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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。 &| %<=\ ig:/60Z 成像示意图 c[]_gUp8 首先我们建立十字元件命名为Target D3V5GQ\=
Ev;HV}G 创建方法: gB@Xi* ~<Z;)e 面1 : @-bX[}. 面型:plane D<$~bUkxR 材料:Air `_sc_Y|C! 孔径:X=1.5, Y=6,Z=0.075,形状选择Box h+Km |
R6~x! T^u ][I3* 辅助数据: e2Sm.H ' 首先在第一行输入temperature :300K, Ed9ynJ~)X emissivity:0.1; b:/ ; }f np}L Vu '/o[nF> 面2 : U'zW; Lt 面型:plane {g}!M^| 材料:Air %3scz)4$ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box an^"_#8DA@ GHeJpS ~U`oew 位置坐标:绕Z轴旋转90度, 2yR*<yj 8;;!2>N ~\`lbGJ7? 辅助数据: mdvooJ cVJ"^wgBt 首先在第一行输入temperature :300K,emissivity: 0.1; ')t
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cr ZB GLwe Target 元件距离坐标原点-161mm; 4k_&Q?1 sfi.zuG 8*3o9$Pj 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Qk<W(
| 2BIAm] PHl{pE* 探测器参数设定:
RvKP& "l!WO`.zp= 在菜单栏中选择Create/Element Primitive /plane .GUm3b BJ!b LQ y:(OZ%g %`%oupqm+ SA&0f&07i /e :V44 元件半径为20mm*20,mm,距离坐标原点200mm。 A<l8CWv[ }r$&"wYM 光源创建: YO7Y1(` )z-)S 光源类型选择为任意平面,光源半角设定为15度。 0xrr9X< Kk1 591' J#vIzQ 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。 T%~w~stW $X8(OS5d' 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 j_*$Avy nf&PDv1 [
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hn[3 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。 qp_lMz b/'{6zn 创建分析面: 8uq^Q4SU AE`X4 q `s5<PCq 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。 CsHHJgx 2g~qVT, -SZXUN 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。 a5=8zO#%g <WFA3 FRED在探测器上穿过多个像素点迭代来创建热图 0+MNu8t k#Qav1_ 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。 ST$~l7p 将如下的代码放置在树形文件夹 Embedded Scripts, Jb~$Vrdy :8b{|}aYV T<(1)N1H` 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。 /aS= vjs Klfg:q:j+b 绿色字体为说明文字, 2Ya)I k{ NRu_6~^^ '#Language "WWB-COM" }5c%v1 'script for calculating thermal image map gU\pP,a 'edited rnp 4 november 2005 Yt&Isi
+ zQ3m@x 'declarations 68Po`_/s Dim op As T_OPERATION HS> (y2}' Dim trm As T_TRIMVOLUME V/|).YG2 Dim irrad(32,32) As Double 'make consistent with sampling n^aSio6 Dim temp As Double &
$E[l' Dim emiss As Double e??tp]PLn Dim fname As String, fullfilepath As String gGF]Dq "fK`F/ 'Option Explicit {gh41G;n MMlryn||1 Sub Main aT}Mn(F*? 'USER INPUTS nOq?Q nx = 31 gc(Gc vdB\ ny = 31 O~
a`T numRays = 1000 PdiP5S }/ minWave = 7 'microns pde,@0(Fa maxWave = 11 'microns \f| Hk*@ sigma = 5.67e-14 'watts/mm^2/deg k^4 sF9{(Us fname = "teapotimage.dat" W0e+yIaR %smQ`u| Print "" (Z:(f~; Print "THERMAL IMAGE CALCULATION" 2iOn\
^]x lGrp^ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 W\]bh'( S&/</% Print "found detector array at node " & detnode +m?;,JGt =&+]>g{T srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 oh*Hzb HI iMq'H^ Print "found differential detector area at node " & srcnode B
