: hLyTUt~\L 首先在第一行输入temperature :300K, X@yr$3vC emissivity:0.1; aucZJjH 2-$bh uK;K{ 面2 : (!0j4' 面型:plane V{T{0b"\U 材料:Air $/, BJ/9 孔径:X=1.5, Y=6,Z=0.075,形状选择Box h5&/hBN SvX=isu!. &$b\= 位置坐标:绕Z轴旋转90度, 7ZV~op2Q p- "Z'$A`
42V,PH6o 辅助数据: /]/>jz> >&<<8Ln 首先在第一行输入temperature :300K,emissivity: 0.1; bSrRsgKvT |-(IJG#) yV J dZ I Target 元件距离坐标原点-161mm; pwFU2}I X!7VyE+n
q:Y6fbt<7 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 VDByj "% |RR%bQ^{ *%T)\\H2 探测器参数设定: cS D._"P #cj\~T.,, 在菜单栏中选择Create/Element Primitive /plane HDF!` ;m@1Ec@*p
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_#f5u ]a$Wxvgq =zeFK_S! 元件半径为20mm*20,mm,距离坐标原点200mm。 %s$rP /OQK/
t63 光源创建: U,Z"G1^ XYqpI/s 光源类型选择为任意平面,光源半角设定为15度。 [!1)mR QP6z?j. ]ZzoJ7lr 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ^Yj"RM$;N zVM4BT( 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。 ds*m6#1b ,c4c@|Bh? R*s* +I 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。 U/T4i# t6'61*)|0 创建分析面: DE*MdfP0 c%|vUAq* J0^{,eY< 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。 Y]C;T nK+lE0
n?'d|h 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。 #/OUGeJ 28nmQ FRED在探测器上穿过多个像素点迭代来创建热图 rkxW UDl #F_'}?09% 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。 9<xTu>7J 将如下的代码放置在树形文件夹 Embedded Scripts, jja{*PZ6H {5T0RL{\N
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fS~ 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。 QJx9I_ ?22d},. 绿色字体为说明文字, f?,-j>[.=f *;<e
'[Y7f '#Language "WWB-COM" YecT 96% 'script for calculating thermal image map C&=x3Cz 'edited rnp 4 november 2005 ecn}iN mO#I nTO 'declarations +'-rTi\ Dim op As T_OPERATION A#<vG1 Dim trm As T_TRIMVOLUME |y.zocBj Dim irrad(32,32) As Double 'make consistent with sampling <5dH *K Dim temp As Double I0!j<G Dim emiss As Double M]c7D`%s Dim fname As String, fullfilepath As String e#tIk;9Xz m7JPH7P@BM 'Option Explicit /:U1!9.y _3|6ZO Sub Main 8KFj<N>' 'USER INPUTS '<TD6jBs nx = 31 7'Lp8 ny = 31 VsEGX@;tO numRays = 1000 UmJUt| minWave = 7 'microns &GuF\wJ{7 maxWave = 11 'microns SaCx)8ul0 sigma = 5.67e-14 'watts/mm^2/deg k^4 d7E7f fname = "teapotimage.dat" L^lS^P 't7Z] G Print "" */nuv
k Print "THERMAL IMAGE CALCULATION" (#oYyM] :AZp} detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 A^-iHm Yt{ji Print "found detector array at node " & detnode h6g:(3t6m H"_v+N5= srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 a2o.a2
Vc| NL^ Print "found differential detector area at node " & srcnode N r<9u$d9= W,Ty=:qm* GetTrimVolume detnode, trm q-YL]PgV detx = trm.xSemiApe ZPlPN;J^1 dety = trm.ySemiApe NEMEY7De2 area = 4 * detx * dety bhYU5I 9 Print "detector array semiaperture dimensions are " & detx & " by " & dety }wfI4?}j} Print "sampling is " & nx & " by " & ny 5C B%=iL{ I] jX7.fx 'reset differential detector area dimensions to be consistent with sampling 8)pB_en3sO pixelx = 2 * detx / nx PcB{=L pixely = 2 * dety / ny k d+l k: SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 7aQn; Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 gGI8t@t: ,ijW(95{k 'reset the source power