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R}WI GetTrimVolume detnode, trm 3OnIAk3 detx = trm.xSemiApe G!]%xFwYa dety = trm.ySemiApe h>Z NPP8N area = 4 * detx * dety )ph**g Print "detector array semiaperture dimensions are " & detx & " by " & dety 2P\k;T( Print "sampling is " & nx & " by " & ny 8yW 8F26 BR&T,x/d 'reset differential detector area dimensions to be consistent with sampling tG8)! pixelx = 2 * detx / nx '?| (QU:)F pixely = 2 * dety / ny pe^hOzVv SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Mc8|4/<Z Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 l^`& Tnzv H CBZ*Z- 'reset the source power jA'qXc+\ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) &d,chb( Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" $;O-1# ] _N`'R.va 'zero out irradiance array :LE0_ . For i = 0 To ny - 1 Q?"o.T'; For j = 0 To nx - 1 $~>3bik@ irrad(i,j) = 0.0 '8%pEl^ Next j #+VH]7] Next i 0!4;."S 7RXTQ9BS 'main loop \.0cA4)[$ EnableTextPrinting( False ) m(2(Caz{ NO$n-<ag ypos = dety + pixely / 2 GCrIaZ For i = 0 To ny - 1 2bJqZ,@ xpos = -detx - pixelx / 2 K)-Gv|*t ypos = ypos - pixely N=2BrKb)o ! z!lQ~ EnableTextPrinting( True ) l'yX_`*Iq Print i O$dcy! EnableTextPrinting( False ) )gX7qQ Tbf@qid e "zN2+X"& For j = 0 To nx - 1 j@w+>h =1!,A xpos = xpos + pixelx Vgh;w-a |AosZeO_ 'shift source Sf_q;Ws LockOperationUpdates srcnode, True 2/*F}w/ GetOperation srcnode, 1, op /6?A#%hc op.val1 = xpos } kNbqwVP op.val2 = ypos v~l_6V} SetOperation srcnode, 1, op n jfh4}g: LockOperationUpdates srcnode, False tQ:g#EqL9B A~2U9f+\ 'raytrace }JP0q DeleteRays ]1 V,_^D CreateSource srcnode q5Bj0r[/o TraceExisting 'draw MU
}<-1 {|R@\G.1( 'radiometry ujlIWQU2mo For k = 0 To GetEntityCount()-1 UU7E+4O& If IsSurface( k ) Then o+NPe36 temp = AuxDataGetData( k, "temperature" ) P4\{be>e emiss = AuxDataGetData( k, "emissivity" ) 8LI
aN} If ( temp <> 0 And emiss <> 0 ) Then 1q?b?. ProjSolidAngleByPi = GetSurfIncidentPower( k ) R04%;p:k# frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) g431+O0K1 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi y_s^dQe End If 2&e2/KEWR 2yB@)?V/ End If rNi]|)-ET |JUb 1|gi Next k U~;Rzoe)q* a{4Wg: Next j Fwu:x.( u~uR:E%'C Next i ZWtlO P#] EnableTextPrinting( True ) r8R]0\ >A]U.C 'write out file bF 85T(G fullfilepath = CurDir() & "\" & fname qdM=}lbc Open fullfilepath For Output As #1 xSf&*wLE Print #1, "GRID " & nx & " " & ny fXL&?~fS Print #1, "1e+308" !!{!T;)l Print #1, pixelx & " " & pixely 5B|&+7dCw Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 (f-Mm0%[ QNN*/n maxRow = nx - 1 B%]yLJ maxCol = ny - 1 IInsq For rowNum = 0 To maxRow ' begin loop over rows (constant X) 8\AyKw row = "" Mu1H*;_8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) tom1u>1n row = row & irrad(colNum,rowNum) & " " ' append column data to row string +#B4Z'nT Next colNum ' end loop over columns [Iwb7a0p 0h3-;% Print #1, row tny^sG/' hc2AGeZr Next rowNum ' end loop over rows $!'S7;*uW Close #1 W[$GB_A) 3d1$w Print "File written: " & fullfilepath Q5ZZ4`K! Print "All done!!" q7z;b A End Sub 0P+B-K>n `rwzCwA1 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: T#o?@; @|=JXSr!KY "X[sW%# F 找到Tools工具,点击Open plot files in 3D chart并找到该文件 EMTAl;P ?Nbc#0pb7 sy\w ^] 打开后,选择二维平面图: tc|`cB3f |}?o=bO
QQ:2987619807 Au=9<WB%H
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