DwXU SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) !N1J@LT5h Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" (xL
:; Oxv+1Ub<Dv 'zero out irradiance array =5ug\S For i = 0 To ny - 1 2SciB*5 For j = 0 To nx - 1 ;,rnk- irrad(i,j) = 0.0 OF8WDo` Next j &$F[/[Ds+ Next i 6 Uw;C84! Jn*Nao_) 'main loop 9`BEi(z EnableTextPrinting( False ) %K?iNe wu 2:'y>n ypos = dety + pixely / 2 b/nOdFO@ For i = 0 To ny - 1 K_>/lirE? xpos = -detx - pixelx / 2 333u] ypos = ypos - pixely !!WJn} ra:GzkIw EnableTextPrinting( True ) )|RZa|`-G Print i -L8YJ8J6 EnableTextPrinting( False ) :_Fxy5} x%6hM|U Fc'[+L--Q For j = 0 To nx - 1 P>wZ~Hjk {2:d`fqD xpos = xpos + pixelx W`x)=y]Z C_G1P)k 'shift source e!Br>^8l LockOperationUpdates srcnode, True ~KRnr0 GetOperation srcnode, 1, op #ZlM?Q op.val1 = xpos >A($8=+#x op.val2 = ypos \f"1}f SetOperation srcnode, 1, op -NzTqLBn LockOperationUpdates srcnode, False fK_~lGY( f=m/
-mAA 'raytrace 9|=nV|R'6 DeleteRays {y6C0A* CreateSource srcnode dE [Ol TraceExisting 'draw H)5QqZ8 ltSh'w0 'radiometry y]'CXCml) For k = 0 To GetEntityCount()-1 .S_QQM}Q If IsSurface( k ) Then B{aU;{1 temp = AuxDataGetData( k, "temperature" ) yp+F<5o emiss = AuxDataGetData( k, "emissivity" ) X+iK<F$ If ( temp <> 0 And emiss <> 0 ) Then 0`n
5x0R ProjSolidAngleByPi = GetSurfIncidentPower( k ) nU17L6'$ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) }g{_AiP
rv irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi c~+l-GIWm End If GV8)Kor% J3=BE2L End If Dm%%e o GNU;jSh5 Next k i&&qbZt 2~FPw{]j Next j HO5d%85 ET-Vm >] Next i 6Z8l8:r-6 EnableTextPrinting( True ) Qq3fZ= K-(;D4/sQE 'write out file cZi[(K fullfilepath = CurDir() & "\" & fname 3cC }'j Open fullfilepath For Output As #1 9j#@p Print #1, "GRID " & nx & " " & ny kcS6 _l Print #1, "1e+308" /9_#U#vhY Print #1, pixelx & " " & pixely T~J?AKx Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 >nry0 ;z0, ]XUSqai maxRow = nx - 1 |zpx)8Q maxCol = ny - 1 S$O,] @) For rowNum = 0 To maxRow ' begin loop over rows (constant X) ~/|zlu*jpc row = "" V;93).-$ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) H/J<Pd$p row = row & irrad(colNum,rowNum) & " " ' append column data to row string K@r*;T Next colNum ' end loop over columns Y6ben7j%- =M<z8R Print #1, row lIh[|] 9=$!gC) Next rowNum ' end loop over rows =.b Y#4 Close #1 7lU.Nit q#vlBL Print "File written: " & fullfilepath SRCOs1(EK9 Print "All done!!" Jqru AW< End Sub ~ E *d G &p"(- 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: I7mG/ s'L?;:)dyB CgnXr/!L 找到Tools工具,点击Open plot files in 3D chart并找到该文件 y $V[_TN mP-2s;q h\y-L~2E 打开后,选择二维平面图: FT/amCRyT aws"3O%
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